blocks|key|7944|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|7945|[[UINavigationBar+appearance]+setBackgroundImage:+[UIImage+new]++
+++++++++++++++++++++++++++++++++++forBarMetrics:+UIBarMetricsDefault];

[UINavigationBar+appearance].shadowImage+=+[UIImage+new];|code-block|syntax|javascript|7946|下图有说明(iOS7+NavigationBar)：|7947|​|7948|📷|atomic|offset|length|7949|7950|然后检查这个SO问题：iOS7+-+Change+UINavigationBar+border+color|7951|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/4b7052cc555e1eb43f1df47da9bf7344.png|imageAlt|1|LINK|MUTABLE|url|https://stackoverflow.com/questions/19101361/ios7-change-uinavigationbar-border-color/19102809#19102809^0|0|0|0|0|0|1|0|0|0|B|16|1|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1A|8|@]|9|@$N|1B|O|1C|1|1D]]|A|$]]|$1|P|3|J|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@$N|1G|O|1H|1|1I]]|A|$]]|$1|S|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]|11|$5|12|W|13|A|$14|15]]]]

Try this:

<pre><code>[[UINavigationBar appearance] setBackgroundImage: [UIImage new] 
 forBarMetrics: UIBarMetricsDefault];

[UINavigationBar appearance].shadowImage = [UIImage new];
</code></pre>

Below image has the explanation (iOS7 NavigationBar):

<img src="https://i.stack.imgur.com/FrQi3.png" alt="enter image description here">

And check this SO question:
<a href="https://stackoverflow.com/questions/19101361/ios7-change-uinavigationbar-border-color/19102809#19102809">iOS7 - Change UINavigationBar border color</a>

blocks|key|7988|text|如果您只想使用纯色导航栏颜色，并且已在情节提要中对其进行了设置，请在AppDelegate类中使用此代码通过外观代理删除1像素边框：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|7989|[[UINavigationBar+appearance]+setBackgroundImage:[[UIImage+alloc]+init]
++++++++++++++++++++++++++++++++++forBarPosition:UIBarPositionAny
++++++++++++++++++++++++++++++++++++++barMetrics:UIBarMetricsDefault];

[[UINavigationBar+appearance]+setShadowImage:[[UIImage+alloc]+init]];|code-block|syntax|javascript|7990|entityMap^0|Y|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you just want to use a solid navigation bar color and have set this up in your storyboard, use this code in your <code>AppDelegate</code> class to remove the 1 pixel border via the appearance proxy:

<pre><code>[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init]
 forBarPosition:UIBarPositionAny
 barMetrics:UIBarMetricsDefault];

[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];
</code></pre>

blocks|key|8005|text|设置背景图像的问题是它消除了模糊。您可以在不设置背景图像的情况下将其删除。请参阅我的答案here。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|8006|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/19038487/983912^0|18|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The problem with setting a background image is it removes blurring. You can remove it without setting a background image. See my answer <a href="https://stackoverflow.com/a/19038487/983912">here</a>.

blocks|key|8018|text|在研究了Serhil的答案之后，我创建了一个pod+UINavigationBar%2BAddition，它可以很容易地隐藏发际线。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|8019|#import+"UINavigationBar%2BAddition.h"

-+(void)viewDidLoad+{
++++[super+viewDidLoad];

++++UINavigationBar+*navigationBar+=+self.navigationController.navigationBar;
++++[navigationBar+hideBottomHairline];
}|code-block|syntax|javascript|8020|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/samwize/UINavigationBar-Addition/^0|Q|O|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

After studying the answer from Serhil, I created a pod <a href="https://github.com/samwize/UINavigationBar-Addition/">UINavigationBar+Addition</a> that can easily hide the hairline.

<pre><code>#import "UINavigationBar+Addition.h"

- (void)viewDidLoad {
 [super viewDidLoad];

 UINavigationBar *navigationBar = self.navigationController.navigationBar;
 [navigationBar hideBottomHairline];
}
</code></pre>

blocks|key|8079|text|我知道这是一个古老的主题，但我找到了一个非常有效的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8080|子类UINavigationBar。在UINavigationBar子类中，使用以下代码覆盖didAddSubview：|8081|-+(void)didAddSubview:(UIView+*)subview
{
++++[super+didAddSubview:subview];

++++if+([subview+isKindOfClass:[UIImageView+class]])+{
++++++++[subview+setClipsToBounds:YES];
++++}
}|code-block|syntax|javascript|8082|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know this is an old thread, but I found a solution that works really well:

Subclass UINavigationBar.
In your UINavigationBar subclass, override didAddSubview with the following code:

<pre><code>- (void)didAddSubview:(UIView *)subview
{
 [super didAddSubview:subview];

 if ([subview isKindOfClass:[UIImageView class]]) {
 [subview setClipsToBounds:YES];
 }
}
</code></pre>

blocks|key|8113|text|我想添加Swift版本的Serhii的答案。我创建了一个包含以下内容的UIBarExtension.swift：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|8114|import+Foundation
import+UIKit

extension+UINavigationBar+{
++++func+hideBottomHairline()+{
++++++++self.hairlineImageView?.isHidden+=+true
++++}

++++func+showBottomHairline()+{
++++++++self.hairlineImageView?.isHidden+=+false
++++}
}

extension+UIToolbar+{
++++func+hideBottomHairline()+{
++++++++self.hairlineImageView?.isHidden+=+true
++++}

++++func+showBottomHairline()+{
++++++++self.hairlineImageView?.isHidden+=+false
++++}
}

extension+UIView+{
++++fileprivate+var+hairlineImageView:+UIImageView?+{
++++++++return+hairlineImageView(in:+self)
++++}

++++fileprivate+func+hairlineImageView(in+view:+UIView)+->+UIImageView?+{
++++++++if+let+imageView+=+view+as?+UIImageView,+imageView.bounds.height+<=+1.0+{
++++++++++++return+imageView
++++++++}

++++++++for+subview+in+view.subviews+{
++++++++++++if+let+imageView+=+self.hairlineImageView(in:+subview)+{+return+imageView+}
++++++++}

++++++++return+nil
++++}
}|code-block|syntax|javascript|8115|entityMap^0|Z|K|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Wanted to add the Swift version of Serhii's answer. I created a <code>UIBarExtension.swift</code> with the following:

<pre><code>import Foundation
import UIKit

extension UINavigationBar {
 func hideBottomHairline() {
 self.hairlineImageView?.isHidden = true
 }

 func showBottomHairline() {
 self.hairlineImageView?.isHidden = false
 }
}

extension UIToolbar {
 func hideBottomHairline() {
 self.hairlineImageView?.isHidden = true
 }

 func showBottomHairline() {
 self.hairlineImageView?.isHidden = false
 }
}

extension UIView {
 fileprivate var hairlineImageView: UIImageView? {
 return hairlineImageView(in: self)
 }

 fileprivate func hairlineImageView(in view: UIView) -&gt; UIImageView? {
 if let imageView = view as? UIImageView, imageView.bounds.height &lt;= 1.0 {
 return imageView
 }

 for subview in view.subviews {
 if let imageView = self.hairlineImageView(in: subview) { return imageView }
 }

 return nil
 }
}
</code></pre>

blocks|key|224719|text|如果你想保留半透明效果，又不想在你的应用中继承每个UINavigationController，那就是另一个选择：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|224720|#import+<objc/runtime.h>

@implementation+UINavigationController+(NoShadow)

%2B+(void)load+{
++++Method+original+=+class_getInstanceMethod(self,+@selector(viewWillAppear:));
++++Method+swizzled+=+class_getInstanceMethod(self,+@selector(swizzled_viewWillAppear:));
++++method_exchangeImplementations(original,+swizzled);
}

%2B+(UIImageView+*)findHairlineImageViewUnder:(UIView+*)view+{
++++if+([view+isKindOfClass:UIImageView.class]+&&+view.bounds.size.height+<=+1.0)+{
++++++++return+(UIImageView+*)view;
++++}

++++for+(UIView+*subview+in+view.subviews)+{
++++++++UIImageView+*imageView+=+[self+findHairlineImageViewUnder:subview];
++++++++if+(imageView)+{
++++++++++++return+imageView;
++++++++}
++++}

++++return+nil;
}

-+(void)swizzled_viewWillAppear:(BOOL)animated+{
++++UIImageView+*shadow+=+[UINavigationController+findHairlineImageViewUnder:self.navigationBar];
++++shadow.hidden+=+YES;

++++[self+swizzled_viewWillAppear:animated];
}

@end|code-block|syntax|javascript|224721|entityMap^0|P|M|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Another option if you want to preserve translucency and you don't want to subclass every <code>UINavigationController</code> in your app:

<pre><code>#import &lt;objc/runtime.h&gt;

@implementation UINavigationController (NoShadow)

+ (void)load {
 Method original = class_getInstanceMethod(self, @selector(viewWillAppear:));
 Method swizzled = class_getInstanceMethod(self, @selector(swizzled_viewWillAppear:));
 method_exchangeImplementations(original, swizzled);
}

+ (UIImageView *)findHairlineImageViewUnder:(UIView *)view {
 if ([view isKindOfClass:UIImageView.class] &amp;&amp; view.bounds.size.height &lt;= 1.0) {
 return (UIImageView *)view;
 }

 for (UIView *subview in view.subviews) {
 UIImageView *imageView = [self findHairlineImageViewUnder:subview];
 if (imageView) {
 return imageView;
 }
 }

 return nil;
}

- (void)swizzled_viewWillAppear:(BOOL)animated {
 UIImageView *shadow = [UINavigationController findHairlineImageViewUnder:self.navigationBar];
 shadow.hidden = YES;

 [self swizzled_viewWillAppear:animated];
}

@end
</code></pre>

blocks|key|8236|text|[tabviewController.view+setBackgroundColor:[UIColor+blackColor]];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|8237|为我做的[UIColor+blackColor]可能是你的背景色，如果你正在使用，tabviewController是你的UITabBarController！|unstyled|offset|length|style|CODE|8238|entityMap^0|0|4|K|15|H|1P|I|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]|$G|Q|H|R|I|J]|$G|S|H|T|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|U|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>[tabviewController.view setBackgroundColor:[UIColor blackColor]];
</code></pre>

Did it for me <code>[UIColor blackColor]</code> might be your background color,
and <code>tabviewController</code> is your <code>UITabBarController</code> if you are using it!

blocks|key|224798|text|这里有一个非常简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224799|self.navigationController.navigationBar.clipsToBounds+=+YES;|code-block|syntax|javascript|224800|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a very simple solution:

<pre><code>self.navigationController.navigationBar.clipsToBounds = YES;
</code></pre>

blocks|key|8261|text|Slightly+Swift+Solution+
func+setGlobalAppearanceCharacteristics+()+{
++++let+navigationBarAppearace+=+UINavigationBar.appearance()
++++navigationBarAppearace.tintColor+=+UIColor.white
++++navigationBarAppearace.barTintColor+=+UIColor.blue
++++navigationBarAppearace.setBackgroundImage(UIImage(),+for:+UIBarMetrics.default)
++++navigationBarAppearace.shadowImage+=+UIImage()

}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|8262|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Slightly Swift Solution 
func setGlobalAppearanceCharacteristics () {
 let navigationBarAppearace = UINavigationBar.appearance()
 navigationBarAppearace.tintColor = UIColor.white
 navigationBarAppearace.barTintColor = UIColor.blue
 navigationBarAppearace.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
 navigationBarAppearace.shadowImage = UIImage()

}
</code></pre>

blocks|key|8287|text|做到这一点的快速方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8288|UINavigationBar.appearance().setBackgroundImage(UIImage(),+for:+.any,+barMetrics:+.default)
UINavigationBar.appearance().shadowImage+=+UIImage()|code-block|syntax|javascript|8289|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The swift way to do it:
<pre><code>UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .any, barMetrics: .default)
UINavigationBar.appearance().shadowImage = UIImage()
</code></pre>

blocks|key|8302|text|我的方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8303|UINavigationBar.appearance().setBackgroundImage(
++++++++++++UIImage(),
++++++++++++forBarPosition:+.Any,
++++++++++++barMetrics:+.Default)
++++var+_width:CGFloat!+=+self.navigationController?.navigationBar.layer.frame.width
++++++++++++var+_height:CGFloat!+=+self.navigationController?.navigationBar.layer.frame.height
++++++++++++var+navBarBg+=+UIView(frame:CGRectMake(0,+0,+_width,+_height))
++++++++++++//solid+color+for+bg
++++++++++++navBarBg.backgroundColor+=+UIColor.orangeColor()
++++++++++++view.addSubview(navBarBg)|code-block|syntax|javascript|8304|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

My approach:

<pre><code>UINavigationBar.appearance().setBackgroundImage(
 UIImage(),
 forBarPosition: .Any,
 barMetrics: .Default)
 var _width:CGFloat! = self.navigationController?.navigationBar.layer.frame.width
 var _height:CGFloat! = self.navigationController?.navigationBar.layer.frame.height
 var navBarBg = UIView(frame:CGRectMake(0, 0, _width, _height))
 //solid color for bg
 navBarBg.backgroundColor = UIColor.orangeColor()
 view.addSubview(navBarBg)
</code></pre>

blocks|key|8332|text|针对Swift+2.0更新的pxpgraphics'+solution|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|8333|extension+UINavigationBar+{

++++func+hideBottomHairline()
++++{
++++++++hairlineImageViewInNavigationBar(self)?.hidden+=+true
++++}

++++func+showBottomHairline()
++++{
++++++++hairlineImageViewInNavigationBar(self)?.hidden+=+false
++++}

++++private+func+hairlineImageViewInNavigationBar(view:+UIView)+->+UIImageView?
++++{
++++++++if+let+imageView+=+view+as?+UIImageView+where+imageView.bounds.height+<=+1
++++++++{
++++++++++++return+imageView
++++++++}

++++++++for+subview:+UIView+in+view.subviews
++++++++{
++++++++++++if+let+imageView+=+hairlineImageViewInNavigationBar(subview)
++++++++++++{
++++++++++++++++return+imageView
++++++++++++}
++++++++}

++++++++return+nil
++++}

}

extension+UIToolbar
{

++++func+hideHairline()
++++{
++++++++let+navigationBarImageView+=+hairlineImageViewInToolbar(self)?.hidden+=+true
++++}

++++func+showHairline()
++++{
++++++++let+navigationBarImageView+=+hairlineImageViewInToolbar(self)?.hidden+=+false
++++}

++++private+func+hairlineImageViewInToolbar(view:+UIView)+->+UIImageView?
++++{
++++++++if+let+imageView+=+view+as?+UIImageView+where+imageView.bounds.height+<=+1
++++++++{
++++++++++++return+imageView
++++++++}

++++++++for+subview:+UIView+in+view.subviews
++++++++{
++++++++++++if+let+imageView+=+hairlineImageViewInToolbar(subview)
++++++++++++{
++++++++++++++++return+imageView
++++++++++++}
++++++++}

++++++++return+nil
++++}

}|code-block|syntax|javascript|8334|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/24974907/2452039^0|E|L|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<a href="https://stackoverflow.com/a/24974907/2452039" title="pxpgraphics&#39; solution">pxpgraphics' solution</a> updated for Swift 2.0

<pre><code>extension UINavigationBar {

 func hideBottomHairline()
 {
 hairlineImageViewInNavigationBar(self)?.hidden = true
 }

 func showBottomHairline()
 {
 hairlineImageViewInNavigationBar(self)?.hidden = false
 }

 private func hairlineImageViewInNavigationBar(view: UIView) -&gt; UIImageView?
 {
 if let imageView = view as? UIImageView where imageView.bounds.height &lt;= 1
 {
 return imageView
 }

 for subview: UIView in view.subviews
 {
 if let imageView = hairlineImageViewInNavigationBar(subview)
 {
 return imageView
 }
 }

 return nil
 }

}

extension UIToolbar
{

 func hideHairline()
 {
 let navigationBarImageView = hairlineImageViewInToolbar(self)?.hidden = true
 }

 func showHairline()
 {
 let navigationBarImageView = hairlineImageViewInToolbar(self)?.hidden = false
 }

 private func hairlineImageViewInToolbar(view: UIView) -&gt; UIImageView?
 {
 if let imageView = view as? UIImageView where imageView.bounds.height &lt;= 1
 {
 return imageView
 }

 for subview: UIView in view.subviews
 {
 if let imageView = hairlineImageViewInToolbar(subview)
 {
 return imageView
 }
 }

 return nil
 }

}
</code></pre>

blocks|key|8368|text|我刚刚为这个创建了一个扩展...很抱歉格式化(这是我的第一个答案)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8369|用法：|8370|++override+func+viewDidLoad()+{
++++super.viewDidLoad()
++++self.navigationController?.hideShadow+=+true
}|code-block|syntax|javascript|8371|扩展名：|8372|+UINavigationController.swift
//++Created+by+Ricardo+López+Rey+on+16/7/15.

import+Foundation


struct+UINavigationControllerExtension+{
++++static+var+hideShadowKey+:+String+=+"HideShadow"
static+let+backColor+=+UIColor(red:+247/255,+green:+247/255,+blue:+248/255,+alpha:+1.0)
}

extension+UINavigationController+{

++++var+hideShadow+:+Bool+{
++++++++get+{
++++++++++++if+let+ret+=++objc_getAssociatedObject(self,+&UINavigationControllerExtension.hideShadowKey)+as?+Bool+{
++++++++++++++++return+ret
++++++++++++}+else+{
++++++++++++++++return+false
++++++++++++}


++++++++}
++++++++set+{
++++++++++++objc_setAssociatedObject(self,&UINavigationControllerExtension.hideShadowKey,newValue,+objc_AssociationPolicy(OBJC_ASSOCIATION_RETAIN_NONATOMIC))

++++++++++++if+newValue+{


++++++++++++self.navigationBar.setBackgroundImage(solidImage(UINavigationControllerExtension.backColor),+forBarMetrics:+UIBarMetrics.Default)

++++++++++++++++self.navigationBar.shadowImage+=+solidImage(UIColor.clearColor())
++++++++++++}+else+{
++++++++++++++++self.navigationBar.setBackgroundImage(nil,+forBarMetrics:+UIBarMetrics.Default)
++++++++++++}
++++++++}
++++}

++++private+func+solidImage(color:+UIColor,+size:+CGSize+=+CGSize(width:+1,height:+1))+->+UIImage+{
++++++++var+rect+=+CGRectMake(0,+0,+size.width,+size.height)
++++++++UIGraphicsBeginImageContextWithOptions(size,+false,+0)
++++++++color.setFill()
++++++++UIRectFill(rect)
++++++++var+image:+UIImage+=+UIGraphicsGetImageFromCurrentImageContext()
++++++++UIGraphicsEndImageContext()
++++++++return+image
++++}


}|8373|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I Just created an extension for this... Sorry about formatting (this is my first answer).

Usage: 

<pre><code> override func viewDidLoad() {
 super.viewDidLoad()
 self.navigationController?.hideShadow = true
}
</code></pre>

Extension: 

<pre><code> UINavigationController.swift
// Created by Ricardo López Rey on 16/7/15.

import Foundation


struct UINavigationControllerExtension {
 static var hideShadowKey : String = "HideShadow"
static let backColor = UIColor(red: 247/255, green: 247/255, blue: 248/255, alpha: 1.0)
}

extension UINavigationController {

 var hideShadow : Bool {
 get {
 if let ret = objc_getAssociatedObject(self, &amp;UINavigationControllerExtension.hideShadowKey) as? Bool {
 return ret
 } else {
 return false
 }


 }
 set {
 objc_setAssociatedObject(self,&amp;UINavigationControllerExtension.hideShadowKey,newValue, objc_AssociationPolicy(OBJC_ASSOCIATION_RETAIN_NONATOMIC))

 if newValue {


 self.navigationBar.setBackgroundImage(solidImage(UINavigationControllerExtension.backColor), forBarMetrics: UIBarMetrics.Default)

 self.navigationBar.shadowImage = solidImage(UIColor.clearColor())
 } else {
 self.navigationBar.setBackgroundImage(nil, forBarMetrics: UIBarMetrics.Default)
 }
 }
 }

 private func solidImage(color: UIColor, size: CGSize = CGSize(width: 1,height: 1)) -&gt; UIImage {
 var rect = CGRectMake(0, 0, size.width, size.height)
 UIGraphicsBeginImageContextWithOptions(size, false, 0)
 color.setFill()
 UIRectFill(rect)
 var image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
 UIGraphicsEndImageContext()
 return image
 }


}
</code></pre>

blocks|key|224951|text|在iOS8中，如果将UINavigationBar.barStyle设置为.Black，则可以将条形图的背景设置为不带边框的纯色。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|224952|在Swift中：|224953|UINavigationBar.appearance().translucent+=+false
UINavigationBar.appearance().barStyle+=+UIBarStyle.Black
UINavigationBar.appearance().barTintColor+=+UIColor.redColor()|code-block|syntax|javascript|224954|entityMap^0|A|O|11|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

In iOS8, if you set the <code>UINavigationBar.barStyle</code> to <code>.Black</code> you can set the bar's background as plain color without the border. 

In Swift:

<pre><code>UINavigationBar.appearance().translucent = false
UINavigationBar.appearance().barStyle = UIBarStyle.Black
UINavigationBar.appearance().barTintColor = UIColor.redColor()
</code></pre>

blocks|key|8452|text|我使用了一个UINavigationBar扩展，它允许我使用Storyboard+(或源代码)来隐藏/显示该阴影，或者使用Storyboard(或源代码)选择哪个导航栏必须隐藏/显示该阴影。下面是扩展名：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8453|import+UIKit

private+var+flatAssociatedObjectKey:+UInt8+=+0

/*
++An+extension+that+adds+a+"flat"+field+to+UINavigationBar.+This+flag,+when
++enabled,+removes+the+shadow+under+the+navigation+bar.
+*/
@IBDesignable+extension+UINavigationBar+{
++++@IBInspectable+var+flat:+Bool+{
++++++++get+{
++++++++++++guard+let+obj+=+objc_getAssociatedObject(self,+&flatAssociatedObjectKey)+as?+NSNumber+else+{
++++++++++++++++return+false
++++++++++++}
++++++++++++return+obj.boolValue;
++++++++}

++++++++set+{
++++++++++++if+(newValue)+{
++++++++++++++++let+void+=+UIImage()
++++++++++++++++setBackgroundImage(void,+forBarPosition:+.Any,+barMetrics:+.Default)
++++++++++++++++shadowImage+=+void
++++++++++++}+else+{
++++++++++++++++setBackgroundImage(nil,+forBarPosition:+.Any,+barMetrics:+.Default)
++++++++++++++++shadowImage+=+nil
++++++++++++}
++++++++++++objc_setAssociatedObject(self,+&flatAssociatedObjectKey,+NSNumber(bool:+newValue),
++++++++++++++++++++objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
++++++++}
++++}
}|code-block|syntax|javascript|8454|现在，要禁用所有导航栏中的阴影，您必须使用：|8455|UINavigationBar.appearance().flat+=+true|8456|或者，可以使用情节提要启用/禁用此行为：|8457|​|8458|📷|atomic|offset|length|8459|8460|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c3bbed4e5534c6331d1ddd953c581a0b.jpeg|imageAlt^0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|18|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|19|8|@]|9|@$R|1A|S|1B|1|1C]]|A|$]]|$1|T|3|N|5|6|7|1D|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11|12|-4]]]]

I use a UINavigationBar extension that enables me to hide/show that shadow using the UIAppearance API or selecting which navigation bar has to hide/show that shadow using Storyboard (or source code). Here is the extension:

<pre><code>import UIKit

private var flatAssociatedObjectKey: UInt8 = 0

/*
 An extension that adds a "flat" field to UINavigationBar. This flag, when
 enabled, removes the shadow under the navigation bar.
 */
@IBDesignable extension UINavigationBar {
 @IBInspectable var flat: Bool {
 get {
 guard let obj = objc_getAssociatedObject(self, &amp;flatAssociatedObjectKey) as? NSNumber else {
 return false
 }
 return obj.boolValue;
 }

 set {
 if (newValue) {
 let void = UIImage()
 setBackgroundImage(void, forBarPosition: .Any, barMetrics: .Default)
 shadowImage = void
 } else {
 setBackgroundImage(nil, forBarPosition: .Any, barMetrics: .Default)
 shadowImage = nil
 }
 objc_setAssociatedObject(self, &amp;flatAssociatedObjectKey, NSNumber(bool: newValue),
 objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
 }
 }
}
</code></pre>

Now, to disable the shadow across all navigation bars you have to use:

<pre><code>UINavigationBar.appearance().flat = true
</code></pre>

Or you can enable/disable this behavior using storyboards:

<a href="https://i.stack.imgur.com/99c32.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/99c32.jpg" alt="Navigation Bar Storyboard"></a>

blocks|key|225047|text|这是另一个选择--我认为只有当你的导航栏不需要半透明的时候才有效(我没有)。我刚刚在导航栏的底部添加了一个1像素高的UIView+(在导航栏下面1个像素)，颜色与我的导航栏相同：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225048|UIView+*view+=+[[UIView+alloc]+init];
[view+setBackgroundColor:self.navigationController.navigationBar.barTintColor];
[self.navigationController.navigationBar+addSubview:view];
[view+mas_makeConstraints:%5E(MASConstraintMaker+*make)+{
++++make.height.equalTo(@(1.0f));
++++make.leading.trailing.equalTo(self.navigationController.navigationBar);
++++make.bottom.equalTo(self.navigationController.navigationBar).offset(1.0f);
}];|code-block|syntax|javascript|225049|我正在使用Masonry添加约束。|225050|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here's another option - I think this only works if you don't require translucency on your nav bar (I didn't). I just added a 1 pixel high UIView to the bottom of the nav bar (1 pixel below the nav bar) with the same colour as my nav bar:

<pre><code>UIView *view = [[UIView alloc] init];
[view setBackgroundColor:self.navigationController.navigationBar.barTintColor];
[self.navigationController.navigationBar addSubview:view];
[view mas_makeConstraints:^(MASConstraintMaker *make) {
 make.height.equalTo(@(1.0f));
 make.leading.trailing.equalTo(self.navigationController.navigationBar);
 make.bottom.equalTo(self.navigationController.navigationBar).offset(1.0f);
}];
</code></pre>

I'm adding the constraints using Masonry.

blocks|key|8539|text|swift中的简单解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8540|+++let+navigationBar+=+self.navigationController?.navigationBar
++++navigationBar?.setBackgroundImage(UIImage(),+forBarPosition:+UIBarPosition.Any,+barMetrics:+UIBarMetrics.Default)
++++navigationBar?.shadowImage+=+UIImage()|code-block|syntax|javascript|8541|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Simple solution in swift

<pre><code> let navigationBar = self.navigationController?.navigationBar
 navigationBar?.setBackgroundImage(UIImage(), forBarPosition: UIBarPosition.Any, barMetrics: UIBarMetrics.Default)
 navigationBar?.shadowImage = UIImage()
</code></pre>

blocks|key|8559|text|酒吧风格的黑色为我做了这一切。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8560|[[UINavigationBar+appearance]+setBarStyle:UIBarStyleBlack];|code-block|syntax|javascript|8561|我拥有的所有属性(以防万一)：|8562|++++[[UINavigationBar+appearance]+setBarTintColor:color];
++++[[UINavigationBar+appearance]+setTranslucent:NO];
++++[[UINavigationBar+appearance]+setShadowImage:[UIImage+new]];
++++[[UINavigationBar+appearance]+setBarStyle:UIBarStyleBlack];|8563|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Bar style black did it for me.

<pre><code>[[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
</code></pre>

All properties that I have (just in case):

<pre><code> [[UINavigationBar appearance] setBarTintColor:color];
 [[UINavigationBar appearance] setTranslucent:NO];
 [[UINavigationBar appearance] setShadowImage:[UIImage new]];
 [[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
</code></pre>

blocks|key|225201|text|斯威夫特把这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225202|UINavigationBar.appearance().setBackgroundImage(UIImage(),+forBarPosition:+.Any,+barMetrics:+.Default)
UINavigationBar.appearance().shadowImage+=+UIImage()|code-block|syntax|javascript|225203|在……里面|225204|func+application(application:+UIApplication,+didFinishLaunchingWithOptions+launchOptions:+[NSObject:+AnyObject]?)+->+Bool|225205|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift put this 

<pre><code>UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarPosition: .Any, barMetrics: .Default)
UINavigationBar.appearance().shadowImage = UIImage()
</code></pre>

in 

<pre><code>func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool
</code></pre>

blocks|key|8623|text|-(void)viewWillAppear:(BOOL)animated+{
++++[super+viewWillAppear:animated];

++++UIImage+*emptyImage+=+[UIImage+new];
++++self.navigationController.navigationBar.shadowImage+=+emptyImage;
++++[self.navigationController.navigationBar+setBackgroundImage:emptyImage+forBarMetrics:UIBarMetricsDefault];
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|8624|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>-(void)viewWillAppear:(BOOL)animated {
 [super viewWillAppear:animated];

 UIImage *emptyImage = [UIImage new];
 self.navigationController.navigationBar.shadowImage = emptyImage;
 [self.navigationController.navigationBar setBackgroundImage:emptyImage forBarMetrics:UIBarMetricsDefault];
}
</code></pre>

blocks|key|8685|text|对我来说起作用的，也是最简单的，是创建一个具有所需颜色的png+(它只需要一个像素乘以一个像素)，然后设置backgroundImage和shadowImage：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8686|let+greenPixel+=+UIImage(named:+"TheNameOfYourPng")
navigationBar.setBackgroundImage(greenPixel,+forBarMetrics:+UIBarMetrics.Default)
navigationBar.shadowImage+=+greenPixel|code-block|syntax|javascript|8687|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

What worked for me, and was simplest, was to create a png (it only needs to be one pixel by one pixel in dimensions) with the required color and then set the backgroundImage and shadowImage to that:

<pre><code>let greenPixel = UIImage(named: "TheNameOfYourPng")
navigationBar.setBackgroundImage(greenPixel, forBarMetrics: UIBarMetrics.Default)
navigationBar.shadowImage = greenPixel
</code></pre>

blocks|key|8699|text|在子视图中查找发际线的一个很好的简短Swift函数是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8700|+func+findHairLineInImageViewUnder(view+view:+UIView)+->+UIImageView?+{
++++if+let+hairLineView+=+view+as?+UIImageView+where+hairLineView.bounds.size.height+<=+1.0+{
++++++++return+hairLineView
++++}

++++if+let+hairLineView+=+view.subviews.flatMap({self.findHairLineInImageViewUnder(view:+$0)}).first+{
++++++return+hairLineView
++++}

++++return+nil
}|code-block|syntax|javascript|8701|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A nice short Swift function to find the hairline in the subviews is this one:

<pre><code> func findHairLineInImageViewUnder(view view: UIView) -&gt; UIImageView? {
 if let hairLineView = view as? UIImageView where hairLineView.bounds.size.height &lt;= 1.0 {
 return hairLineView
 }

 if let hairLineView = view.subviews.flatMap({self.findHairLineInImageViewUnder(view: $0)}).first {
 return hairLineView
 }

 return nil
}
</code></pre>

blocks|key|225329|text|对于iOS+9的用户来说，这对我来说很有效。只需添加以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225330|UINavigationBar.appearance().shadowImage+=+UIImage()|code-block|syntax|javascript|225331|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For iOS 9 users, this worked for me. just add this:

<pre><code>UINavigationBar.appearance().shadowImage = UIImage()
</code></pre>

blocks|key|8760|text|目标C对上述问题的回答|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8761|//移除导航栏1px行|8762|[[UINavigationBar+appearance]+setBackgroundImage:[[UIImage+alloc]init]+forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar+appearance]+setShadowImage:[[UIImage+alloc]+init]];
[[UINavigationBar+appearance]+setTranslucent:NO];
[[UINavigationBar+appearance]+setTintColor:[UIColor+yourColor]];|code-block|syntax|javascript|8763|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Objective C Answer to Above Question

// removing 1px line of navigation bar

<pre><code>[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc]init] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];
[[UINavigationBar appearance] setTranslucent:NO];
[[UINavigationBar appearance] setTintColor:[UIColor yourColor]];
</code></pre>

blocks|key|225367|text|pxpgraphics是Swift+3.0的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225368|import+Foundation
import+UIKit

extension+UINavigationBar+{

++func+hideBottomHairline()+{
++++let+navigationBarImageView+=+hairlineImageViewInNavigationBar(view:+self)
++++navigationBarImageView!.isHidden+=+true
++}

++func+showBottomHairline()+{
++++let+navigationBarImageView+=+hairlineImageViewInNavigationBar(view:+self)
++++navigationBarImageView!.isHidden+=+false
++}

++private+func+hairlineImageViewInNavigationBar(view:+UIView)+->+UIImageView?+{
++++if+view+is+UIImageView+&&+view.bounds.height+<=+1.0+{
++++++return+(view+as!+UIImageView)
++++}

++++let+subviews+=+(view.subviews+as+[UIView])
++++for+subview:+UIView+in+subviews+{
++++++if+let+imageView:+UIImageView+=+hairlineImageViewInNavigationBar(view:+subview)+{
++++++++return+imageView
++++++}
++++}
++++return+nil
++}
}

extension+UIToolbar+{

++func+hideHairline()+{
++++let+navigationBarImageView+=+hairlineImageViewInToolbar(view:+self)
++++navigationBarImageView!.isHidden+=+true
++}

++func+showHairline()+{
++++let+navigationBarImageView+=+hairlineImageViewInToolbar(view:+self)
++++navigationBarImageView!.isHidden+=+false
++}

++private+func+hairlineImageViewInToolbar(view:+UIView)+->+UIImageView?+{
++++if+view+is+UIImageView+&&+view.bounds.height+<=+1.0+{
++++++return+(view+as!+UIImageView)
++++}

++++let+subviews+=+(view.subviews+as+[UIView])
++++for+subview:+UIView+in+subviews+{
++++++if+let+imageView:+UIImageView+=+hairlineImageViewInToolbar(view:+subview)+{
++++++++return+imageView
++++++}
++++}
++++return+nil
++}
}|code-block|syntax|javascript|225369|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

pxpgraphics's answer for Swift 3.0. 

<pre><code>import Foundation
import UIKit

extension UINavigationBar {

 func hideBottomHairline() {
 let navigationBarImageView = hairlineImageViewInNavigationBar(view: self)
 navigationBarImageView!.isHidden = true
 }

 func showBottomHairline() {
 let navigationBarImageView = hairlineImageViewInNavigationBar(view: self)
 navigationBarImageView!.isHidden = false
 }

 private func hairlineImageViewInNavigationBar(view: UIView) -&gt; UIImageView? {
 if view is UIImageView &amp;&amp; view.bounds.height &lt;= 1.0 {
 return (view as! UIImageView)
 }

 let subviews = (view.subviews as [UIView])
 for subview: UIView in subviews {
 if let imageView: UIImageView = hairlineImageViewInNavigationBar(view: subview) {
 return imageView
 }
 }
 return nil
 }
}

extension UIToolbar {

 func hideHairline() {
 let navigationBarImageView = hairlineImageViewInToolbar(view: self)
 navigationBarImageView!.isHidden = true
 }

 func showHairline() {
 let navigationBarImageView = hairlineImageViewInToolbar(view: self)
 navigationBarImageView!.isHidden = false
 }

 private func hairlineImageViewInToolbar(view: UIView) -&gt; UIImageView? {
 if view is UIImageView &amp;&amp; view.bounds.height &lt;= 1.0 {
 return (view as! UIImageView)
 }

 let subviews = (view.subviews as [UIView])
 for subview: UIView in subviews {
 if let imageView: UIImageView = hairlineImageViewInToolbar(view: subview) {
 return imageView
 }
 }
 return nil
 }
}
</code></pre>

blocks|key|8796|text|您应该在UISearchBar的底部添加一个视图|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8797|let+rect+=+searchController.searchBar.frame;
let+lineView+:+UIView+=+UIView.init(frame:+CGRect.init(x:+0,+y:+rect.size.height-1,+width:+rect.size.width,+height:+1))
lineView.backgroundColor+=+UIColor.init(hexString:+"8CC73E")
searchController.searchBar.addSubview(lineView)|code-block|syntax|javascript|8798|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You should add a view to a bottom of the UISearchBar 

<pre><code>let rect = searchController.searchBar.frame;
let lineView : UIView = UIView.init(frame: CGRect.init(x: 0, y: rect.size.height-1, width: rect.size.width, height: 1))
lineView.backgroundColor = UIColor.init(hexString: "8CC73E")
searchController.searchBar.addSubview(lineView)
</code></pre>

blocks|key|8808|text|在Swift+3.0中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8809|通过将以下代码添加到应用程序函数中来编辑AppDelegate.swift：|offset|length|style|CODE|8810|//+Override+point+for+customization+after+application+launch.

//+Remove+border+in+navigationBar
UINavigationBar.appearance().shadowImage+=+UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(),+for:+.default)|code-block|syntax|javascript|8811|entityMap^0|0|K|H|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In Swift 3.0

Edit your <code>AppDelegate.swift</code> by adding the following code to your application function:

<pre><code>// Override point for customization after application launch.

// Remove border in navigationBar
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
</code></pre>

blocks|key|225431|text|嗨，这适用于Swift+4。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225432|++++override+func+viewDidLayoutSubviews()+{
++++super.viewDidLayoutSubviews()
++++self.navigationController?.navigationBar.shadowImage+=+UIImage()
++++self.navigationController?.navigationBar.setBackgroundImage(UIImage(),+for:+.default)
++++self.navigationController?.navigationBar.isTranslucent+=+false
}|code-block|syntax|javascript|225433|您需要将其放入viewDidLayoutSubviews中，而不是viewDidLoad中|225434|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Hi this works for Swift 4.

<pre><code> override func viewDidLayoutSubviews() {
 super.viewDidLayoutSubviews()
 self.navigationController?.navigationBar.shadowImage = UIImage()
 self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
 self.navigationController?.navigationBar.isTranslucent = false
}
</code></pre>

you need to put this in viewDidLayoutSubviews instead of viewDidLoad

blocks|key|8858|text|两行解决方案，这对我是有效的。尝试在ViewDidLoad方法中添加以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8859|navigationController?.navigationBar.setValue(true,+forKey:+"hidesShadow")
self.extendedLayoutIncludesOpaqueBars+=+true|code-block|syntax|javascript|8860|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Two lines solution that works for me. Try to add this in ViewDidLoad method: 

<pre><code>navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")
self.extendedLayoutIncludesOpaqueBars = true
</code></pre>

blocks|key|8864|text|++++++++if+#available(iOS+13.0,+*)+{
++++++++++++let+appearance+=+UINavigationBarAppearance()
++++++++++++appearance.backgroundColor++++++++++=+Colors.color_app
++++++++++++appearance.titleTextAttributes++++++=+[.foregroundColor+:+UIColor.white]
++++++++++++appearance.largeTitleTextAttributes+=+[.foregroundColor+:+UIColor.white]
++++++++++++appearance.shadowColor+=+.clear
++++++++++++appearance.shadowImage+=+UIImage()
++++++++++++
++++++++++++UINavigationBar.appearance().tintColor++++++++++++=+.white
++++++++++++UINavigationBar.appearance().standardAppearance+++=+appearance
++++++++++++UINavigationBar.appearance().compactAppearance++++=+appearance
++++++++++++UINavigationBar.appearance().scrollEdgeAppearance+=+appearance
++++++++}+else+{
++++++++++++UINavigationBar.appearance().barTintColor++++++++=+Colors.color_app
++++++++++++UINavigationBar.appearance().tintColor+++++++++++=+.white
++++++++++++UINavigationBar.appearance().titleTextAttributes+=+[NSAttributedString.Key.foregroundColor+:+UIColor.white]
++++++++++++if+#available(iOS+11.0,+*)+{
++++++++++++++++UINavigationBar.appearance().largeTitleTextAttributes+=+[NSAttributedString.Key.foregroundColor:+UIColor.white]
++++++++++++}
++++++++++++UINavigationBar.appearance().isTranslucent+=+false
++++++++++++
++++++++++++UINavigationBar.appearance().shadowImage+=+UIImage()
++++++++++++UINavigationBar.appearance().setBackgroundImage(UIImage(),+for:+.default)
++++++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|8865|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> if #available(iOS 13.0, *) {
 let appearance = UINavigationBarAppearance()
 appearance.backgroundColor = Colors.color_app
 appearance.titleTextAttributes = [.foregroundColor : UIColor.white]
 appearance.largeTitleTextAttributes = [.foregroundColor : UIColor.white]
 appearance.shadowColor = .clear
 appearance.shadowImage = UIImage()
 
 UINavigationBar.appearance().tintColor = .white
 UINavigationBar.appearance().standardAppearance = appearance
 UINavigationBar.appearance().compactAppearance = appearance
 UINavigationBar.appearance().scrollEdgeAppearance = appearance
 } else {
 UINavigationBar.appearance().barTintColor = Colors.color_app
 UINavigationBar.appearance().tintColor = .white
 UINavigationBar.appearance().titleTextAttributes = [NSAttributedString.Key.foregroundColor : UIColor.white]
 if #available(iOS 11.0, *) {
 UINavigationBar.appearance().largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
 }
 UINavigationBar.appearance().isTranslucent = false
 
 UINavigationBar.appearance().shadowImage = UIImage()
 UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
 }
</code></pre>

blocks|key|225491|text|编写自己的初始化器:D|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225492|import+Foundation
import+UIKit

extension+UINavigationController+{
++++convenience+init(rootViewController+:+UIViewController,+hidesShadow+:+Bool)+{
++++++++self.init(rootViewController+:+rootViewController)
++++++++self.navigationBar.setValue(hidesShadow,+forKey:+"hidesShadow")
++++++++if+hidesShadow+{
++++++++++++self.extendedLayoutIncludesOpaqueBars+=+true
++++++++++++self.navigationBar.isTranslucent+=+false+
++++++++}
++++}
}|code-block|syntax|javascript|225493|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Write your own initializer :D
<pre><code>import Foundation
import UIKit

extension UINavigationController {
 convenience init(rootViewController : UIViewController, hidesShadow : Bool) {
 self.init(rootViewController : rootViewController)
 self.navigationBar.setValue(hidesShadow, forKey: &quot;hidesShadow&quot;)
 if hidesShadow {
 self.extendedLayoutIncludesOpaqueBars = true
 self.navigationBar.isTranslucent = false 
 }
 }
}
</code></pre>

blocks|key|225542|text|不使用navigationController?.navigationBar.setValue(true,+forKey:+"hidesShadow")是非常重要的，因为在任何时候，苹果都可以去掉"hidesShadow“键路径。如果他们这样做，任何使用此调用的应用程序都会崩溃。由于您不访问类的直接API，因此此调用会被App+Store拒绝。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|225543|从iOS+13开始，为确保效率，您可以执行以下操作：|225544|navigationBar.standardAppearance.shadowColor+=+nil|225545|entityMap^0|3|21|0|0|0|1E|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

It's very important to not use <code>navigationController?.navigationBar.setValue(true, forKey: &quot;hidesShadow&quot;)</code> because at any time, Apple could remove the &quot;hidesShadow&quot; key path. If they were to do this, any app using this call would break. Since you are not accessing the direct API of a class, this call is subject to App Store rejection.
As of iOS 13, to ensure efficiency, you can do the following:
<code>navigationBar.standardAppearance.shadowColor = nil</code>

blocks|key|225650|text|这里有一个非常重要的注意事项--改变UIViewController的navigationItem的外观要比直接改变navigationBar的外观灵活得多。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|225651|你为什么这么问？|225652|原因很简单，因为navigationItem绑定到单个UIViewController，并表示该特定navigationBar的UIViewController状态。这很重要，因为您不必处理viewWillAppear+(或类似的东西)中不同视图控制器之间的导航栏更改，就像更改navigationBar一样；记住，它是在给定导航堆栈(UINavigationController)的所有视图控制器之间共享的，在一个地方更改它会更改堆栈上所有视图控制器的导航栏。|225653|您只需为特定的视图控制器设置正确的UINavigationBarAppearance，UIKit就会正确地更新导航栏样式，从而确定哪个视图控制器当前是导航堆栈上的顶部视图控制器。|225654|navigationItem.standardAppearance`+=+`UINavigationBarAppearance()|code-block|syntax|javascript|225655|entityMap^0|I|G|Z|E|1M|D|0|0|8|E|R|G|1E|D|1S|G|2N|E|3V|D|4O|M|0|H|P|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|L|3|M|5|N|7|1I|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|1J|8|@]|D|@]|E|$]]]|R|$]]

One very important note here - it's a lot more flexible to change the appearance of the <code>UIViewController</code>'s <code>navigationItem</code> than the <code>navigationBar</code> directly.
Why you ask?
For the simple reason that the <code>navigationItem</code> is tied to a single <code>UIViewController</code> and represents the state of the <code>navigationBar</code> for that particular <code>UIViewController</code>. This is big, as you don't have to handle the navigation bar changes between different view controllers within <code>viewWillAppear</code> (or something similar), as you would if you mutated the <code>navigationBar</code>; which is, remember, shared between all view controllers of a given navigation stack (<code>UINavigationController</code>), and changing it in one place changes it for all view controllers up to the stack.
You just set the correct <code>UINavigationBarAppearance</code> for a particular view controller and UIKit will correctly update the navigation bar styling depeneding on which view controller is currently the top view controller on the navigation stack.
<pre><code>navigationItem.standardAppearance` = `UINavigationBarAppearance()
</code></pre>

I have an app that sometimes needs its navigation bar to blend in with the content. 

Does anyone know how to get rid of or to change color of this annoying little bar? 

On the image below situation i have - i'm talking about this 1px height line below "Root View Controller"

<img src="https://i.stack.imgur.com/iE0SO.png" alt="enter image description here">

How to hide UINavigationBar 1px bottom line

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个应用程序，有时需要它的导航栏与内容混在一起。有没有人知道如何摆脱或改变这个讨厌的小酒吧的颜色？在下面的图片中，我有--我说的是"Root View Controller“下面这条1px的高度线。​​

问如何隐藏UINavigationBar 1px的底线
EN

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问如何隐藏UINavigationBar 1px的底线EN