blocks|key|179380|text|来自这个答案|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|179381|[self.navigationController.navigationBar+setBackgroundImage:[UIImage+new]
+++++++++++++++++++++forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage+=+[UIImage+new];
self.navigationController.navigationBar.translucent+=+YES;
self.navigationController.view.backgroundColor+=+[UIColor+clearColor];
self.navigationController.navigationBar.backgroundColor+=+[UIColor+clearColor];|code-block|syntax|javascript|179382|此外，正如Josh在评论中所建议的那样，将这个栏恢复到默认状态：|179383|[self.navigationController.navigationBar+setBackgroundImage:nil
+++++++++++++++++++++forBarMetrics:UIBarMetricsDefault];|179384|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/18969248/how-to-draw-a-transparent-uitoolbar-or-uinavigationbar-in-ios7^0|2|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

From <a href="https://stackoverflow.com/questions/18969248/how-to-draw-a-transparent-uitoolbar-or-uinavigationbar-in-ios7">this answer</a>

<pre><code>[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
 forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.view.backgroundColor = [UIColor clearColor];
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
</code></pre>

Also, as suggested by Josh in the comments, to put the bar back to default:

<pre><code>[self.navigationController.navigationBar setBackgroundImage:nil
 forBarMetrics:UIBarMetricsDefault];
</code></pre>

blocks|key|2282557|text|艾伦忘了一句台词|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2282558|self.navigationController.navigationBar.backgroundColor+=+[UIColor+clearColor];|code-block|syntax|javascript|2282559|所以我有：|2282560|[self.navigationController.navigationBar+setTranslucent:YES];
self.navigationController.view.backgroundColor+=+[UIColor+clearColor];
[self.navigationController.navigationBar+setBackgroundImage:[[UIImage+alloc]+init]+forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage+=+[[UIImage+alloc]+init];
self.navigationController.navigationBar.backgroundColor+=+[UIColor+clearColor];|2282561|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|$]]

Alan forgot one line

<pre><code>self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
</code></pre>

So I have:

<pre><code>[self.navigationController.navigationBar setTranslucent:YES];
self.navigationController.view.backgroundColor = [UIColor clearColor];
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
</code></pre>

blocks|key|180146|text|作为目标的独立解决方案-C类：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|180147|UINavigationController%2BTransparentNavigationController.h|offset|length|style|BOLD|180148|@interface+UINavigationController+(TransparentNavigationController)
-+(void)presentTransparentNavigationBar;
-+(void)hideTransparentNavigationBar;
@end|code-block|syntax|javascript|180149|UINavigationController%2BTransparentNavigationController.m|180150|#import+"UINavigationController%2BTransparentNavigationController.h"

@implementation+UINavigationController+(TransparentNavigationController)

-+(void)presentTransparentNavigationBar
{
++[self.navigationBar+setBackgroundImage:[UIImage+new]+forBarMetrics:UIBarMetricsDefault];
++[self.navigationBar+setTranslucent:YES];
++[self.navigationBar+setShadowImage:[UIImage+new]];
++[self+setNavigationBarHidden:NO+animated:YES];
}

-+(void)hideTransparentNavigationBar
{
++[self+setNavigationBarHidden:YES+animated:NO];
++[self.navigationBar+setBackgroundImage:[[UINavigationBar+appearance]+backgroundImageForBarMetrics:UIBarMetricsDefault]+forBarMetrics:UIBarMetricsDefault];
++[self.navigationBar+setTranslucent:[[UINavigationBar+appearance]+isTranslucent]];
++[self.navigationBar+setShadowImage:[[UINavigationBar+appearance]+shadowImage]];
}

@end|180151|现在，您可以在UIViewController中导入类别并调用导航控制器上的方法--例如：|CODE|180152|#import+"UINavigationController%2BTransparentNavigationController.h"

-+(void)viewWillAppear:(BOOL)animated
{
++[super+viewWillAppear:animated];
++[self.navigationController+presentTransparentNavigationBar];
}

-+(void)viewWillDisappear:(BOOL)animated
{
++[super+viewWillDisappear:animated];
++[self.navigationController+hideTransparentNavigationBar];
}|180153|以及Swift中的类似解决方案|180154|import+Foundation
import+UIKit

extension+UINavigationController+{

++public+func+presentTransparentNavigationBar()+{
++++navigationBar.setBackgroundImage(UIImage(),+forBarMetrics:UIBarMetrics.Default)
++++navigationBar.translucent+=+true
++++navigationBar.shadowImage+=+UIImage()
++++setNavigationBarHidden(false,+animated:true)
++}

++public+func+hideTransparentNavigationBar()+{
++++setNavigationBarHidden(true,+animated:false)
++++navigationBar.setBackgroundImage(UINavigationBar.appearance().backgroundImageForBarMetrics(UIBarMetrics.Default),+forBarMetrics:UIBarMetrics.Default)
++++navigationBar.translucent+=+UINavigationBar.appearance().translucent
++++navigationBar.shadowImage+=+UINavigationBar.appearance().shadowImage
++}
}|180155|entityMap^0|0|0|1K|0|0|0|1K|0|0|7|G|0|0|2|5|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|19|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1A|8|@$D|1B|E|1C|F|S]]|9|@]|A|$]]|$1|T|3|U|5|J|7|1D|8|@]|9|@]|A|$K|L]]|$1|V|3|W|5|6|7|1E|8|@$D|1F|E|1G|F|G]]|9|@]|A|$]]|$1|X|3|Y|5|J|7|1H|8|@]|9|@]|A|$K|L]]|$1|Z|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|10|$]]

Self contained solution as an Objective-C Category:

UINavigationController+TransparentNavigationController.h

<pre><code>@interface UINavigationController (TransparentNavigationController)
- (void)presentTransparentNavigationBar;
- (void)hideTransparentNavigationBar;
@end
</code></pre>

UINavigationController+TransparentNavigationController.m

<pre><code>#import "UINavigationController+TransparentNavigationController.h"

@implementation UINavigationController (TransparentNavigationController)

- (void)presentTransparentNavigationBar
{
 [self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
 [self.navigationBar setTranslucent:YES];
 [self.navigationBar setShadowImage:[UIImage new]];
 [self setNavigationBarHidden:NO animated:YES];
}

- (void)hideTransparentNavigationBar
{
 [self setNavigationBarHidden:YES animated:NO];
 [self.navigationBar setBackgroundImage:[[UINavigationBar appearance] backgroundImageForBarMetrics:UIBarMetricsDefault] forBarMetrics:UIBarMetricsDefault];
 [self.navigationBar setTranslucent:[[UINavigationBar appearance] isTranslucent]];
 [self.navigationBar setShadowImage:[[UINavigationBar appearance] shadowImage]];
}

@end
</code></pre>

Now, you can import the category in your <code>UIViewController</code> and call the methods on your navigation controller - for example:

<pre><code>#import "UINavigationController+TransparentNavigationController.h"

- (void)viewWillAppear:(BOOL)animated
{
 [super viewWillAppear:animated];
 [self.navigationController presentTransparentNavigationBar];
}

- (void)viewWillDisappear:(BOOL)animated
{
 [super viewWillDisappear:animated];
 [self.navigationController hideTransparentNavigationBar];
}
</code></pre>

And a similar solution in Swift:

<pre><code>import Foundation
import UIKit

extension UINavigationController {

 public func presentTransparentNavigationBar() {
 navigationBar.setBackgroundImage(UIImage(), forBarMetrics:UIBarMetrics.Default)
 navigationBar.translucent = true
 navigationBar.shadowImage = UIImage()
 setNavigationBarHidden(false, animated:true)
 }

 public func hideTransparentNavigationBar() {
 setNavigationBarHidden(true, animated:false)
 navigationBar.setBackgroundImage(UINavigationBar.appearance().backgroundImageForBarMetrics(UIBarMetrics.Default), forBarMetrics:UIBarMetrics.Default)
 navigationBar.translucent = UINavigationBar.appearance().translucent
 navigationBar.shadowImage = UINavigationBar.appearance().shadowImage
 }
}
</code></pre>

blocks|key|2282617|text|For+Swift3和Swift4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2282618|self.navigationController?.navigationBar.setBackgroundImage(UIImage(),+for:+.default)
self.navigationController?.navigationBar.shadowImage+=+UIImage()
self.navigationController?.navigationBar.isTranslucent+=+true|code-block|syntax|javascript|2282619|For+Swift2.2|2282620|+self.navigationController?.navigationBar.setBackgroundImage(UIImage(),+forBarMetrics:+.Default)
+self.navigationController?.navigationBar.shadowImage+=+UIImage()
+self.navigationController?.navigationBar.translucent+=+true|2282621|For+Objective+C|2282622|[self.navigationController.navigationBar+setBackgroundImage:[UIImage+new]+forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage+=+[UIImage+new];
self.navigationController.navigationBar.translucent+=+YES;|2282623|entityMap^0|0|H|0|0|0|C|0|0|0|F|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|T|$]]

For Swift3 and Swift4

<pre><code>self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.isTranslucent = true
</code></pre>

For Swift2.2

<pre><code> self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
 self.navigationController?.navigationBar.shadowImage = UIImage()
 self.navigationController?.navigationBar.translucent = true
</code></pre>

For Objective-C

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

blocks|key|2282663|text|使用UINavigationBar%2BAddition+pod，然后只需调用：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2282664|UINavigationBar+*navigationBar+=+self.navigationController.navigationBar;
[navigationBar+makeTransparent];|code-block|syntax|javascript|2282665|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/samwize/UINavigationBar-Addition^0|2|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]]]]

Use <a href="https://github.com/samwize/UINavigationBar-Addition" rel="nofollow">UINavigationBar+Addition</a> pod, then simply call:

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

blocks|key|1205775|text|[(UIView*)self.navigationController.navigationBar.subviews+objectAtIndex:0+setAlpha:0.0f]；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1205776|这句话似乎很适合我|1205777|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

[(UIView*)[self.navigationController.navigationBar.subviews objectAtIndex:0] setAlpha:0.0f];

That one line seemed to work perfectly for me

blocks|key|180175|text|@Zorayr的伟大答案被修改为Swift+3：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|180176|import+Foundation
import+UIKit

extension+UINavigationController+{

++++public+func+presentTransparentNavigationBar()+{
++++++++navigationBar.setBackgroundImage(UIImage(),+for:.default)
++++++++navigationBar.isTranslucent+=+true
++++++++navigationBar.shadowImage+=+UIImage()
++++++++setNavigationBarHidden(false,+animated:true)
++++}

++++public+func+hideTransparentNavigationBar()+{
++++++++setNavigationBarHidden(true,+animated:false)
++++++++navigationBar.setBackgroundImage(UINavigationBar.appearance().backgroundImage(for:+UIBarMetrics.default),+for:.default)
++++++++navigationBar.isTranslucent+=+UINavigationBar.appearance().isTranslucent
++++++++navigationBar.shadowImage+=+UINavigationBar.appearance().shadowImage
++++}
}|code-block|syntax|javascript|180177|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|$]]

@Zorayr's great answer revised to Swift 3 : 

<pre><code>import Foundation
import UIKit

extension UINavigationController {

 public func presentTransparentNavigationBar() {
 navigationBar.setBackgroundImage(UIImage(), for:.default)
 navigationBar.isTranslucent = true
 navigationBar.shadowImage = UIImage()
 setNavigationBarHidden(false, animated:true)
 }

 public func hideTransparentNavigationBar() {
 setNavigationBarHidden(true, animated:false)
 navigationBar.setBackgroundImage(UINavigationBar.appearance().backgroundImage(for: UIBarMetrics.default), for:.default)
 navigationBar.isTranslucent = UINavigationBar.appearance().isTranslucent
 navigationBar.shadowImage = UINavigationBar.appearance().shadowImage
 }
}
</code></pre>

blocks|key|1205786|text|Swift+4.2和iOS+12|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1205787|事实证明，你真正需要的是下面的代码。当您将它放入viewDidLoad()中时，它工作得非常完美。|CODE|1205788|//+removes+line+at+bottom+of+navigation+bar
navigationController?.navigationBar.shadowImage+=+UIImage()

//+makes+navigation+bar+completely+transparent
navigationController?.navigationBar.setBackgroundImage(UIImage(),+for:+.default)
navigationController?.navigationBar.isTranslucent+=+true|code-block|syntax|javascript|1205789|entityMap^0|0|G|0|O|D|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|V|8|@]|D|@]|E|$L|M]]|$1|N|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|O|$]]

Swift 4.2 and iOS 12

It turns out all you really need is the code below. It works perfectly when you put it into <code>viewDidLoad()</code>.

<pre><code>// removes line at bottom of navigation bar
navigationController?.navigationBar.shadowImage = UIImage()

// makes navigation bar completely transparent
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationController?.navigationBar.isTranslucent = true
</code></pre>

I want the UINavigationBar in my app to be completely transparent and flush with the viewcontroller directly under it. However, the only code I could find makes it translucent but not transparent. I know this can be done in iOS 7 because it is used in the notes app. My question is, what is the code they used to do it?

How to make completely transparent navigation bar in iOS 7

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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我希望我的应用程序中的UINavigationBar是完全透明的，并与其直接下方的视图控制器同花顺。然而，我唯一能找到的代码使它透明但不透明。我知道这可以在iOS 7中完成，因为它在notes应用程序中使用。我的问题是，他们用来做这件事的代码是什么？

问如何在iOS 7中制作完全透明的导航栏
EN

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问如何在iOS 7中制作完全透明的导航栏EN