blocks|key|2705790|text|尝试此解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2705791|@interface+ViewController+()+<UIToolbarDelegate>
{
++++UIToolbar+*+lpToolbar;
}
@end

-+(void)viewDidLoad+{
++++[super+viewDidLoad];
++++//+Do+any+additional+setup+after+loading+the+view,+typically+from+a+nib.
++++lpToolbar+=+[[UIToolbar+alloc]+initWithFrame+:CGRectZero];
++++lpToolbar.delegate+=+self;
++++self.navigationItem.title+=+@"Title";
}

-(void)+viewWillAppear+:(BOOL)animated
{
++++[super+viewWillAppear:animated];

++++[self.navigationController.view+addSubview+:lpToolbar];
++++CGRect+rFrame+=+self.navigationController.navigationBar.frame;
++++lpToolbar.frame+=+CGRectMake(+0.0,+rFrame.origin.y+%2B+rFrame.size.height,+rFrame.size.width,+50.0+);
}

-(void)+viewWillDisappear:(BOOL)animated
{
++++[super+viewWillDisappear:animated];

++++[lpToolbar+removeFromSuperview];
}

-(UIBarPosition)+positionForBar:(id+<UIBarPositioning>)bar
{
++++return+UIBarPositionTop;
}|code-block|syntax|javascript|2705792|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|$]]

Try this solution

<pre><code>@interface ViewController () &lt;UIToolbarDelegate&gt;
{
 UIToolbar * lpToolbar;
}
@end

- (void)viewDidLoad {
 [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.
 lpToolbar = [[UIToolbar alloc] initWithFrame :CGRectZero];
 lpToolbar.delegate = self;
 self.navigationItem.title = @"Title";
}

-(void) viewWillAppear :(BOOL)animated
{
 [super viewWillAppear:animated];

 [self.navigationController.view addSubview :lpToolbar];
 CGRect rFrame = self.navigationController.navigationBar.frame;
 lpToolbar.frame = CGRectMake( 0.0, rFrame.origin.y + rFrame.size.height, rFrame.size.width, 50.0 );
}

-(void) viewWillDisappear:(BOOL)animated
{
 [super viewWillDisappear:animated];

 [lpToolbar removeFromSuperview];
}

-(UIBarPosition) positionForBar:(id &lt;UIBarPositioning&gt;)bar
{
 return UIBarPositionTop;
}
</code></pre>

blocks|key|2705848|text|我知道有两种选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2705849|1)与Move+UINavigationController's+toolbar+to+the+top+to+lie+underneath+navigation+bar相关|offset|length|2705850|您可以设置UINavigationController的子类，并在设置该值时更改工具栏的Y轴位置。|style|CODE|2705851|import+UIKit

private+var+context+=+0

class+NavigationController:+UINavigationController+{
++++private+var+inToolbarFrameChange+=+false
++++var+observerBag:+[NSKeyValueObservation]+=+[]

++++override+func+awakeFromNib()+{
++++++++super.awakeFromNib()
++++++++self.inToolbarFrameChange+=+false
++++}

++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()

++++++++observerBag.append(
++++++++++++toolbar.observe(\.center,+options:+.new)+{+toolbar,+_+in
++++++++++++++++if+!self.inToolbarFrameChange+{
++++++++++++++++++++self.inToolbarFrameChange+=+true
++++++++++++++++++++toolbar.frame+=+CGRect(
++++++++++++++++++++++++x:+0,
++++++++++++++++++++++++y:+self.navigationBar.frame.height+%2B+UIApplication.shared.statusBarFrame.height,
++++++++++++++++++++++++width:+toolbar.frame.width,
++++++++++++++++++++++++height:+toolbar.frame.height
++++++++++++++++++++)
++++++++++++++++++++self.inToolbarFrameChange+=+false
++++++++++++++++}
++++++++++++}
++++++++)
++++}

++++override+func+setToolbarHidden(_+hidden:+Bool,+animated:+Bool)+{
++++++++super.setToolbarHidden(hidden,+animated:+false)

++++++++var+rectTB+=+self.toolbar.frame
++++++++rectTB+=+.zero
++++}
}|code-block|syntax|javascript|2705852|2)您可以创建自己的UIToolbar并添加到UIViewController的视图中。然后，将约束添加到安全区域的前导、尾部和顶部。|2705853|import+UIKit

final+class+ViewController:+UIViewController+{
++++private+let+toolbar+=+UIToolbar()
++++private+let+segmentedControl:+UISegmentedControl+=+{
++++++++let+control+=+UISegmentedControl(items:+["Op+1",+"Op+2"])
++++++++control.isEnabled+=+false
++++++++return+control
++++}()

+++override+func+loadView()+{
++++++++super.loadView()
++++++++setupToolbar()
+++}

++++override+func+viewWillAppear(_+animated:+Bool)+{
++++++++super.viewWillAppear(animated)
++++++++navigationController?.navigationBar.hideBorderLine()
++++}

++++private+func+setupToolbar()+{
++++++++let+barItem+=+UIBarButtonItem(customView:+segmentedControl)
++++++++toolbar.setItems([barItem],+animated:+false)
++++++++toolbar.isTranslucent+=+false
++++++++toolbar.isOpaque+=+false

++++++++view.addSubview(toolbar)

++++++++toolbar.translatesAutoresizingMaskIntoConstraints+=+false
++++++++toolbar.leadingAnchor.constraint(equalTo:+view.leadingAnchor).isActive+=+true
++++++++toolbar.trailingAnchor.constraint(equalTo:+view.trailingAnchor).isActive+=+true
++++++++toolbar.topAnchor.constraint(equalTo:+view.safeAreaLayoutGuide.topAnchor).isActive+=+true
++++}
}

private+extension+UINavigationBar+{

++++func+showBorderLine()+{
++++++++findBorderLine().isHidden+=+false
++++}

++++func+hideBorderLine()+{
++++++++findBorderLine().isHidden+=+true
++++}

++++private+func+findBorderLine()+->+UIImageView!+{
++++++++return+self.subviews
++++++++++++.flatMap+{+$0.subviews+}
++++++++++++.compactMap+{+$0+as?+UIImageView+}
++++++++++++.filter+{+$0.bounds.size.width+==+self.bounds.size.width+}
++++++++++++.filter+{+$0.bounds.size.height+<=+2+}
++++++++++++.first
++++}
}|2705854|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/31492927/move-uinavigationcontrollers-toolbar-to-the-top-to-lie-underneath-navigation-ba/35971557#35971557^0|0|3|29|0|0|5|M|0|0|A|9|N|G|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|F|3|G|5|6|7|15|8|@$D|16|E|17|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|18|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|19|8|@$D|1A|E|1B|H|I]|$D|1C|E|1D|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1E|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

There are 2 options that I'm aware of. 

1) Related to <a href="https://stackoverflow.com/questions/31492927/move-uinavigationcontrollers-toolbar-to-the-top-to-lie-underneath-navigation-ba/35971557#35971557">Move UINavigationController&#39;s toolbar to the top to lie underneath navigation bar</a>

You can subclass <code>UINavigationController</code> and change the Y-axis position of the toolbar when the value is set.

<pre class="lang-swift prettyprint-override"><code>import UIKit

private var context = 0

class NavigationController: UINavigationController {
 private var inToolbarFrameChange = false
 var observerBag: [NSKeyValueObservation] = []

 override func awakeFromNib() {
 super.awakeFromNib()
 self.inToolbarFrameChange = false
 }

 override func viewDidLoad() {
 super.viewDidLoad()

 observerBag.append(
 toolbar.observe(\.center, options: .new) { toolbar, _ in
 if !self.inToolbarFrameChange {
 self.inToolbarFrameChange = true
 toolbar.frame = CGRect(
 x: 0,
 y: self.navigationBar.frame.height + UIApplication.shared.statusBarFrame.height,
 width: toolbar.frame.width,
 height: toolbar.frame.height
 )
 self.inToolbarFrameChange = false
 }
 }
 )
 }

 override func setToolbarHidden(_ hidden: Bool, animated: Bool) {
 super.setToolbarHidden(hidden, animated: false)

 var rectTB = self.toolbar.frame
 rectTB = .zero
 }
}
</code></pre>

2) You can create your own <code>UIToolbar</code> and add it to view of the <code>UIViewController</code>. Then, you add the constraints to the leading, trailing and the top of the safe area.

<pre class="lang-swift prettyprint-override"><code>import UIKit

final class ViewController: UIViewController {
 private let toolbar = UIToolbar()
 private let segmentedControl: UISegmentedControl = {
 let control = UISegmentedControl(items: ["Op 1", "Op 2"])
 control.isEnabled = false
 return control
 }()

 override func loadView() {
 super.loadView()
 setupToolbar()
 }

 override func viewWillAppear(_ animated: Bool) {
 super.viewWillAppear(animated)
 navigationController?.navigationBar.hideBorderLine()
 }

 private func setupToolbar() {
 let barItem = UIBarButtonItem(customView: segmentedControl)
 toolbar.setItems([barItem], animated: false)
 toolbar.isTranslucent = false
 toolbar.isOpaque = false

 view.addSubview(toolbar)

 toolbar.translatesAutoresizingMaskIntoConstraints = false
 toolbar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
 toolbar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
 toolbar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
 }
}

private extension UINavigationBar {

 func showBorderLine() {
 findBorderLine().isHidden = false
 }

 func hideBorderLine() {
 findBorderLine().isHidden = true
 }

 private func findBorderLine() -&gt; UIImageView! {
 return self.subviews
 .flatMap { $0.subviews }
 .compactMap { $0 as? UIImageView }
 .filter { $0.bounds.size.width == self.bounds.size.width }
 .filter { $0.bounds.size.height &lt;= 2 }
 .first
 }
}

</code></pre>

How to move the <code>UIToolBar</code> to top (stick to the <code>UINavigationBar</code>)?

I m struggle with this thing for a long time and I've try some stuff like:

<ul>
<li>Custom <code>UIToolBar</code> that conforms to <code>UIToolbarDelegate</code> and <code>(UIBarPosition)positionForBar:(id &lt;UIBarPositioning&gt;)bar</code> get called
and I return <code>UIBarPositionTop</code> but the toolbar stays at bottom.</li>
<li>Change the toolbar frame: <code>self.navigationController.toolbar.frame = CGRectMake(0, NAV_BAR_Y, self.view.bounds.size.width, NAV_BAR_HEIGHT);</code></li>
<li>Custom <code>UINaviagtionController</code> which has this delegate function: <code>(UIBarPosition)positionForBar:(id &lt;UIBarPositioning&gt;)bar {
return UIBarPositionTop;
}</code></li>
</ul>

None of the struggles goes well, same look:
<a href="https://i.stack.imgur.com/GDeVi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GDeVi.png" alt="enter image description here"></a>

Any Help will be great.

(I would like to have navigation look as <code>Apple</code> <code>App store</code> navigation)

UIToolBar position to top of UINavigationController

如何将UIToolBar移至顶部(坚持使用UINavigationBar)？我在这件事上挣扎了很长一段时间，我已经尝试了一些东西，比如：符合UIToolbarDelegate和(UIBarPosition)positionForBar:(id <UIBarPositioning>)bar的自定义UIToolBar被调用...

问到UINavigationController顶部的UIToolBar位置
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