从self.navigationItem打开时UIPopoverController没有被解雇（在UINavigationController内部） [英] UIPopoverController not dismissed when opened from self.navigationItem (inside UINavigationController)

问题描述

我在解决从UINavigationController的navigationItem启动的popover时遇到问题。似乎UINavigationController插入的导航项不会触发UIPopoverController的解雇。通常，当你在弹出窗口外面敲击时，它会变暗。但是当您点击导航项时，弹出窗口不会被解除。更糟糕的是，如果你点击触发弹出窗口的按钮，你将获得弹出窗口的第二个实例。

I have a problem dismissing a popover that was launched from the navigationItem of a UINavigationController. It seems that the navigation item which is inserted by the UINavigationController does not trigger dismissal of the UIPopoverController. Usually, when you tap outside a popover, it is dimissed. But when you tap on the navigation item, the popover is not dismissed. Worse, if you tap the button which triggers the popover, you'll get a second instance of the popover.

所有这一切都是通过故事板完成的：
- 创建一个视图，将其嵌入到UINavigationView中，以便在顶部获得一个navigationItem。
- 将UIBarButtonItem放入navigationItem（左侧或右侧，与导航堆栈上的初始视图无关）。
- 定义另一个视图，并将一个segue从UIBarButtonItem拖到此视图中。
- 将segue设置为popover。

All of this is done using storyboards: - Create a view, embed it into a UINavigationView so it gets a navigationItem on the top. - Put a UIBarButtonItem into the navigationItem (left or right, doesn't matter for the initial view on the navigation stack). - Define another view, and drag a segue from the UIBarButtonItem to this view. - Set the segue to be popover.

弹出窗口打开后，我无法通过点击navigationItem来解除它。我无法相信这按设计工作，所以我怀疑我错过了什么。

Once the popover is open, I cannot dismiss it by tapping on the navigationItem. I cannot believe this "works as designed", so I suspect I missed out on somthing.

虽然我的目标是尽可能少地编程（这就是故事板的内容，不是吗？），我想到了解决方法：第一个解决方法来到我的想法是在navigationItem中添加一个UITapGestureRecognizer，它会在检测到navigationItem上的点击时关闭popover。不幸的是，navigationItem似乎不是UIVIew，所以它缺少addGestureRecognizer：方法......

Although my goal is to program as little as possible (that's what storyboards are about, aren't they?), I thought about workarounds: The first workaround that came to my mind was to add a UITapGestureRecognizer to the navigationItem, which would dismiss the popover when it detected a tap on the navigationItem. Unfortunately, the navigationItem seems to not be UIVIew, so it lacks the addGestureRecognizer: method...

编辑：向self.navigationController.navigationBar添加UITapGesturerecognizer是可能的，但是防止任何点击到达navigationBar上的UIBarButtonItems。是的，我本可以预料到的。

Adding a UITapGesturerecognizer to self.navigationController.navigationBar is possible, but prevents any tap to reach the UIBarButtonItems on the navigationBar. Yes, I could have expected that.

非常感谢你的帮助，
nobi

Thanks a lot for help, nobi

推荐答案

这是故事板中弹出窗口的完整描述。假设您的控制器出现在popover中，名为 MyPopupController ，请执行以下操作：

Here's the complete description for popovers in storyboards. Assuming your controller to appear in the popover is named MyPopupController, do this:

1. 使用样式 Popover 定义从主场景到 MyPopupController 场景的segue。



2. 将属性添加到 MyPopupController.h

1. Define a segue from the main scene to the MyPopupController scene, using style Popover.

2. Add a property to MyPopupController.h

@property (weak, nonatomic) UIPopoverController *popover;

在 MyPopupController.m

@synthesize popover = _popover

在主场景控制器的 prepareForSegue：sender：方法中，设置 popover property：

In the prepareForSegue:sender: method of the main scene controller, set up the popoverproperty:

UIStoryboardPopoverSegue *ps = (UIStoryboardPopoverSegue *)segue;
MyPopupController *dc = ps.destinationViewController;
dc.popover = ps.popoverController;

在 viewWillAppear：方法中 MyPopupController ，添加以下代码（不要忘记 [super viewWillAppear] ）：

In the viewWillAppear: method of MyPopupController, add the following code (don't forget [super viewWillAppear] as well):

self.popover.passThroughViews = nil;

您现在应该完成。

感谢Robert的基本想法 - 我只需要找到正确的位置，因为 presentPopoverFromBarButtonItem 不会被使用使用故事板。请注意，将（5）放入 viewDidLoad 不起作用。

Thanks to Robert for the basic idea - I just had to find the correct place because presentPopoverFromBarButtonItem is not used when using storyboards. Note that putting (5) into viewDidLoad does not work.

玩得开心！

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