问题描述
我想注册 UIKeyboardDidHideNotification 只有我的UIViewController正在发行。
I want to register to UIKeyboardDidHideNotification that only my UIViewController is issuing.
当我这样做时：
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:self];
我没有接到任何电话 keyboardDidHide：当我这样做时：
I'm not getting any calls to keyboardDidHide: and when I do :
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
我正在接收来自所有其他视图控制器的呼叫以及我自己的呼叫。
I'm getting calls from all the other view controller as well as my own.
如何注册仅由特定视图控制器引发的 UIKeyboardDidHideNotification ？
How can I register to the UIKeyboardDidHideNotification raised only by a specific view controller ?
推荐答案
您无法注册来自特定控制器的UIKeyboardDidHideNotification。
You have no way to register for a UIKeyboardDidHideNotification coming from a specific controller.
如果使用UIKeyboardWillHideNotification，您可以检查控制器中的其中一个UITextView是否是第一个响应者。
If using UIKeyboardWillHideNotification, you could check if one of the UITextView inside your controller is the first responder.
使用UIKeyboardDidHideNotification我猜你需要为所有UITextView使用委托方法并保存最后编辑过的方法。我没有想到任何其他选择。
Using UIKeyboardDidHideNotification I guess you need to use delegate methods for all your UITextView and save the last one that was edited. I don't think of any other alternative.
否则，如果问题是仅在可见控制器上执行UIKeyboardDidHideNotification调用的方法，@ sviatoslav-yakymiv的解决方案效果很好。
Else, if the issue is to perform the method called by UIKeyboardDidHideNotification only on the visible controller, the solution by @sviatoslav-yakymiv works well.
这篇关于谁发出我的UIKeyboardDidHideNotification？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！