ipad - 检测 iPad 键盘隐藏按钮

Question

嗨，有什么方法可以检测 iPad 键盘隐藏按钮吗？我的意思是当用户按下这个按钮时:



有事要发生!

Answer 1

我不确定你想完成什么，但也许这可以帮助你:注册 NSNotificationCenter接收 UIKeyboardWillHideNotification 和/或 UIKeyboardDidHideNotification。

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(myKeyboardWillHideHandler:)
                                             name:UIKeyboardWillHideNotification
                                           object:nil];

...

- (void) myKeyboardWillHideHandler:(NSNotification *)notification {
    NSLog(@"Keyboard wants to hide. What a coward.");
}