Ios 如何检测键盘何时显示和隐藏

发布于12月07日

如何检测键盘在应用程序中的显示和隐藏时间？

推荐答案

在设置为侦听有关键盘的消息的类的ViewDidLoad方法中:

// Listen for keyboard appearances and disappearances
[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(keyboardDidShow:)
                                             name:UIKeyboardDidShowNotification
                                           object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardDidHide:)
                                             name:UIKeyboardDidHideNotification
                                           object:nil];

然后在您指定的方法中(在本例中为keyboardDidShow和keyboardDidHide)，您可以对此做一些事情:

- (void)keyboardDidShow: (NSNotification *) notif{
    // Do something here
}

- (void)keyboardDidHide: (NSNotification *) notif{
    // Do something here
}