利用通知监测键盘高度

最新推荐文章于 2021-08-17 19:44:22 发布

原创最新推荐文章于 2021-08-17 19:44:22 发布 · 438 阅读

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本文介绍iOS中如何使用系统提供的键盘通知来监听键盘显示、隐藏及尺寸变化，并展示了如何通过这些通知调整应用界面布局。

 
//键盘的frame发生改变时发出的通知（位置和尺寸）

UIKeyboardWillChangeFrameNotification

 UIKeyboardDidChangeFrameNotification

 //键盘显示时发出的通知

 UIKeyboardWillShowNotification

 UIKeyboardDidShowNotification

 //键盘隐藏时发出的通知

 UIKeyboardWillHideNotification

 UIKeyboardDidHideNotification

//添加观察者
 监听键盘变化

- (void)viewDidLoad {

    [super viewDidLoad];

    [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(action:)name:UIKeyboardDidChangeFrameNotificationobject:nil];

}

//监听执行方法

- (void)action:(NSNotification *)notification{

    NSLog(@"%@",notification.userInfo);

NSLog(@"%@",notification.userInfo[@"UIKeyboardFrameEndUserInfoKey"]);

    //键盘的frame

    CGRect rect = [notification.userInfo[@"UIKeyboardFrameEndUserInfoKey"]CGRectValue];
  
}

//输出键盘动画时间

NSLog(@"%f",[notification.userInfo[@"UIKeyboardAnimationDurationUserInfoKey"]floatValue]);

//userInfo打印出来的信息

 {

    UIKeyboardAnimationCurveUserInfoKey = 7;

    UIKeyboardAnimationDurationUserInfoKey = "0.25";

    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {414, 271}}";

    UIKeyboardCenterBeginUserInfoKey = "NSPoint: {207, 871.5}";

    UIKeyboardCenterEndUserInfoKey = "NSPoint: {207, 600.5}";

    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 736}, {414, 271}}";

    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 465}, {414, 271}}";

    UIKeyboardIsLocalUserInfoKey = 1;

}

CGRect rect = [NSRect:
 {{0, 465}, {414, 271}} 
CGRectValue];转化对象