ios动态获取键盘高度

iOS的键盘由于类型多样，机型也多样，不同机型的同类键盘高度也不一样。如果我们要根据键盘高度来放置一些控件，那么动态获取键盘的高度就变得很有必要，比如像QQ一样，在键盘上放一个输入框，或放一个收键盘的按钮之类。下面直接上方法

- (void)viewDidLoad {

[super
viewDidLoad];

// Do any additional setup after loading the view.

[[NSNotificationCenter
defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:) name:UIKeyboardWillShowNotification
object:nil];

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

}

//每次键盘将要出现时都会调用这个方法

- (void) keyboardWasShown:(NSNotification *) notification

{

NSDictionary *info = [notification userInfo];

NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

CGSize keyboardSize = [value CGRectValue].size;

//键盘高度

NSLog(@"keyBoard:%f", keyboardSize.height);

在这里可以将需要出现的输入框之类用动画的升起来，键盘出现的时间好像是0.25秒

}

//每次键盘将要消失时都会调用这个方法

- (void) keyboardWasHidden:(NSNotification *)
notification

{

NSDictionary *info = [notification userInfo];

NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

CGSize keyboardSize = [value CGRectValue].size;

NSLog(@"keyboardWasHidden keyBoard:%f", keyboardSize.height);

}