动态获取键盘高度

当你需要根据键盘高度缩小视图的高度时，首先为监控键盘设置观察者 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardFrameChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

然后设置函数

- (void)keyboardFrameChange:(NSNotification *) notif

{

　　NSDictionary *info = [notif userInfo];

   　NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];//键盘frame的value值

   　//做你需要的处理CGSize keyboardSize = [value CGRectValue].size;

}