键盘弹出获取高度

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

-(void)KeyboardWillShow:(NSNotification *)notification

{

    NSDictionary *info = [notification userInfo];

    

    //获取高度

    NSValue *value = [info objectForKey:@"UIKeyboardBoundsUserInfoKey"];//关键的一句，网上关于获取键盘高度的解决办法，多到这句就over了。系统宏定义的UIKeyboardBoundsUserInfoKey等测试都不能获取正确的值。不知道为什么。。。

    

    CGSize keyboardSize = [value CGRectValue].size;

    float keyboardHeight = keyboardSize.height;

    

    // 获取键盘弹出的时间

    NSValue *animationDurationValue = [[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey];

    NSTimeInterval animationDuration;

    [animationDurationValue getValue:&animationDuration];

    

    //自定义的frame大小的改变的语句    

}