键盘弹起与隐藏时高度的获取及动画 适配所有iOS系统

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    //监听键盘事件

    if ([[[UIDevice currentDevice] systemVersion] compare:@"5.0"] < 0) {

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChangeCallBack:) name:UIKeyboardWillShowNotification object:nil];//键盘弹出事件

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChangeCallBack:) name:UIKeyboardWillHideNotification object:nil];//键盘收起事件

    } else {//5.0.X回应changeFrame事件，5.1.x回应willShow事件和changeFrame事件，

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChangeCallBack:) name:UIKeyboardWillShowNotification object:nil];//键盘弹出事件

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChangeCallBack:) name:UIKeyboardWillChangeFrameNotification object:nil];//键盘区域变更事件

    }

    if ([CustomView canBecomeFirstResponder] && ![CustomView isFirstResponder]) {

        [CustomView becomeFirstResponder];

    }

}

//键盘事件回调

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

    NSDictionary *userInfo = [notification userInfo];

    CGRect keyboardFrame = [[userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    CGFloat keyboardDuration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

    UIViewAnimationCurve keyboardCurve = [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];

    

    [UIView beginAnimations:@"keyboardAnimation" context:nil];

    [UIView setAnimationBeginsFromCurrentState:TRUE];

    [UIView setAnimationDuration:keyboardDuration];

    [UIView setAnimationCurve:keyboardCurve];

    CGRect textViewRect = CustomView.frame;

    textViewRect.size.height = CGRectGetMinY(keyboardFrame) - 40 - CGRectGetHeight(self.navigationController.navigationBar.frame);

    CustomView.frame = textViewRect;

    [UIView commitAnimations];

}