处理键盘弹出

//======== 监听键盘的弹出事件 ========

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];



// 当键盘的位置大小发生改变时触发

- (void)keyboardWillChangeFrame:(NSNotification *)note

{

    // 1. 获取键盘当前的高度

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

    CGFloat screenH = [UIScreen mainScreen].bounds.size.height;

    CGRect rect = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

    CGFloat keyboardY = rect.origin.y;

    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    

    /// 2.将当前ViewController的View整体向上平移一个"键盘的高度"

    [UIView animateWithDuration:duration animations:^{

        self.view.transform = CGAffineTransformMakeTranslation(0, keyboardY - screenH);

    }];

    

}

 
///记得移除通知
- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}