ios开发之--键盘的监听

 // 监听键盘
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShowAction:) name:UIKeyboardWillShowNotification object:nil];

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

#pragma mark - 键盘处理

/**
 *  键盘即将隐藏
 */
- (void)keyboardWillHideAction:(NSNotification *)note
{
    
    // 1.键盘弹出需要的时间
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    
    // 2.动画
    [UIView animateWithDuration:duration animations:^{
        self.view.transform = CGAffineTransformIdentity;
    }];
}

/**
 *  键盘即将弹出
 */
- (void)keyboardWillShowAction:(NSNotification *)note
{
    
    // 1.键盘弹出需要的时间
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    
    // 2.动画
    [UIView animateWithDuration:duration animations:^{
        // 取出键盘高度
        CGRect keyboardF = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
        CGFloat keyboardH = keyboardF.size.height - 40;
        if (_ThreeInch) {
            self.view.transform = CGAffineTransformMakeTranslation(0, - keyboardH);
        } else {
            self.view.transform = CGAffineTransformMakeTranslation(0, - 50);
        }
    }];
}