- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

- (void)viewDidLoad 
{
    [super viewDidLoad];
    //键盘监控
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
/**
 *  键盘即将出现
 */
- (void)keyboardWillShow:(NSNotification *)notif
{
    NSDictionary *info = [notif userInfo];
    NSValue *value = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGSize keyboardSize = [value CGRectValue].size;

    double duration = [[info valueForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    [UIView animateWithDuration:duration animations:^{
        self.view.transform = CGAffineTransformMakeTranslation(0, -keyboardSize.height);
    }];
}

/**
 *  键盘即将消失
 */
- (void)keyboardWillHide:(NSNotification *)notif
{
    [UIView animateWithDuration:[[[notif userInfo] valueForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^{
        self.view.transform = CGAffineTransformIdentity;
    }];
}