[iOS Objective-C] Keyboard Delegate받아서 애니메이션하기

키보드 올라오는 Delegate받기

- (void)viewDidAppear:(BOOL)animated {
    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
    [center addObserver:self selector:@selector(keyboardOnScreen:) name:UIKeyboardWillShowNotification object:nil];
    [center addObserver:self selector:@selector(keyboardHideScreen:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)viewDidDisappear:(BOOL)animated {
    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
    [center removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [center removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

#pragma mark - 키보드
-(void)keyboardOnScreen:(NSNotification *)notification {
    //...
}
-(void)keyboardHideScreen:(NSNotification *)notification {
    //...
}

- (void) viewDidAppear:(BOOL)animated ; 는 화면이 나타나기 바로직전에 호출되는 함수이고

- (void) viewDidDisappear:(BOOL)animated ; 는 화면이 없어지기 바로 직전에 호출되는 함수이다.

viewDidAppear에 "키보드 올라오면 말해주세요" 용도의 노티피케이션을 설정하고

viewDidDisappear에 "아까 등록한 노티피케이션을 지워주세요"라고 설정한다.

#pragma mark - 키보드
-(void)keyboardOnScreen:(NSNotification *)notification {
    NSDictionary *info  = notification.userInfo;
    NSValue      *value = info[UIKeyboardFrameEndUserInfoKey];
    
    CGRect rawFrame      = [value CGRectValue];
    CGRect keyboardFrame = [self.view convertRect:rawFrame fromView:nil]; /*키보드 프레임*/

    NSDictionary *userInfo = notification.userInfo;
    NSNumber *durationValue = userInfo[UIKeyboardAnimationDurationUserInfoKey];  /*키보드가 올라오는 동안의 시간*/
    NSTimeInterval animationDuration = durationValue.doubleValue;
    NSNumber *curveValue = userInfo[UIKeyboardAnimationCurveUserInfoKey];       /*키보드 애니메이션 옵션 효과 (ease)*/
    UIViewAnimationCurve animationCurve = curveValue.intValue;
    
    [UIView animateWithDuration:animationDuration delay:0.f options:animationCurve<<16 animations:^{
        // ...
    } completion:nil];
}

-(void)keyboardHideScreen:(NSNotification *)notification {
    NSDictionary *userInfo = notification.userInfo;
    NSNumber *durationValue = userInfo[UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration = durationValue.doubleValue;
    NSNumber *curveValue = userInfo[UIKeyboardAnimationCurveUserInfoKey];
    UIViewAnimationCurve animationCurve = curveValue.intValue;


    
    [UIView animateWithDuration:animationDuration delay:0.f options:animationCurve<<16 animations:^{
        // ...
    } completion:nil];
}

// ... 부분에 애니메이션 코드를 넣어주면 키보드에서와 동일한 애니메이션 ease가 연출된다.