objective-c : 키보드 나타날 때 텍스트 뷰 사이즈 조정

snippet.m

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    //키보드 옵저버
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:)
                                                 name:UIKeyboardDidShowNotification object:self.view.window];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification object:self.view.window];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    [[NSNotificationCenter defaultCenter] removeObserver:self]; //키보드 옵저버 해제
}

#pragma mark - 키보드 팝업 (텍스트 뷰 사이즈 조정)

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

        NSDictionary* d = [notification userInfo];

        CGRect r = [[d objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
        NSNumber* curve = [d objectForKey:UIKeyboardAnimationCurveUserInfoKey];
        NSNumber* duration = [d objectForKey:UIKeyboardAnimationDurationUserInfoKey];
        r = [self.view convertRect:r fromView:nil];

        CGRect f = self.noteTextView.frame;

        self->oldFrame = f;

        f.size.height = self.view.frame.size.height - f.origin.y - r.size.height; [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:[duration floatValue]];
        [UIView setAnimationCurve:[curve intValue]];
        self.noteTextView.frame = f;
        [UIView commitAnimations];
    
}


- (void)keyboardWillHide:(NSNotification*)notification {
        
        NSDictionary* d = [notification userInfo];

        NSNumber* curve = [d objectForKey:UIKeyboardAnimationCurveUserInfoKey];
        NSNumber* duration = [d objectForKey:UIKeyboardAnimationDurationUserInfoKey];
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:[duration floatValue]];
        [UIView setAnimationCurve:[curve intValue]];
        self.noteTextView.frame = self->oldFrame;
        [UIView commitAnimations];

}