UIScrollView programmatically Scrolling

Question

I have a UITextView inside a UIScrollView that needs to automatically scroll once the user starts editing it. This is because the keyboard will cover the textview.

Here is the code -

In viewDidLoad:

feedBackformView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, segmentedControl.frame.origin.x + self.segmentedControl.frame.size.height, self.view.frame.size.width, self.view.frame.size.height)];
feedBackformView.backgroundColor = [UIColor whiteColor];
feedBackformView.scrollEnabled = YES;
feedBackformView.delegate = self;
feedBackformView.userInteractionEnabled = YES;
feedBackformView.showsVerticalScrollIndicator = YES;
feedBackformView.contentSize = CGSizeMake(320, 700);

commentsView = [[UITextView alloc] initWithFrame:CGRectMake(5, emailField.frame.origin.y + 40, 250, 150)];
commentsView.delegate = self;
commentsView.layer.borderWidth = 2.0f;
commentsView.layer.cornerRadius = 5;

and here's the delegate method implementation -

-(void)textViewDidBeginEditing:(UITextView *)textView{
    CGPoint point = textView.frame.origin;
    [scrollView setContentOffset:point animated:YES];
}

However, nothing happens.

what happens when you try to scroll with scrollRectToVisible. — guenis, Apr 18 '13 at 02:13

score 4 · Accepted Answer · answered Apr 18 '13 at 04:49

your are doing fine but use feedBackformView instead of scrollView,while setting content offset in textViewDidBeginEditing:method, just have a look on below code

feedBackformView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 50, 320, 200)];
feedBackformView.backgroundColor = [UIColor whiteColor];
feedBackformView.scrollEnabled = YES;
feedBackformView.delegate = self;
feedBackformView.userInteractionEnabled = YES;
feedBackformView.showsVerticalScrollIndicator = YES;
feedBackformView.contentSize = CGSizeMake(320, 700);

commentsView = [[UITextView alloc] initWithFrame:CGRectMake(5, 40, 250, 150)];
commentsView.delegate = self;
commentsView.layer.borderWidth = 2.0f;
commentsView.layer.cornerRadius = 5;

[feedBackformView addSubview:commentsView];
[self.view addSubview:feedBackformView];

in textview DelegateMethod,

-(void)textViewDidBeginEditing:(UITextView *)textView{
  CGPoint point = textView.frame.origin;
  [feedBackformView setContentOffset:point animated:YES];
 }

hope it will hepls you...

score 1 · Answer 2 · answered Apr 18 '13 at 03:22

You can use scrollView scrollRectToVisible:animated or the setContentOffset:animated methods described here: UIScrollView Class Reference

Keep in mind that UITextView comes with its own scroll view. so you may not need to nest it inside another scrollview. But you may need to if your app is that interesting.

score 1 · Answer 3 · answered Apr 18 '13 at 03:34

Is your point of scrolling already at a visible point?

-(void)textViewDidBeginEditing:(UITextView *)textView{
    // try this instead
    CGPoint point = CGPointMake(textView.frame.origin.x, 
                                textView.frame.origin.y + textView.frame.size.height);
    [scrollView setContentOffset:point animated:YES];

    // What does this produce?
    NSLog(@"%@ %@", NSStringFromCGPoint(scrollView.contentOffset),
                    NSStringFromCGRect(textView.frame));
}

UIScrollView programmatically Scrolling

3 Answers3