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Editorial Team
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Asked: 2026-05-16T02:02:39+00:00

I have a UITextView with scrolling disabled, and I am using the page-curl transition

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I have a UITextView with scrolling disabled, and I am using the page-curl transition to change the text inside. This is the code I’m using:

myView.text = nextString;

[UIView transitionWithView:myView duration:PAGE_CURL_DURATION options:UIViewAnimationOptionTransitionCurlDown animations:nil completion:nil];

Everything works fine, except if the new text string has more lines than the old one, it will be clipped until the animation is complete. It looks as though the contentSize is changing AFTER the animation. I tried adding myView.contentSize = myView.bounds.size; but that didn’t change anything. I also turned off “clip subviews” to no avail.

This is what it looks like immediately after the animation:
alt text

a moment later the text is no longer clipped.

Any ideas how to prevent clipping?

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1 Answer

  1. Editorial Team

    The easy way is to do what Bjarne said – use the clipsToBounds property. But watch out – this will make the text expand downwards indefinitely. So you will also need to surround your text field with a container view that DOES clip to bounds to set an upper limit.

    If that doesn’t do the trick, you will have to do some work to manually expand your text view’s bounds and reposition it before animating if the new text is larger.

    To get the size of a text, check out UIStringDrawing.h in the UIKit framework. Specifically, I’m thinking of using:
    – (CGSize)sizeWithFont:(UIFont *)font forWidth:(CGFloat)width lineBreakMode:(UILineBreakMode)lineBreakMode;
    together with UILineBreakModeWordWrap.

    another alternative to getting the size may be this function in UILabel:
    – (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines;
    and passing in the bounds of the largest possible text view.

    For extra credit, you may also want to consider animating the change in your view’s bounds for a smoother transition.

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