Ios – Intrinsic size not updating when changing UIButton state

interface-builderiosiphoneobjective cuikit

I have a UIView that contains a UIButton. The UIButton has 2 titles set for the UIControlStateNormal ("Follow") and UIControlStateSelected ("Following") states. I am using auto layout on the UIButton and it has a constraint to be a certain distance from the top of the superview and another to be a certain distance from the left side of the superview. I've also used "Size to fit Content" on it.

When I set the button to be in the selected state from code, the title changes correctly but the intrinsic width of the UIButton doesn't change so that when changing from "Follow" to "Following" the text gets ellipsized.

self.selected = self.following;

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When I approach the problem differently and simply change the text for UIControlStateNormal when someone hits the button, the button changes size correctly.

NSString *title = (self.following) ? @"Following" : @"Follow"
[self setTitle:title forState:UIControlStateNormal];

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Is this a bug in UIKit? I would expect the button to change its intrinsic size to correctly reflect the new size of the text when its state changes especially because there are other things I would like to change besides just the text for the 2 button states.

Best Answer

Like David Caunt pointed out in a comment, calling invalidateIntrinsicContentSize will cause autolayout to resize the button to fit it's new content.

self.selected = self.following;
[self invalidateIntrinsicContentSize];

PS. David, if you want to post your commant as an answer I will remove mine.

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