Open Radar

 
Summary:
The frame of a buttons `titleLabel` reports an incorrect value after `setTitle: forState:` is called.

This is only an issue when using Auto Layout to position the button within a view.

Steps to Reproduce:
- Open & run UIButton-Issue sample project.
- See the button layout is correct with a correct value printed to the console.
- Tap the only button on the view.
- See the incorrect width of the `titleLabel` logged to the console.
- Tap the button again and see an incorrect layout matched with incorrect `titleLabel` width printed in the console.
- Now toggle on the "Apply fix" switch.
- Tap the button again and see the correct layout with correct width of the `titleLabel`.
- Tap the button again so the button's title is set to the shorter text and see the correct widths again.

Expected Results:
The frame of the `titleLabel` of the button should report the correct frame after a title is set.

Actual Results:
The frame of the `titleLabel`reports incorrect values when queried after setting the title of the button.

Version:
iOS 8.1 & 9.3

Notes:


Configuration:
iPhone simulator

Attachments:
'UIButton-Issue.zip', 'UIButton-issue.gif' and 'UIButton-issue.mov' were successfully uploaded.

Potential fix:
Remove the animation of setting the title and force a layout before redrawing view.

```
override func setTitle(title: String?, forState state: UIControlState) {
    UIView.performWithoutAnimation { () -> Void in
        super.setTitle(title, forState: state)
        self.layoutIfNeeded()
        self.setNeedsDisplay()
    }
}
```