Prevent UIButton's setTitle:forState: animatio

问题:

This question already has answers here:

How to stop unwanted UIButton animation on title change? (24 answers)

Closed 3 years ago.

I am using a NSTimer to update a UIButton's title every second.

It works but the text in the title blinks (animates to alpha 0 and back) automatically.

I tried to use button.layer.removeAllAnimations() with no luck, and no exceptions, so QuartzCore seems to be correctly linked.

---

Current non-working paranoid code:

UIView.setAnimationsEnabled(false)
UIView.performWithoutAnimation {
    button.setTitle(time, forState: .Normal)
    button.layer.removeAllAnimations()
        }
UIView.setAnimationsEnabled(true)

回答1:

Make sure your button is a "custom" button and not a "system" button.

If you created it on a storyboard, then just change the Button Type. If you created it programmatically, then it should be:

UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];

回答2:

I’ve made a Swift extension to do this:

extension UIButton {
    func setTitleWithOutAnimation(title: String?) {
        UIView.setAnimationsEnabled(false)

        setTitle(title, forState: .Normal)

        layoutIfNeeded()
        UIView.setAnimationsEnabled(true)
    }
}

Works for me on iOS 8 and 9, with UIButtonTypeSystem.

回答3:

You can perform Button changes inside the closure:

UIView.performWithoutAnimation {
    //Button changes
    button.layoutIfNeeded()
}

Hope this helps.