动画 UIButton 状态变化

问题描述

我正在使用带有图像的 UIButton 用于正常和突出显示状态.它们按预期工作，但我希望进行一些淡入淡出/合并过渡，而不仅仅是突然交换.

I'm using a UIButton with images for normal and highlighted states. They work as expected but I want to have some fading/merging transition and not just a sudden swap.

我该怎么做?

推荐答案

这可以使用 UIView 的过渡动画来完成.isHighlighted 属性不是动画并不重要，因为它会转换整个视图.

This can be done using transition animation of a UIView. It does not matter the isHighlighted property is not animatable, because it transitions the whole view.

UIView.transition(with: button,
                  duration: 4.0,
                  options: .transitionCrossDissolve,
                  animations: { button.isHighlighted = true },
                  completion: nil)

目标-C

[UIView transitionWithView:button
                  duration:4.0
                   options:UIViewAnimationOptionTransitionCrossDissolve
                animations:^{ button.highlighted = YES; }
                completion:nil];

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