如何使用swift设置不透明度动画？ [英] How do I animate opacity using swift?

问题描述

有人可以给我提供一个示例，以动画方式快速显示图像视图吗？

Could someone please provide me with an example of animating the opacity of an Image View in swift??

我什至在物镜c中都找不到很好的例子

I couldn't even find a good example in objective c

func showCorrectImage(element: AnyObject){

    var animation : CABasicAnimation = CABasicAnimation(keyPath: "opacity");

    animation.delegate = self

    animation.fromValue = NSValue(nonretainedObject: 0.0)
    animation.toValue = NSValue(nonretainedObject: 1.0)

    animation.duration = 1.0

    element.layer?.addAnimation(animation, forKey: nil)
}

我想我拥有大部分的权利（虽然不确定），有人可以帮我吗？

I think I have most of this right (not completely sure though), could someone please help me?

element =图像视图

element = an Image View

谢谢！〜

推荐答案

如果您需要简单的动画，为什么不只使用UIView的 animateWithDuration：animations：方法？

If you need a simple animation, why not just use UIView's animateWithDuration:animations: method?

imageView.alpha = 0
UIView.animateWithDuration(1.0) {
        imageView.alpha = 1
}

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