Swift - 连续背景动画循环 [英] Swift - Continuous background animation loop

问题描述

有人可以指出我如何制作 UIimageviews alpha 属性的无限循环动画的方向.从 0 - 1、1 - 0 开始.我对 iOS 和编程还很陌生，所以这可能听起来很愚蠢.如果不将整个应用程序置于无限循环中，我将如何实现这一点.

Can someone point me in the direction of how i'd go about making a endless loop animation of a UIimageviews alpha property. From the 0 - 1, 1 - 0. I'm fairly new to iOS and programming in general so this may sound dumb. How would I accomplish this without putting the entire app in an endless loop.

推荐答案

连续动画 我不认为这是移动应用程序中的好做法，也许我自己错了.无论如何，您可以尝试以下操作

Continuous animation I don't think this is a good practice in mobile applications, maybe myself wrong. Anyways you can try something like below

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    self.customView.backgroundColor = UIColor(red: 0.0, green: 255.0 , blue: 255.0, alpha: 1.0)
    dispatch_async(dispatch_get_main_queue(), {
        self.performAnimation()

    })

}

func performAnimation() {

    UIView.animateWithDuration(2.0, delay: 0.5, options: .CurveEaseOut | .Repeat | .Autoreverse, animations: {
        self.customView.alpha = 0.0
        }, completion: nil)

}

customView 是我的 UIView，您可以类似地创建您的 UIImageView.

Where customView is my UIView, you can create your UIImageView similarly.

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