iOS特效之破碎的ViewController

正文

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使用苹果提供的自定义ViewController过渡动画技术，可以很方便的将BrokenGlassEffectView植入到过渡动画中。将要被dismiss掉的ViewController渲染到一张图片上，传递给BrokenGlassEffectView，然后使用这张图片做破碎的动画，这样就可以产生ViewController破碎的效果了。

实现自定义ViewController过渡动画

想要实现自定义过渡动画，首先要实现一个动画管理类，这个类控制着过渡动画如何进行。本文的动画控制类在BrokenGlassTransitionAnimator.swift中。下面是动画的核心代码。

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

let containerView = transitionContext.containerView

guard let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),

let toVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to) else {

return

}

let snapshotImage = createImage(layer: fromVC.view.layer)

let brokenGlassView = BrokenGlassEffectView.init(frame: fromVC.view.bounds)

fromVC.view.removeFromSuperview()

containerView.addSubview(toVC.view)

containerView.addSubview(brokenGlassView)

brokenGlassView.setImageForBroke(image: snapshotImage)

brokenGlassView.beginBroke()

DispatchQueue.main.asyncAfter(deadline: .now() + 1.2) { [weak brokenGlassView] in

brokenGlassView?.removeFromSuperview()

brokenGlassView?.destroy()

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