使用UIStoryboardSegue自定义UIViewController的演示过渡

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最受欢迎的方式是 UIViewControllerAnimatedTransitioning

为了做到这一点，你必须：

  • 新建一个子类，该子类可称为 “XXXTransitioning”，继承自 “NSObject”，并实现协议 “UIViewControllerAnimatedTransitioning “的两个功能。
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval
func animateTransition(using transitionContext: UIViewControllerContextTransitioning)
  • Then:
    1. 在 “ViewController “中新建一个 “XXXTransitioning “的实例。
    2. 设置transitioningDelegate = self。
    3. 用 UIViewControllerTransitioningDelegate 扩展 “ViewController”，并实现。
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func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?

dismiss

我注意到 Storyboard Segue 有一个 Custom

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class XXXModalSegue: UIStoryboardSegue {
    override func perform() {
    	let fromVC = source
        let toVC = destination

        let fromView = fromVC.view!
        let toView  = toVC.view!

        let (w, h) = (UIScreen.main.bounds.width, UIScreen.main.bounds.height)

        toView.alpha = 0
        toView.frame = CGRect(x: w/2, y: 0, width: w, height: h)

        let window = UIApplication.shared.keyWindow
        window?.insertSubview(toView, aboveSubview: fromView)

        UIView.animate(withDuration: 0.4, animations: {
            toView.alpha = 1
            toView.frame = toView.frame.offsetBy(dx: -w/2, dy: 0)
        }) { (b) in

            self.source.present(self.destination, animated: false, completion: nil)
            // OR: self.source.dismiss(animated: false, completion: nil)
        s
    }
}

就是这样，不用再编码delegate和Extension。简单又干净：)

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