自定义展开 segue 在 iOS11 中崩溃

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玩这个我发现如果我从提供的控制器执行此操作，一切都会按预期工作：

self.dismiss(animated: true)

并执行自定义转场的动画。但是，如果我尝试使用这样的展开转场：

self.performSegue(withIdentifier: "logoDisplayed", sender: self)

然后我得到下面提到的崩溃。我还发现自定义转场仅在我将 'kind' 设置为 'Present modally' 时才有效。如果我将它设置为 'Custom' 然后我再次得到崩溃告诉我没有 perform() 即使显然有。

还在想办法解决这个问题。

原版Post

我知道这个之前已经谈过了(here, here and here)

但我无法在 iOS11 中使用自定义展开转场。下面是我正在使用的自定义转场。当我将它设置为模型 segue 的 class 时它工作得很好，但当我将它设置为 unwind segue 的 class 时它不起作用。相反，应用程序崩溃并出现此错误：

2017-11-20 22:29:09.640934+1100 Crux[46709:6046351] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
reason: 'Could not perform segue with identifier 'logoDisplayed'. 
A segue must either have a performHandler or it must override -perform.'
*** First throw call stack:
(
0   CoreFoundation                      0x00000001100c012b __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x000000010f06bf41 objc_exception_throw + 48
2   UIKit                               0x0000000111c1061d -[UIStoryboardSegue _prepare] + 0
3   Crux                                0x000000010dacecc8 _T04Crux13AnimatedSegueC7performyyF + 280
...

segue 的设置如下：

我的 segue 代码是这样的：

class FadeInAnimator: NSObject, UIViewControllerAnimatedTransitioning {

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 2.0
    }

    func animateTransition(using transitionContext:      UIViewControllerContextTransitioning) {

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

        containerView.addSubview(toVC!.view)
        toVC!.view.alpha = 0.0

        let duration = transitionDuration(using:transitionContext)
        UIView.animate(withDuration:duration,
                       animations: {
                        toVC!.view.alpha = 1.0
        },
                       completion: { finished in
                        let cancelled = transitionContext.transitionWasCancelled
                        transitionContext.completeTransition(!cancelled)
        })
    }
}

class AnimatedSegue:UIStoryboardSegue, UIViewControllerTransitioningDelegate {

    override func perform() {
        source.transitioningDelegate = self
        destination.transitioningDelegate = self
        super.perform()
    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return FadeInAnimator()
    }

    func animationController(forPresented presented: UIViewController,
                             presenting: UIViewController,
                             source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return FadeInAnimator()
    }
}

有人知道我可能哪里出错了吗？

Answer 1

找到问题了。我在源控制器中有一些旧代码：

override func segueForUnwinding(to toViewController: UIViewController, from fromViewController: UIViewController, identifier: String?) -> UIStoryboardSegue? {
    return AnimatedSegue(identifier: identifier, source: fromViewController, destination: toViewController)
}

正在调用并导致问题的。

自定义展开 segue 在 iOS11 中崩溃

Custom unwind segue crashing in iOS11

ios

uistoryboardsegue