我试图使用 Swift 协议(protocol)提供 UIViewControllerAnimatedTransitioning
的通用实现,但每当我有一个符合该协议(protocol)的对象时,我都会收到错误:
Command failed due to signal: Segmentation fault: 11
当删除泛型时,我仍然遇到问题。
这是我的协议(protocol),其中泛型被注释掉:
protocol TransitionControllerType: UIViewControllerAnimatedTransitioning {
// typealias PresentingViewController: UIViewController
// typealias PresentedViewController: UIViewController
var isPresentation: Bool { get set }
var presentationTransitionDuration: NSTimeInterval { get }
var dismissTransitionDuration: NSTimeInterval { get }
func prepareViewControllerForPresentation(viewController: UIViewController, presentingViewController: UIViewController)
func presentViewController(viewController: UIViewController, presentingViewController: UIViewController)
func dismissViewController(viewController: UIViewController, presentingViewController: UIViewController)
}
PresentingViewController
和 PresentedViewController
只是代替 prepareViewController(::)
中的 UIViewController
,presentViewController(::)
和 dismissViewController(::)
。
我在 TransitionControllerType
的扩展中提供了 UIViewControllerAnimatedTransitioning
的实现:
extension TransitionControllerType {
func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
return isPresentation ? presentationTransitionDuration : dismissTransitionDuration
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
// Ensure there is a container view
guard let containerView = transitionContext.containerView() else {
return
}
// Get the view controllers
let (fromViewController, toViewController) = transitionContext.viewControllers()
// // Cast the view controllers
// guard let presentedViewController = (isPresentation ? toViewController : fromViewController) as? PresentedViewController,
// let presentingViewController = (isPresentation ? fromViewController : toViewController) as? PresentingViewController
// else {
// return
// }
guard let presentedViewController = (isPresentation ? toViewController : fromViewController),
let presentingViewController = (isPresentation ? fromViewController : toViewController)
else {
return
}
// Get the views from the view controllers
let presentedView = presentedViewController.view
let presentingView = presentingViewController.view
// If it's a presentation, prepare the view controllers
if isPresentation {
prepareViewControllerForPresentation(presentedViewController, presentingViewController: presentingViewController)
containerView.addSubview(presentedView)
}
UIView.animateWithDuration(
transitionDuration(transitionContext),
delay: 0,
usingSpringWithDamping: isPresentation ? PresentationSpringDamping : DismissSpringDamping,
initialSpringVelocity: isPresentation ? PresentationSpringVelocity : DismissSpringVelocity,
options: isPresentation ? UIViewAnimationOptions.CurveEaseOut : [],
animations: {
if self.isPresentation {
self.presentViewController(presentedViewController, presentingViewController: presentingViewController)
} else {
self.dismissViewController(presentedViewController, presentingViewController: presentingViewController)
}
},
completion: { success in
transitionContext.completeTransition(success)
// !!!: We have to manually add `presentationView` due to a bug
// http://openradar.appspot.com/radar?id=5320103646199808
if !self.isPresentation {
UIApplication.sharedApplication().keyWindow?.addSubview(presentingView)
} else {
UIApplication.sharedApplication().keyWindow?.addSubview(presentedView)
}
})
}
func prepareViewControllerForPresentation(viewController: UIViewController, presentingViewController: UIViewController) { }
func presentViewController(viewController: UIViewController, presentingViewController: UIViewController) { }
func dismissViewController(viewController: UIViewController, presentingViewController: UIViewController) { }
}
此时尝试运行项目将导致构建成功。
如果我尝试在 NSObject
上实现协议(protocol)(为了符合 UIViewControllerAnimatedTransitioning
),我会收到段错误错误。
下面是我在呈现 AddNewMenuViewController
时用于 transitioningDelegate
的类,以及
TransitionControllerType
class AddNewMenuTransitionControllerDelegate: NSObject, UIViewControllerTransitioningDelegate {
func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? {
return AddNewMenuPresentationController(presentedViewController: presented, presentingViewController: presenting, blurStyle: .Dark)
}
func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return AddNewMenuTransitionController(presentation: true)
}
func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return AddNewMenuTransitionController()
}
}
class AddNewMenuTransitionController: NSObject, TransitionControllerType {
var isPresentation: Bool
var presentationTransitionDuration: NSTimeInterval = 0.3
var dismissTransitionDuration: NSTimeInterval = 0.3
init(presentation: Bool = false) {
self.isPresentation = presentation
super.init()
}
}
为什么非通用版本会导致与通用版本相同的段错误?
最佳答案
当尝试确定您的 AddNewMenuTransitionController 类是否满足 UIViewControllerAnimatedTransitioning 协议(protocol)(这是您声明 TransitionControllerType 所必需的)时,我认为编译器无法识别通过扩展 TransitionControllerType 协议(protocol)添加的 animateTransition 的默认方法实现。
这对编译器的要求可能有点高,因为它本质上需要使用 TransitionControllerType 的默认实现来预先构建方法列表,同时它正在验证方法是否满足其要求之一。
如果您在 TransitionControllerType 的定义中不需要 UIViewControllerAnimatedTransitioning 而是将其显式添加到您的类定义中,则这可能会起作用(但我还没有尝试过)。
我确信这并不像您想要的那么干净,但是使用中间协议(protocol)的方法的间接默认实现目前对于编译器来说似乎太多了。
关于ios - 扩展 UIViewControllerAnimatedTransitioning 时出现段错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34732921/