ios-在animateTransition中从未调用UIView.animateWithDuration的交互式转换完成块
我使用自定义交互式pop转换和平移手势识别器。我有UIPercentDrivenInteractiveTransition中用于处理用户操作的子类:ios-在animateTransition中从未调用UIView.animateWithDuration的交互式转换完成块,ios,transitions,animator,Ios,Transitions,Animator,我使用自定义交互式pop转换和平移手势识别器。我有UIPercentDrivenInteractiveTransition中用于处理用户操作的子类: class InteractiveTransitionManager: UIPercentDrivenInteractiveTransition { var viewController: UIViewController? var interactive: Bool = false var popInProgress = fals
class InteractiveTransitionManager: UIPercentDrivenInteractiveTransition {
var viewController: UIViewController?
var interactive: Bool = false
var popInProgress = false
var startX: CGFloat = 0
init(viewController: UIViewController) {
super.init()
self.viewController = viewController
self.viewController?.view.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: "handlePan:"))
}
func handlePan(pan: UIPanGestureRecognizer) {
if pan.velocityInView(pan.view!.superview!).x > 0 && !popInProgress {
popInProgress = true
interactive = true
startX = pan.locationInView(pan.view!.superview!).x
viewController?.navigationController?.popViewControllerAnimated(true)
return
}
let curX = pan.locationInView(pan.view!.superview!).x
let progress: CGFloat = max(0, curX - startX) / pan.view!.frame.width
if pan.state == .Changed {
updateInteractiveTransition(progress)
} else if pan.state == .Ended || pan.state == .Cancelled {
if progress > 0.5 {
finishInteractiveTransition()
} else {
cancelInteractiveTransition()
}
popInProgress = false
interactive = false
}
}
}
我有InteractivePoptTransition类用于过渡动画:
class InteractivePopTransition: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
return 0.3
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
let fromVC = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!
let toVC = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!
let containterView = transitionContext.containerView()
let targetFrame = transitionContext.finalFrameForViewController(toVC)
toView.frame = CGRect(x: -targetFrame.size.width, y: targetFrame.origin.y, width: targetFrame.width, height: targetFrame.height)
containterView?.insertSubview(toView, belowSubview: fromView)
UIView.animateWithDuration(transitionDuration(transitionContext), animations: {
toView.frame = targetFrame
fromView.frame.origin.x = CGRectGetMaxX(targetFrame)
}, completion: { b in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
})
}
}
我有一个问题,UIView.animateWithDuration中的完成块有时未调用。为什么会发生这种情况以及如何修复它?当调用
animateTransition(transitionContext:)
且用户交互不是交互式的(如编程动画触发器),系统和ui视图似乎存在计时问题。不调用animateWithDuration
的完成,就像你描述的那样
我在工作中遇到过这种情况,我能够通过在调用UIView.animateWithDuration(…)
之前,从animateTransition(transitionContext:)
中显式调用uipercentDrivenInteractivateTransition
对象上的finishInteractivateTransition
来解决这个问题
这对于我的案例来说是一个简单的解决方案,因为我的UIViewControllerAnimatedTransitioning
对象有一个uipercentdriventeractivetransition
子类的实例,我公开了一个interactionprogress
属性来确定何时应该显式调用finishInteractiveTransition
如果在交互转换对象上显式调用finishInteractiveTransition
,则将调用完成块
class InteractivePopTransition: NSObject, UIViewControllerAnimatedTransitioning {
private var interactiveTransitionManager: InteractiveTransitionManager
...
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
...
if !interactiveTransitionManager.isInProgress {
// Weird state where system is telling you to animate a transition, but there
// is no interactive transition occurring. Manually finish the non-existant
// interactive transition so system will call other animation callbacks
// appropriately to complete the entire transition
interactiveTransitionManager.finish()
}
UIView.animateWithDuration(...)
}
}
另一种解决方案是将UIView.animateWithDuration
以较小的延迟放入调度异步块中