ios – Swift 3 为什么来自snapshotView的快照在iPhone 7 Plus模拟器中显示为空白？

概述我正在使用以下代码创建自定义菜单转换.我花了最后两个小时试图弄清楚为什么快照显示为空白(仅使用iPhone 7 Plus模拟器).但是当我想创建一个视频使其成为这个线程的gif时,它可以在我的iPhone 6S Plus上运行. 更新：适用于iPhone 6S模拟器.但仍然没有在7 Plus. import UIKitclass PresentMenuAnimator : NSObject { 我正在使用以下代码创建自定义菜单转换.我花了最后两个小时试图弄清楚为什么快照显示为空白(仅使用iPhone 7 Plus模拟器).但是当我想创建一个视频使其成为这个线程的gif时,它可以在我的iPhone 6S Plus上运行.

更新：适用于iPhone 6S模拟器.但仍然没有在7 Plus.

import UIKitclass PresentMenuAnimator : NSObject {}extension PresentMenuAnimator : UIVIEwControllerAnimatedTransitioning {    func TransitionDuration(using TransitionContext: UIVIEwControllerContextTransitioning?) -> TimeInterval {        return 0.6    }    func animateTransition(using TransitionContext: UIVIEwControllerContextTransitioning) {        let fromVC = TransitionContext.vIEwController(forKey: UITransitionContextVIEwControllerKey.from)        let toVC = TransitionContext.vIEwController(forKey: UITransitionContextVIEwControllerKey.to)        let containerVIEw = TransitionContext.containerVIEw        containerVIEw.insertSubvIEw((toVC?.vIEw)!,belowSubvIEw: (fromVC?.vIEw)!)        // replace main vIEw with snapshot        let snapshot = fromVC?.vIEw.snapshotVIEw(afterScreenUpdates: false)        snapshot?.tag = MenuHelper.snapshotNumber        snapshot?.isUserInteractionEnabled = false        snapshot?.layer.shadowOpacity = 0.7        containerVIEw.insertSubvIEw(snapshot!,aboveSubvIEw: (toVC?.vIEw)!)        fromVC?.vIEw.isHIDden = true        UIVIEw.animate(            withDuration: TransitionDuration(using: TransitionContext),animations: {                snapshot!.center.x += UIScreen.main.bounds.wIDth * MenuHelper.menuWIDth            },completion: { _ in                fromVC?.vIEw.isHIDden = false                TransitionContext.completeTransition(!TransitionContext.TransitionWasCancelled)            }        )    }}

iPhone 6S Plus(物理设备)iOS 10

iPhone 7 Plus(模拟器)iOS 10

为什么模拟器上的快照是空白的？

GitHub test project

解决方法 添加此UIVIEw扩展,

public extension UIVIEw {    public func snapshotimage() -> UIImage? {        UIGraphicsBeginImageContextWithOptions(bounds.size,isOpaque,0)        drawHIErarchy(in: bounds,afterScreenUpdates: false)        let snapshotimage = UIGraphicsGetimageFromCurrentimageContext()        UIGraphicsEndImageContext()        return snapshotimage    }    public func snapshotVIEw() -> UIVIEw? {        if let snapshotimage = snapshotimage() {            return UIImageVIEw(image: snapshotimage)        } else {            return nil        }    }}

更新以下代码,

let snapshot = fromVC?.vIEw.snapshotVIEw(afterScreenUpdates: false)

用,

let snapshot = fromVC?.vIEw.snapshotVIEw()

Ref

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