CATransition 在过渡期间变黑
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【中文标题】CATransition 在过渡期间变黑【英文标题】:CATransition fading black during the transition 【发布时间】:2017-04-07 07:06:08 【问题描述】:我正在两个视图控制器上执行一个简单的从右到左的转换。动画效果完美,正是我想要的结果。但是,由于呈现/呈现的视图控制器淡入/淡出,我在背景中看到黑色闪光。
我的过渡:
let transition = CATransition()
transition.duration = 2.25 // Slow duration to see the black.
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromRight
view.window!.layer.add(transition, forKey: kCATransition)
present(vc, animated: false, completion: nil)
我读到在 AppDelegate didFinishLaunchingWithOptions 中设置窗口颜色可以解决这个问题,但是,这似乎没有做任何事情。 (过渡期间黑色仍然可见。)
self.window!.backgroundColor = UIColor.white
有什么建议可以让两个 VC 在此期间过渡而不会出现黑色闪烁吗?谢谢。
【问题讨论】:
【参考方案1】:我曾经在prepare(for:sender:)
中进行自定义转换时遇到完全相同的问题。我在阅读A Beginner’s Guide to Animated Custom Segues in ios 8后设法解决了它。
在 Storyboard 中选择您的 segue,选择 custom 类型并应用自定义 SegueFromBottom
类:
这是 Swift 3 的更新代码。
import UIKit
class SegueFromBottom: UIStoryboardSegue
override func perform()
// Assign the source and destination views to local variables.
let firstVCView = self.source.view as UIView!
let secondVCView = self.destination.view as UIView!
// Get the screen width and height.
let screenWidth = UIScreen.main.bounds.size.width
let screenHeight = UIScreen.main.bounds.size.height
// Specify the initial position of the destination view.
secondVCView?.frame = CGRect(x: 0.0, y: screenHeight, width: screenWidth, height: screenHeight)
// Access the app's key window and insert the destination view above the current (source) one.
let window = UIApplication.shared.keyWindow
window?.insertSubview(secondVCView!, aboveSubview: firstVCView!)
// Animate the transition.
UIView.animate(withDuration: 0.4, animations: () -> Void in
firstVCView?.frame = (firstVCView?.frame.offsetBy(dx: 0.0, dy: -screenHeight))!
secondVCView?.frame = (secondVCView?.frame.offsetBy(dx: 0.0, dy: -screenHeight))!
, completion: (Finished) -> Void in
self.source.present(self.destination as UIViewController, animated: false, completion: nil)
)
【讨论】:
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