我有一个基本的Mac应用程序,通过自动布局完成视图动画:
→动画将使其看起来好像视图从右侧滑入。
为自动布局更改设置动画的推荐方法是:
NSAnimationContext.runAnimationGroup()
allowsImplicitAnimation
至true
view.layoutSubtreeIfNeeded()
我遵循了这个建议,在macOS Sierra上一切正常,但在macOS High Sierra上,动画不再发生了。相反,视图显示在没有动画的最终位置。
我找到了一种解决方法:我使用DispatchQueue.main.async
在下一个runloop循环中安排动画。然而,这似乎是一个黑客,我想知道在这里是否还有其他东西。
这是我的实际代码:
private func appendSlideViewControllerAnimated(_ viewController:NSViewController, to viewToTheLeft:NSView)
{
// Insert the new view on the very right, just outside the parent:
viewController.view.frame = self.view.bounds
viewController.view.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(viewController.view)
viewController.view.topAnchor.constraint( equalTo: view.topAnchor ).isActive = true
viewController.view.bottomAnchor.constraint( equalTo: view.bottomAnchor ).isActive = true
viewController.view.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
viewController.view.leadingAnchor.constraint(equalTo: viewToTheLeft.trailingAnchor).isActive = true
// Update the layout after we just added the view on the right:
view.layoutSubtreeIfNeeded()
// Starting with macOS High Sierra, animating constraint changes for the newly inserted view
// only works if scheduled on the next runloop:
//DispatchQueue.main.async {
// Update the constraints to pin the view to the left:
self.view.removeConstraint(self.activeSlideLeadingConstraint!)
self.activeSlideLeadingConstraint = viewController.view.leadingAnchor.constraint(equalTo: self.view.leadingAnchor)
self.activeSlideLeadingConstraint?.constant = 0
self.activeSlideLeadingConstraint?.isActive = true
NSAnimationContext.runAnimationGroup( { context in
self.isAnimating = true
context.duration = self.slidingAnimationDuration
context.allowsImplicitAnimation = true
self.view.layoutSubtreeIfNeeded()
}, completionHandler: {
viewToTheLeft.removeFromSuperview()
self.clearUndoHistory()
self.updateFirstResponder()
self.isAnimating = false
})
//}
}
答案 0 :(得分:0)
为您尝试设置动画的根视图启用核心动画支持。它可以在Interface Builder中完成,也可以通过编程方式完成:
override func viewDidLoad()
{
super.viewDidLoad()
view.wantsLayer = true
}