我有一个NSPageController包含8个左右的NSViewControllers。当鼠标位于窗口内部时，我希望有一个半透明的底部栏，而无论鼠标在哪里，我都希望有一个半透明的顶部栏。
我将顶部栏和底部栏以及NSPageControllers viewDidLoad（）方法中的约束添加到视图中。
它们在第一页上显示很好，但是当我开始从一页过渡到另一页时，新的NSViewController在覆盖的视图上重新绘制，它们消失了。我可以验证它们是否在NSViewControllers下，因为然后我将其一直拖动到特定的一侧，可以在下面看到它们。
有什么想法为什么会发生/如何避免呢？
码：
class MyPageController: NSPageController {
// MARK: - Properties
fileprivate var mouseIsInside = false
fileprivate var tabBar: TabBar!
// MARK: - NSViewController
override func viewDidLoad() {
super.viewDidLoad()
// add tab bar, then hide it (mouse in or outside of window will restore current state)
tabBar = TabBar(frame: NSRect(x: 0, y:0, width: view.frame.size.width, height: 40))
addTabBar(withAnimation: false)
removeTabBar(withAnimation: false)
NSLayoutConstraint.activate([
tabBar.heightAnchor.constraint(equalToConstant: 40),
tabBar.bottomAnchor.constraint(equalTo: view.bottomAnchor),
tabBar.centerXAnchor.constraint(equalTo: view.centerXAnchor),
tabBar.widthAnchor.constraint(equalTo: view.widthAnchor)
])
delegate = self
transitionStyle = .horizontalStrip
arrangedObjects = ["0","1","2","3","4","5","6","7"]
selectedIndex = 0
view.wantsLayer = true
// register for mouse events
let trackingArea = NSTrackingArea(rect: view.bounds, options: [.mouseEnteredAndExited, .mouseMoved, .activeAlways, .inVisibleRect], owner: self, userInfo: nil)
view.addTrackingArea(trackingArea)
}
}
// NSPageController Delegate
extension PageController: NSPageControllerDelegate {
func pageController(_ pageController: NSPageController, frameFor object: Any?) -> NSRect {
return NSInsetRect(view.frame, -1, 0)
}
func pageController(_ pageController: NSPageController, identifierFor object: Any) -> String {
return (object as? String)!
}
func pageController(_ pageController: NSPageController, viewControllerForIdentifier identifier: String) -> NSViewController {
return ViewController(id: identifier)
}
func pageControllerWillStartLiveTransition(_ pageController: NSPageController) {
Swift.print("pageControllerWillStartLiveTransition")
addTabBar(withAnimation: false)
}
func pageControllerDidEndLiveTransition(_ pageController: NSPageController) {
pageController.completeTransition()
addTabBar(withAnimation: false)
Swift.print("pageControllerWillEndLiveTransition")
}
}
// tabBar functions
extension PageController {
func addTabBar(withAnimation shouldAnimate: Bool) {
view.addSubview(tabBar)
tabBar.frame.size.width = view.frame.size.width
if mouseIsInside {
tabBar.showWithAnimation(shouldAnimate)
}
}
func removeTabBar(withAnimation shouldAnimate: Bool) {
tabBar.hideWithAnimation(shouldAnimate)
}
}
// Mouse Movements
extension PageController {
override func mouseEntered(with event: NSEvent) {
mouseIsInside = true
addTabBar(withAnimation: true)
}
override func mouseExited(with event: NSEvent) {
mouseIsInside = false
removeTabBar(withAnimation: true)
}
}
提前致谢！
最佳答案
这似乎是一个未解决的错误。这为我解决了：
如果pageController充满了窗口的视图，请设置为contentView的背景为零。这样，我们将看到的背景始终是pageController的背景。
使用这种方法对视图进行排序：
func pageControllerDidEndLiveTransition(_ pageController: NSPageController) {
let controller = selectedViewController as! (YOUR_NSVIEWCONTROLLER_CLASS)
controller.view.superview?.addSubview(controller.view, positioned: .below, relativeTo: TOOLBAR)
}
将
YOUR_NSVIEWCONTROLLER_CLASS替换为您的ViewController类名，然后将TOOLBAR替换为您想在顶部看到的视图。关于cocoa - NSView覆盖NSPageController在过渡时消失，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40747362/