blocks|key|1758282|text|我认为这是当前PresentationLink测试版中的SwiftUI错误。当我试图重新打开模式时，我也会遇到同样的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1758283|EDIT1:+NavigationLink需要嵌入到NavigationView中，如果没有，将显示消息[WindowServer]+display_timer_callback:+unexpected+state+(now:1abc3d3ccc7+<+expected:1abc3d91a0f)|offset|length|style|CODE|1758284|EDIT2:+PresentationLink只在嵌入NavigationBarItems或List之类的东西时才会出现问题。|1758285|entityMap^0|0|1G|2O|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I believe this is bug in PresentationLink in current SwiftUI beta. I get the same error while trying to reopen modal after dismissing it.

EDIT1:
NavigationLink requires to be embedded in NavigationView and if there is none will present message <code>[WindowServer] display_timer_callback: unexpected state (now:1abc3d3ccc7 &lt; expected:1abc3d91a0f)</code>

EDIT2: PresentationLink only appears to be buggy while embedded in things like NavigationBarItems or Lists etc.

blocks|key|4034012|text|好像是个虫子。我设法想出了一个(肮脏的)解决办法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4034013|private+enum+SetPresentedViewKey:+EnvironmentKey+{
++++static+var+defaultValue:+(AnyView?)+->+()+{
++++++++fatalError()
++++}
}

private+extension+EnvironmentValues+{
++++var+setPresentedView:+(AnyView?)+->+()+{
++++++++get+{
++++++++++++self[SetPresentedViewKey.self]
++++++++}+set+{
++++++++++++self[SetPresentedViewKey.self]+=+newValue
++++++++}
++++}
}

///+A+replacement+for+the+buggy+(as+of+Xcode+11+b3)+`PresentationLink`.
public+struct+PresentationLink2<Destination:+View,+Label:+View>:+View+{
++++public+let+destination:+Destination
++++public+let+label:+Label

++++@Environment(\.setPresentedView)+private+var+setPresentedView
++++@State+private+var+presentedView:+AnyView?+=+nil

++++public+init(destination:+Destination,+@ViewBuilder+_+label:+()+->+Label)+{
++++++++self.destination+=+destination
++++++++self.label+=+label()
++++}

++++private+struct+_Body<Destination:+View,+Label:+View>:+View+{
++++++++@Environment(\.setPresentedView)+private+var+setPresentedView

++++++++let+destination:+Destination
++++++++let+label:+Label

++++++++init(destination:+Destination,+label:+Label)+{
++++++++++++self.destination+=+destination
++++++++++++self.label+=+label
++++++++}

++++++++var+body:+some+View+{
++++++++++++Button(action:+present,+label:+{+label+})
++++++++}

++++++++func+present()+{
++++++++++++setPresentedView(AnyView(destination))
++++++++}
++++}

++++public+var+body:+some+View+{
++++++++_Body(destination:+destination,+label:+label)
++++++++++++.environment(\.setPresentedView,+{+self.presentedView+=+$0+})
++++++++++++.presentation(presentedView.map+{
++++++++++++++++Modal($0,+onDismiss:+{+self.presentedView+=+nil+})
++++++++++++})
++++}
}|code-block|syntax|javascript|4034014|只需将上面的代码复制到您的代码库中，使用PresentationLink2而不是PresentationLink。|offset|length|style|CODE|4034015|正如@kozlowsqi所指出的，当嵌入到一个PresentationLink中时，NavigationView似乎被破坏了。令人震惊的是，它在Xcode+beta+3中仍然是坏的。|4034016|编辑:我已经通过一个新的反馈助理应用程序，FB6525020雷达。请提出你自己和参考我的，并希望这将解决贝塔4。|4034017|entityMap^0|0|0|K|H|14|G|0|N|G|16|E|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@$I|10|J|11|K|L]|$I|12|J|13|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|R|$]]

It seems to be a bug. I've managed to whip up a (dirty) workaround:

<pre><code>private enum SetPresentedViewKey: EnvironmentKey {
 static var defaultValue: (AnyView?) -&gt; () {
 fatalError()
 }
}

private extension EnvironmentValues {
 var setPresentedView: (AnyView?) -&gt; () {
 get {
 self[SetPresentedViewKey.self]
 } set {
 self[SetPresentedViewKey.self] = newValue
 }
 }
}

/// A replacement for the buggy (as of Xcode 11 b3) `PresentationLink`.
public struct PresentationLink2&lt;Destination: View, Label: View&gt;: View {
 public let destination: Destination
 public let label: Label

 @Environment(\.setPresentedView) private var setPresentedView
 @State private var presentedView: AnyView? = nil

 public init(destination: Destination, @ViewBuilder _ label: () -&gt; Label) {
 self.destination = destination
 self.label = label()
 }

 private struct _Body&lt;Destination: View, Label: View&gt;: View {
 @Environment(\.setPresentedView) private var setPresentedView

 let destination: Destination
 let label: Label

 init(destination: Destination, label: Label) {
 self.destination = destination
 self.label = label
 }

 var body: some View {
 Button(action: present, label: { label })
 }

 func present() {
 setPresentedView(AnyView(destination))
 }
 }

 public var body: some View {
 _Body(destination: destination, label: label)
 .environment(\.setPresentedView, { self.presentedView = $0 })
 .presentation(presentedView.map {
 Modal($0, onDismiss: { self.presentedView = nil })
 })
 }
}
</code></pre>

Just copy the code above into your codebase and use <code>PresentationLink2</code> instead of <code>PresentationLink</code>.

<hr>

As noted by @kozlowsqi, <code>PresentationLink</code> seems to be broken when embedded in a <code>NavigationView</code>. What's alarming is that it's still broken as of Xcode beta 3.

Edit: I've filed a radar through the new Feedback Assistant app, FB6525020. Please raise your own and reference mine, and hopefully this will be resolved by beta 4.

blocks|key|4034067|text|我已经创建了一个更可靠的PresentationLink替代品。希望一旦beta+4发布，它就不再需要了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4034068|你可以在这里找到一个要点：https://gist.github.com/petercv/3fba967a69b262901053fc8638b7851b|offset|length|4034069|我还添加了对.isModalInPresentation(_+value:+Bool)修饰符的支持，以设置UIViewController的isModalInPresentation属性。希望苹果会很快加入这一行列。|4034070|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/petercv/3fba967a69b262901053fc8638b7851b^0|0|D|1S|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

I've created a PresentationLink replacement that works far more reliable. Hopefully it won't be needed anymore as soon as beta 4 is released.

You can find a gist here:
<a href="https://gist.github.com/petercv/3fba967a69b262901053fc8638b7851b" rel="nofollow noreferrer">https://gist.github.com/petercv/3fba967a69b262901053fc8638b7851b</a>

I've also added support for a .isModalInPresentation(_ value: Bool) modifier to set the isModalInPresentation property of UIViewController. Hopefully Apple will add this too soon.

When using NavigationLink or presentation link in swiftUI, the navigation controller doesn't push or present a new View, getting error

<blockquote>
 "[WindowServer] display_timer_callback: unexpected state"
</blockquote>

<pre><code>ForEach(self.items.identified(by: \.name)) { item in


 NavigationLink(destination: Text("DT In the House")) {
 CategoryItem(item: item)


 }
}
</code></pre>

<blockquote>
 [] nw_connection_receive_internal_block_invoke [C4] Receive reply
 failed with error "Operation canceled"
</blockquote>

SwiftUI Navigationlink or Presentation Link not working

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在使用NavigationLink或swiftUI中的表示链接时，导航控制器不会推送或显示新视图，从而导致错误"WindowServer display_timer_callback:意外状态“ForEach(self.items.identified(by: \.name)) {  item in    Naviga...

问SwiftUI导航链接或表示链接不工作
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