问题描述
我和我的团队目前正在SwiftUI中开发Mastodon客户端，并且我有一个简单的StatusView，其中显示了所有帖子数据，当前看起来像这样：
此视图在我的项目中称为StatusView，它有两个NavigationLinks：主视图将用户重定向到帖子的主题，另一个视图将用户重定向到帖子作者的个人资料点击帖子的个人资料照片。
直到这里，一切正常。如果您在帖子中的任意位置而不是按钮（例如，增强和分享）或个人资料图片上轻按，则会打开主题。如果点击个人资料图片，则会打开作者的个人资料。
但是，如果您点击下方个人资料图片，则该应用会崩溃，只会出现以下错误：
2020-08-23 21:32:39.929392-0400 Hyperspace[830:147862] WF: _WebFilterIsActive returning: NO
2020-08-23 21:32:40.117865-0400 Hyperspace[830:147862] [assertion] Error acquiring assertion: <Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}>
2020-08-23 21:32:40.117994-0400 Hyperspace[830:147862] [ProcessSuspension] 0x11decfa80 - ProcessAssertion: Failed to acquire RBS Background assertion 'WebProcess Background Assertion' for process with PID 837,error: Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}
2020-08-23 21:32:40.119401-0400 Hyperspace[830:147862] [assertion] Error acquiring assertion: <Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}>
2020-08-23 21:32:40.119549-0400 Hyperspace[830:147862] [ProcessSuspension] 0x11decfac0 - ProcessAssertion: Failed to acquire RBS Suspended assertion 'WebProcess Suspended Assertion' for process with PID 837,error: Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}
Fatal error: UIKitNavigationBridge: multiple active destinations: file SwiftUI,line 0
2020-08-23 21:32:40.292135-0400 Hyperspace[830:147862] Fatal error: UIKitNavigationBridge: multiple active destinations: file SwiftUI,line 0
我猜这是因为，当您点击那里时，线程和配置文件的导航链接都被触发，导致应用程序崩溃，因为它有多个活动目标，因为它试图转到该线程和配置文件处同时。
TL; DR
我的应用程序崩溃是因为在不应该同时触发两个NavigationLink的情况下。我该如何解决？
预先感谢。
我的代码
/// The status is being displayed in a ``StatusList``,so we should make it smaller and more compact.
private struct CompactStatusView: View {
/// The ``Status`` data model from where we obtain all the data.
var status: Status
/// Used to trigger the navectigationLink to redirect the user to the thread.
@Binding var goToThread: Bool
/// Used to redirect the user to a specific profile.
@Binding var profileViewActive: Bool
var body: some View {
ZStack {
self.content
.padding(.vertical,5)
.contextMenu(
ContextMenu(menuItems: {
Button(action: {},label: {
Label("Report post",systemImage: "flag")
})
Button(action: {},label: {
Label("Report \(self.status.account.displayName)",label: {
Label("Share as Image",systemImage: "square.and.arrow.up")
})
})
)
}
.buttonStyle(PlainButtonStyle())
.navigationBarHidden(self.profileViewActive)
}
var content: some View {
HStack(alignment: .top,spacing: 12) {
URLImage(URL(string: self.status.account.avatarStatic)!,placeholder: { _ in
Image("amodrono")
.resizable()
.scaledToFit()
.clipShape(Circle())
.frame(width: 50,height: 50)
.redacted(reason: .placeholder)
},content: {
$0.image
.resizable()
.scaledToFit()
.clipShape(Circle())
.frame(width: 50,height: 50)
}
)
.onTapGesture {
self.profileViewActive.toggle()
}
.background(
NavigationLink(
destination: ProfileView(
accountInfo: Profileviewmodel(
accountID: self.status.account.id
),isParent: false
),isActive: self.$profileViewActive
) {
Text("")
}
.frame(width: 0,height: 0)
)
vstack(alignment: .leading,spacing: 2) {
HStack(alignment: .firstTextBaseline) {
if !self.status.account.displayName.isEmpty {
Text("\(self.status.account.displayName)")
.font(.headline)
.lineLimit(1)
}
Text("@\(self.status.account.acct)")
.foregroundColor(.secondary)
.lineLimit(1)
Text("· \(self.status.createdAt.getDate()!.getInterval())")
.foregroundColor(.secondary)
.lineLimit(1)
}
StatusViewContent(
isMain: false,content: self.status.content,card: self.status.card,attachments: self.status.mediaAttachments,goToProfile: self.$profileViewActive
)
StatusActionButtons(
isMain: false,repliesCount: self.status.repliesCount,reblogsCount: self.status.reblogsCount,favouritesCount: self.status.favouritesCount,statusUrl: self.status.uri
)
}
.onTapGesture {
self.goToThread.toggle()
}
.background(
NavigationLink(
destination: ThreadView(
mainStatus: self.status
),isActive: self.$goToThread
) {
EmptyView()
}
)
Spacer()
}
}
}
我想这里的重要部分是：
个人资料图片：
URLImage(URL(string: self.status.account.avatarStatic)!,height: 0)
)
最后两个修饰符
.onTapGesture {
self.goToThread.toggle()
}
.background(
NavigationLink(
destination: ThreadView(
mainStatus: self.status
),isActive: self.$goToThread
) {
EmptyView()
}
)
解决方法
这里是在某些复制方案中的可能解决方案的演示（因为提供的代码不能按原样进行测试）。这个想法是重用一个NavigationLink，但根据激活位置的不同，目的地也不同。
通过Xcode 12 / iOS 14测试
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