后台崩溃：_SwiftData_SwiftUI：空的一次性初始化函数

问题描述 投票：0回答：1

我正在使用 SwiftData 和 SwiftUI，但我的应用程序不断在后台崩溃。遗憾的是我无法重现它。

这些是我迄今为止的观察：

  • 打开 
    Background fetch
    和/或 
    Remote Notifications
    （对于 CloudKit）会导致问题；只有当我关闭两者时，问题才会消失
  • 如果我打开
    Background fetch
    ，即使我没有添加任何在后台运行的代码（所以没有
    .backgroundTask
    ，没有通过
    BGAppRefreshTaskRequest
    进行任务调度）应用程序仍然崩溃，所以看起来并不无论我自己在后台做什么或是否做任何事情
  • 我对此不确定，但从报告来看，该问题似乎可能与使用安装了该应用程序的两个设备有关，有人报告该应用程序在 iPad 上运行，然后在 iPhone 上崩溃，尽管该应用程序没有运行在那里运行，iPad 版本没有问题
  • 它似乎只是在一段时间后崩溃，从来没有在应用程序打开时崩溃，据我所知，关闭应用程序后不会立即崩溃

这是 Xcode 崩溃报告：

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x000000019dd618c0
Termination Reason: SIGNAL 5 Trace/BPT trap: 5
Terminating Process: exc handler [622]

Triggered by Thread:  0


Thread 0 name:
Thread 0 Crashed:
0   libswiftCore.dylib              0x000000019dd618c0 _assertionFailure(_:_:file:line:flags:) + 264 (AssertCommon.swift:144)
1   libswiftCore.dylib              0x000000019ddcfd14 swift_unexpectedError + 664 (ErrorType.swift:188)
2   _SwiftData_SwiftUI              0x000000023fd20d78 one-time initialization function for empty + 300 (ModelContainer+Extensions.swift:5)
3   libdispatch.dylib               0x00000001a7312dd4 _dispatch_client_callout + 20 (object.m:576)
4   libdispatch.dylib               0x00000001a7314654 _dispatch_once_callout + 32 (once.c:52)
5   _SwiftData_SwiftUI              0x000000023fd20df8 one-time initialization function for empty + 124 (ModelContainer+Extensions.swift:12)
6   libdispatch.dylib               0x00000001a7312dd4 _dispatch_client_callout + 20 (object.m:576)
7   libdispatch.dylib               0x00000001a7314654 _dispatch_once_callout + 32 (once.c:52)
8   _SwiftData_SwiftUI              0x000000023fd36170 key path getter for EnvironmentValues.modelContext : EnvironmentValues + 140 (<compiler-generated>:0)
9   libswiftCore.dylib              0x000000019de8c628 RawKeyPathComponent._projectReadOnly<A, B, C>(_:to:endingWith:) + 1012 (KeyPath.swift:1701)
10  libswiftCore.dylib              0x000000019de8bddc KeyPath._projectReadOnly(from:) + 1036 (KeyPath.swift:331)
11  libswiftCore.dylib              0x000000019de90348 swift_getAtKeyPath + 24 (KeyPath.swift:2029)
12  SwiftUI                         0x00000001a3c9c814 EnvironmentBox.update(property:phase:) + 872 (Environment.swift:273)
13  SwiftUI                         0x00000001a39d2074 static BoxVTable.update(ptr:property:phase:) + 396 (DynamicPropertyBuffer.swift:294)
14  SwiftUI                         0x00000001a39d17b0 _DynamicPropertyBuffer.update(container:phase:) + 104 (DynamicPropertyBuffer.swift:215)
15  SwiftUI                         0x00000001a4a27b78 closure #1 in closure #1 in DynamicBody.updateValue() + 104 (DynamicProperty.swift:447)
16  SwiftUI                         0x00000001a4a27bb8 partial apply for closure #1 in closure #1 in DynamicBody.updateValue() + 28 (<compiler-generated>:0)
17  libswiftCore.dylib              0x000000019dd74068 withUnsafeMutablePointer<A, B>(to:_:) + 28 (LifetimeManager.swift:82)
18  SwiftUI                         0x00000001a4a279dc closure #1 in DynamicBody.updateValue() + 408 (DynamicProperty.swift:446)
19  SwiftUI                         0x00000001a4a275c0 DynamicBody.updateValue() + 712 (DynamicProperty.swift:445)
20  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
21  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
22  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
23  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
24  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
25  SwiftUI                         0x00000001a4a27548 DynamicBody.updateValue() + 592 (DynamicProperty.swift:444)
26  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
27  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
28  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
29  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
30  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
31  SwiftUI                         0x00000001a44b73ac Attribute.syncMainIfReferences<A>(do:) + 236 (AttributeGraphAdditions.swift:84)
32  SwiftUI                         0x00000001a42cd0f8 closure #1 in GeometryReader.Child.updateValue() + 108 (GeometryReader.swift:85)
33  SwiftUI                         0x00000001a42ce8ac partial apply for closure #1 in GeometryReader.Child.updateValue() + 24 (<compiler-generated>:0)
34  SwiftUI                         0x00000001a3c1f7d0 closure #1 in _withObservation<A>(do:) + 44 (ObservationUtils.swift:26)
35  SwiftUI                         0x00000001a42ce8cc partial apply for closure #1 in _withObservation<A>(do:) + 24 (<compiler-generated>:0)
36  libswiftCore.dylib              0x000000019dd74068 withUnsafeMutablePointer<A, B>(to:_:) + 28 (LifetimeManager.swift:82)
37  SwiftUI                         0x00000001a42ccd88 GeometryReader.Child.updateValue() + 1108 (GeometryReader.swift:84)
38  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
39  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
40  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
41  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
42  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
43  SwiftUI                         0x00000001a4347c40 DynamicViewContainer.view.getter + 48
44  SwiftUI                         0x00000001a4347ef0 DynamicViewList.updateValue() + 424 (DynamicView.swift:147)
45  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
46  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
47  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
48  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
49  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
50  SwiftUI                         0x00000001a41dd204 specialized implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 168 (<compiler-generated>:0)
51  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
52  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
53  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
54  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
55  SwiftUI                         0x00000001a38b2598 DynamicLayoutViewAdaptor.updatedItems() + 68 (DynamicLayoutView.swift:166)
56  SwiftUI                         0x00000001a35e9efc specialized DynamicContainerInfo.updateItems(disableTransitions:) + 68 (DynamicContainer.swift:468)
57  SwiftUI                         0x00000001a35e8e98 specialized DynamicContainerInfo.updateValue() + 376 (DynamicContainer.swift:326)
58  SwiftUI                         0x00000001a37b304c specialized implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 24 (<compiler-generated>:0)
59  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
60  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
61  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
62  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
63  SwiftUI                         0x00000001a3cbcd34 DynamicPreferenceCombiner.info.getter + 96 (DynamicContainer.swift:0)
64  SwiftUI                         0x00000001a3cbcf4c DynamicPreferenceCombiner.value.getter + 228 (DynamicContainer.swift:877)
65  SwiftUI                         0x00000001a347b0ac implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 324 (<compiler-generated>:0)
66  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
67  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
68  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
69  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
70  SwiftUI                         0x00000001a395ed70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
71  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
72  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
73  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
74  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
75  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
76  SwiftUI                         0x00000001a395ed70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
77  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
78  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
79  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
80  AttributeGraph                  0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
81  AttributeGraph                  0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
82  SwiftUI                         0x00000001a395ed70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
83  SwiftUI                         0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
84  AttributeGraph                  0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
85  AttributeGraph                  0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
86  AttributeGraph                  0x00000001c7ef2538 AG::Graph::value_ref(AG::AttributeID, unsigned int, AGSwiftMetadata const*, unsigned char&) + 288 (ag-graph.cc:1201)
87  AttributeGraph                  0x00000001c7ef5470 AGGraphGetWeakValue + 388 (AGGraph.mm:735)
88  SwiftUI                         0x00000001a48b0424 GraphHost.updatePreferences() + 48 (GraphHost.swift:773)
89  SwiftUI                         0x00000001a3ed2940 ViewGraph.updateOutputs() + 300 (ViewGraph.swift:614)
90  SwiftUI                         0x00000001a4983674 closure #2 in closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 1268 (ViewRendererHost.swift:243)
91  SwiftUI                         0x00000001a4983028 closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 660 (ViewRendererHost.swift:235)
92  SwiftUI                         0x00000001a4981170 ViewRendererHost.render(interval:updateDisplayList:) + 408 (<compiler-generated>:0)
93  SwiftUI                         0x00000001a39192d4 closure #1 in _UIHostingView.requestImmediateUpdate() + 72 (_UIHostingView.swift:701)
94  SwiftUI                         0x00000001a49ee690 thunk for @escaping @callee_guaranteed () -> () + 36
95  libdispatch.dylib               0x00000001a731113c _dispatch_call_block_and_release + 32 (init.c:1530)
96  libdispatch.dylib               0x00000001a7312dd4 _dispatch_client_callout + 20 (object.m:576)
97  libdispatch.dylib               0x00000001a73215a4 _dispatch_main_queue_drain + 988 (queue.c:7898)
98  libdispatch.dylib               0x00000001a73211b8 _dispatch_main_queue_callback_4CF + 44 (queue.c:8058)
99  CoreFoundation                  0x000000019f44d51c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 (CFRunLoop.c:1780)
100 CoreFoundation                  0x000000019f44a218 __CFRunLoopRun + 1996 (CFRunLoop.c:3149)
101 CoreFoundation                  0x000000019f449968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
102 GraphicsServices                0x00000001e37474e0 GSEventRunModal + 164 (GSEvent.c:2196)
103 UIKitCore                       0x00000001a18bcedc -[UIApplication _run] + 888 (UIApplication.m:3692)
104 UIKitCore                       0x00000001a18bc518 UIApplicationMain + 340 (UIApplication.m:5282)
105 SwiftUI                         0x00000001a4283860 closure #1 in KitRendererCommon(_:) + 168 (UIKitApp.swift:51)
106 SwiftUI                         0x00000001a42836a8 runApp<A>(_:) + 152 (UIKitApp.swift:14)
107 SwiftUI                         0x00000001a3e9f9fc static App.main() + 132 (App.swift:114)
108 Unwatched                       0x000000010285aa64 static UnwatchedApp.$main() + 52 (UnwatchedApp.swift:0)
109 Unwatched                       0x000000010285aa64 main + 64
110 dyld                            0x00000001c296ad84 start + 2240 (dyldMain.cpp:1298)

这是 Sentry 崩溃报告：

我已将 Sentry 添加到项目中，希望它能为我提供有关崩溃的更多详细信息。这似乎是同一次崩溃，这是完整的崩溃日志。

EXC_BREAKPOINT
_SwiftData_SwiftUI/ModelContainer+Extensions.swift > 'try!' expression unexpectedly raised an error:  > 'try!' expression unexpectedly raised an error: SwiftData.SwiftDataError(_error: SwiftData.SwiftDataError._Error.loadIssueModelContainer) > Fatal error >
Stack overflow in (null)

有人见过类似的崩溃吗？这可能是 SwiftData/SwiftUI Bug 吗？

我很感激您对我可以尝试什么或问题可能来自何处的任何想法。

swiftui background crash swift-data
1个回答
0
投票

感谢布莱恩，我想我终于弄清楚了！

这个Apple Developer Thread也有类似的问题，它似乎是一个SwiftUI错误。当应用程序从非活动状态在后台启动时，当在根

@Environment
中使用
ContentView
变量时，它会崩溃（对我来说似乎只发生在
.modelContext
）。

我能够通过直接在后台启动应用程序来可靠地重现它。

这就是我正在做的：

@main struct MyApp: App { var sharedModelContainer: ModelContainer = { // ... }() var body: some Scene { WindowGroup { ContentView() } .modelContainer(sharedModelContainer) } } struct ContentView: View { @Environment(\.modelContext) var modelContext var body: some View { MyView() } func someFunc() { modelContext.insert(...) } } 
我现在将 
container
 作为参数传递给根视图，并通过 
.modelContainer(...)
 将其添加到那里。这似乎已经解决了问题：


@main
struct MyApp: App {
    var sharedModelContainer: ModelContainer = {
        // ...
    }()
    
    var body: some Scene {
        WindowGroup {
            ContentView(container: sharedModelContainer)
        }
    }
}

struct ContentView: View {
    let container: ModelContainer
    
    var body: some View {
        MyView()
            .modelContainer(container)
    }
    
    func someFunc() {
        let modelContext = ModelContext(container)
        modelContext.insert(...)
    }
}

    



    

    


  

  

    
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