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

我的应用程序不断在后台崩溃，我不知道为什么。我正在使用 SwiftData 和 SwiftUI。我正在设置 

.backgroundTask
并启用 
Background fetch
功能。那是崩溃开始的时候。当我禁用该功能时，它们就消失了。

奇怪的是，即使我删除了

.backgroundTask
和
BGTaskScheduler.shared.submit
，崩溃仍然发生。我什至没有安排后台任务，即使安排了后台任务，我也没有做任何事情。为什么它仍然在后台崩溃？这是设置：

import SwiftUI
import SwiftData
import TipKit

@main
struct MyAppName: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    @State var navManager = NavigationManager.load()
    @State var alerter: Alerter = Alerter()

    var sharedModelContainer: ModelContainer = {
        var inMemory = false
        let enableIcloudSync = UserDefaults.standard.bool(forKey: Const.enableIcloudSync)

        #if DEBUG
        if CommandLine.arguments.contains("enable-testing") {
            inMemory = true
        }
        #endif

        let config = ModelConfiguration(
            schema: DataController.schema,
            isStoredInMemoryOnly: inMemory,
            cloudKitDatabase: enableIcloudSync ? .automatic : .none
        )

        do {
            return try ModelContainer(
                for: DataController.schema,
                configurations: [config]
            )
        } catch {
            fatalError("Could not create ModelContainer: \(error)")
        }
    }()

    var body: some Scene {
        WindowGroup {
            SetupView()
                .environment(alerter)
                .alert(isPresented: $alerter.isShowingAlert) {
                    alerter.alert ?? Alert(title: Text(verbatim: ""))
                }
                .task {
                    try? Tips.configure([
                        .displayFrequency(.immediate),
                        .datastoreLocation(.applicationDefault)
                    ])
                }
                .onAppear {
                    setUpAppDelegate()
                }
                .environment(navManager)
        }
        .modelContainer(sharedModelContainer)
    }

    func setUpAppDelegate() {
        appDelegate.navManager = navManager
    }
}

这是我收到的崩溃报告：

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001a1bb98c0
Termination Reason: SIGNAL 5 Trace/BPT trap: 5
Terminating Process: exc handler [809]

Triggered by Thread:  0


Thread 0 name:
Thread 0 Crashed:
0   libswiftCore.dylib              0x00000001a1bb98c0 _assertionFailure(_:_:file:line:flags:) + 264 (AssertCommon.swift:144)
1   libswiftCore.dylib              0x00000001a1c27d14 swift_unexpectedError + 664 (ErrorType.swift:188)
2   _SwiftData_SwiftUI              0x000000024310cd78 one-time initialization function for empty + 300 (ModelContainer+Extensions.swift:5)
3   libdispatch.dylib               0x00000001ab16add4 _dispatch_client_callout + 20 (object.m:576)
4   libdispatch.dylib               0x00000001ab16c654 _dispatch_once_callout + 32 (once.c:52)
5   _SwiftData_SwiftUI              0x000000024310cdf8 one-time initialization function for empty + 124 (ModelContainer+Extensions.swift:12)
6   libdispatch.dylib               0x00000001ab16add4 _dispatch_client_callout + 20 (object.m:576)
7   libdispatch.dylib               0x00000001ab16c654 _dispatch_once_callout + 32 (once.c:52)
8   _SwiftData_SwiftUI              0x0000000243122170 key path getter for EnvironmentValues.modelContext : EnvironmentValues + 140 (<compiler-generated>:0)
9   libswiftCore.dylib              0x00000001a1ce4628 RawKeyPathComponent._projectReadOnly<A, B, C>(_:to:endingWith:) + 1012 (KeyPath.swift:1701)
10  libswiftCore.dylib              0x00000001a1ce3ddc KeyPath._projectReadOnly(from:) + 1036 (KeyPath.swift:331)
11  libswiftCore.dylib              0x00000001a1ce8348 swift_getAtKeyPath + 24 (KeyPath.swift:2029)
12  SwiftUI                         0x00000001a7af4814 EnvironmentBox.update(property:phase:) + 872 (Environment.swift:273)
13  SwiftUI                         0x00000001a782a074 static BoxVTable.update(ptr:property:phase:) + 396 (DynamicPropertyBuffer.swift:294)
14  SwiftUI                         0x00000001a78297b0 _DynamicPropertyBuffer.update(container:phase:) + 104 (DynamicPropertyBuffer.swift:215)
15  SwiftUI                         0x00000001a887fb78 closure #1 in closure #1 in DynamicBody.updateValue() + 104 (DynamicProperty.swift:447)
16  SwiftUI                         0x00000001a887fbb8 partial apply for closure #1 in closure #1 in DynamicBody.updateValue() + 28 (<compiler-generated>:0)
17  libswiftCore.dylib              0x00000001a1bcc068 withUnsafeMutablePointer<A, B>(to:_:) + 28 (LifetimeManager.swift:82)
18  SwiftUI                         0x00000001a887f9dc closure #1 in DynamicBody.updateValue() + 408 (DynamicProperty.swift:446)
19  SwiftUI                         0x00000001a887f5c0 DynamicBody.updateValue() + 712 (DynamicProperty.swift:445)
20  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
21  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
22  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
23  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
25  SwiftUI                         0x00000001a887f548 DynamicBody.updateValue() + 592 (DynamicProperty.swift:444)
26  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
27  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
28  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
29  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
31  SwiftUI                         0x00000001a830f3ac Attribute.syncMainIfReferences<A>(do:) + 236 (AttributeGraphAdditions.swift:84)
32  SwiftUI                         0x00000001a81250f8 closure #1 in GeometryReader.Child.updateValue() + 108 (GeometryReader.swift:85)
33  SwiftUI                         0x00000001a81268ac partial apply for closure #1 in GeometryReader.Child.updateValue() + 24 (<compiler-generated>:0)
34  SwiftUI                         0x00000001a7a777d0 closure #1 in _withObservation<A>(do:) + 44 (ObservationUtils.swift:26)
35  SwiftUI                         0x00000001a81268cc partial apply for closure #1 in _withObservation<A>(do:) + 24 (<compiler-generated>:0)
36  libswiftCore.dylib              0x00000001a1bcc068 withUnsafeMutablePointer<A, B>(to:_:) + 28 (LifetimeManager.swift:82)
37  SwiftUI                         0x00000001a8124d88 GeometryReader.Child.updateValue() + 1108 (GeometryReader.swift:84)
38  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
39  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
40  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
41  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
43  SwiftUI                         0x00000001a819fc40 DynamicViewContainer.view.getter + 48
44  SwiftUI                         0x00000001a819fef0 DynamicViewList.updateValue() + 424 (DynamicView.swift:147)
45  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
46  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
47  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
48  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
50  SwiftUI                         0x00000001a8035204 specialized implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 168 (<compiler-generated>:0)
51  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
52  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
53  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
55  SwiftUI                         0x00000001a770a598 DynamicLayoutViewAdaptor.updatedItems() + 68 (DynamicLayoutView.swift:166)
56  SwiftUI                         0x00000001a7441efc specialized DynamicContainerInfo.updateItems(disableTransitions:) + 68 (DynamicContainer.swift:468)
57  SwiftUI                         0x00000001a7440e98 specialized DynamicContainerInfo.updateValue() + 376 (DynamicContainer.swift:326)
58  SwiftUI                         0x00000001a760b04c specialized implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 24 (<compiler-generated>:0)
59  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
60  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
61  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
63  SwiftUI                         0x00000001a7b14d34 DynamicPreferenceCombiner.info.getter + 96 (DynamicContainer.swift:0)
64  SwiftUI                         0x00000001a7b14f4c DynamicPreferenceCombiner.value.getter + 228 (DynamicContainer.swift:877)
65  SwiftUI                         0x00000001a72d30ac implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 324 (<compiler-generated>:0)
66  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
67  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
68  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
70  SwiftUI                         0x00000001a77b6d70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
71  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
72  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
73  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
74  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
76  SwiftUI                         0x00000001a77b6d70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
77  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
78  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
79  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
80  AttributeGraph                  0x00000001cbd42810 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                  0x00000001cbd423a4 AGGraphGetValue + 228 (AGGraph.mm:701)
82  SwiftUI                         0x00000001a77b6d70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
83  SwiftUI                         0x00000001a71e8bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
84  AttributeGraph                  0x00000001cbd4c240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
85  AttributeGraph                  0x00000001cbd42f38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
86  AttributeGraph                  0x00000001cbd4a538 AG::Graph::value_ref(AG::AttributeID, unsigned int, AGSwiftMetadata const*, unsigned char&) + 288 (ag-graph.cc:1201)
87  AttributeGraph                  0x00000001cbd4d470 AGGraphGetWeakValue + 388 (AGGraph.mm:735)
88  SwiftUI                         0x00000001a8708424 GraphHost.updatePreferences() + 48 (GraphHost.swift:773)
89  SwiftUI                         0x00000001a7d2a940 ViewGraph.updateOutputs() + 300 (ViewGraph.swift:614)
90  SwiftUI                         0x00000001a87db674 closure #2 in closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 1268 (ViewRendererHost.swift:243)
91  SwiftUI                         0x00000001a87db028 closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 660 (ViewRendererHost.swift:235)
92  SwiftUI                         0x00000001a87d9170 ViewRendererHost.render(interval:updateDisplayList:) + 408 (<compiler-generated>:0)
93  SwiftUI                         0x00000001a77712d4 closure #1 in _UIHostingView.requestImmediateUpdate() + 72 (_UIHostingView.swift:701)
94  SwiftUI                         0x00000001a8846690 thunk for @escaping @callee_guaranteed () -> () + 36
95  libdispatch.dylib               0x00000001ab16913c _dispatch_call_block_and_release + 32 (init.c:1530)
96  libdispatch.dylib               0x00000001ab16add4 _dispatch_client_callout + 20 (object.m:576)
97  libdispatch.dylib               0x00000001ab1795a4 _dispatch_main_queue_drain + 988 (queue.c:7898)
98  libdispatch.dylib               0x00000001ab1791b8 _dispatch_main_queue_callback_4CF + 44 (queue.c:8058)
99  CoreFoundation                  0x00000001a32a551c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 (CFRunLoop.c:1780)
100 CoreFoundation                  0x00000001a32a2218 __CFRunLoopRun + 1996 (CFRunLoop.c:3149)
101 CoreFoundation                  0x00000001a32a1968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
102 GraphicsServices                0x00000001e759f4e0 GSEventRunModal + 164 (GSEvent.c:2196)
103 UIKitCore                       0x00000001a5714edc -[UIApplication _run] + 888 (UIApplication.m:3692)
104 UIKitCore                       0x00000001a5714518 UIApplicationMain + 340 (UIApplication.m:5282)
105 SwiftUI                         0x00000001a80db860 closure #1 in KitRendererCommon(_:) + 168 (UIKitApp.swift:51)
106 SwiftUI                         0x00000001a80db6a8 runApp<A>(_:) + 152 (UIKitApp.swift:14)
107 SwiftUI                         0x00000001a7cf79fc static App.main() + 132 (App.swift:114)
108 MyAppName                       0x0000000100e6d120 static MyAppNameApp.$main() + 52 (MyAppNameApp.swift:0)
109 MyAppName                       0x0000000100e6d120 main + 64
110 dyld                            0x00000001c67c2d84 start + 2240 (dyldMain.cpp:1298)

报告还说

key path getter for EnvironmentValues.modelContext
，这看起来很奇怪。知道我可以从哪里开始寻找问题吗？

swift swiftui background swift-data
1个回答
0
投票

看起来您错过了 

static
上的 
var sharedModelContainer
。

通常我们会在 

extension ModelContainer
中使用单例，但也许你的方法更好。

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