[英]Swiftui Preview Crashing using Navigationstack (Problem Report included)
我不明白為什么每次按下“Hello World”文本時我的預覽都會崩潰。 我有一個以編程方式設置的導航堆棧，每次附加視圖時它都會在預覽中崩潰。 雖然我手機上的應用程序運行良好，但我認為如果預覽搞砸了，我一定是做錯了什么。 謝謝！
這是問題報告：
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Incident Identifier: 980494AC-44F1-43DF-B8BE-AB6FAA94E7A7
CrashReporter Key: 2F1EEC48-C1DA-2145-0171-733D5994FA2F
Hardware Model: MacBookAir9,1
Process: Previewtest [88699]
Path: /Users/USER/Library/Developer/Xcode/UserData/Previews/Simulator Devices/B5B42958-9616-46D6-A056-B44D3D125005/data/Containers/Bundle/Application/E4B38613-49C2-4582-9650-7295F743C525/Previewtest.app/Previewtest
Identifier: Partyhallen.Previewtest
Version: 1.0 (1)
Code Type: X86-64 (Native)
Role: Foreground
Parent Process: launchd_sim [87351]
Coalition: com.apple.CoreSimulator.SimDevice.B5B42958-9616-46D6-A056-B44D3D125005 [11821]
Responsible Process: SimulatorTrampoline [2117]
Date/Time: 2022-12-03 00:13:50.6532 +0100
Launch Time: 2022-12-03 00:13:49.4824 +0100
OS Version: macOS 12.6 (21G115)
Release Type: User
Report Version: 104
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: SIGNAL 4 Illegal instruction: 4
Terminating Process: exc handler [88699]
Triggered by Thread: 0
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libswiftCore.dylib 0x7ff80d700cc8 _assertionFailure(_:_:file:line:flags:) + 424
1 SwiftUI 0x10d6c9ed8 0x10c316000 + 20659928
2 SwiftUI 0x10d6c9de5 0x10c316000 + 20659685
3 Previewtest 0x1081105ab ContentView.router.getter + 139
4 ContentView.1.preview-thunk.dylib 0x10e4b761e closure #1 in closure #1 in ContentView.__preview__body.getter + 30 (ContentView.swift:13)
5 SwiftUI 0x10c7fc79d 0x10c316000 + 5138333
6 SwiftUI 0x10d08588a 0x10c316000 + 14088330
7 SwiftUI 0x10cded270 0x10c316000 + 11367024
8 SwiftUI 0x10cded284 0x10c316000 + 11367044
9 SwiftUI 0x10cded270 0x10c316000 + 11367024
10 SwiftUI 0x10cb03491 0x10c316000 + 8311953
11 SwiftUI 0x10cb02df2 0x10c316000 + 8310258
12 SwiftUI 0x10cc947a5 0x10c316000 + 9955237
13 SwiftUI 0x10d4437c8 0x10c316000 + 18012104
14 SwiftUI 0x10d441e5e 0x10c316000 + 18005598
15 SwiftUI 0x10d441f42 0x10c316000 + 18005826
16 SwiftUI 0x10d441720 0x10c316000 + 18003744
17 UIKitCore 0x1090274b9 -[UIGestureRecognizer _componentsEnded:withEvent:] + 153
18 UIKitCore 0x1096c6ebd -[UITouchesEvent _sendEventToGestureRecognizer:] + 662
19 UIKitCore 0x1090176f7 -[UIGestureEnvironment _updateForEvent:window:] + 469
20 UIKitCore 0x109669edb -[UIWindow sendEvent:] + 5282
21 UIKitCore 0x10963d7f2 -[UIApplication sendEvent:] + 898
22 UIKitCore 0x1096e4e61 __dispatchPreprocessedEventFromEventQueue + 9381
23 UIKitCore 0x1096e7569 __processEventQueue + 8334
24 UIKitCore 0x1096dd8a1 __eventFetcherSourceCallback + 272
25 CoreFoundation 0x7ff800387035 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
26 CoreFoundation 0x7ff800386f74 __CFRunLoopDoSource0 + 157
27 CoreFoundation 0x7ff800386771 __CFRunLoopDoSources0 + 212
28 CoreFoundation 0x7ff800380e73 __CFRunLoopRun + 927
29 CoreFoundation 0x7ff8003806f7 CFRunLoopRunSpecific + 560
30 GraphicsServices 0x7ff809c5c28a GSEventRunModal + 139
31 UIKitCore 0x10961c62b -[UIApplication _run] + 994
32 UIKitCore 0x109621547 UIApplicationMain + 123
33 SwiftUI 0x10d3fbcfb 0x10c316000 + 17718523
34 SwiftUI 0x10d3fbba8 0x10c316000 + 17718184
35 SwiftUI 0x10cab1b7d 0x10c316000 + 7977853
36 Previewtest 0x108112d4e static PreviewtestApp.$main() + 30 (PreviewtestApp.swift:4)
37 Previewtest 0x108112e09 main + 9
38 dyld_sim 0x1083662bf start_sim + 10
39 dyld 0x11476f52e start + 462
Thread 1:
0 libsystem_pthread.dylib 0x7ff834c38f48 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x7ff834c38f48 start_wqthread + 0
Thread 3:
0 libsystem_pthread.dylib 0x7ff834c38f48 start_wqthread + 0
Thread 4:
0 libsystem_pthread.dylib 0x7ff834c38f48 start_wqthread + 0
Thread 5:
0 libsystem_pthread.dylib 0x7ff834c38f48 start_wqthread + 0
Thread 6:: com.apple.uikit.eventfetch-thread
0 libsystem_kernel.dylib 0x7ff834bdf97a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x7ff834bdfce8 mach_msg + 56
2 CoreFoundation 0x7ff8003868de __CFRunLoopServiceMachPort + 145
3 CoreFoundation 0x7ff80038102f __CFRunLoopRun + 1371
4 CoreFoundation 0x7ff8003806f7 CFRunLoopRunSpecific + 560
5 Foundation 0x7ff800c5595c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 213
6 Foundation 0x7ff800c55bd5 -[NSRunLoop(NSRunLoop) runUntilDate:] + 72
7 UIKitCore 0x1096f0886 -[UIEventFetcher threadMain] + 535
8 Foundation 0x7ff800c7f1c3 __NSThread__start__ + 1009
9 libsystem_pthread.dylib 0x7ff834c3d4e1 _pthread_start + 125
10 libsystem_pthread.dylib 0x7ff834c38f6b thread_start + 15
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000200000003 rbx: 0x000000010d6ff670 rcx: 0xfffffffe00000000 rdx: 0x0000000000000003
rdi: 0x00007f7959c0f888 rsi: 0x000000000000001b rbp: 0x00007ff7b7def100 rsp: 0x00007ff7b7def0b0
r8: 0x0000000000000071 r9: 0x0000000000000070 r10: 0x0000000000000f30 r11: 0x0000600001a61aa8
r12: 0x0000000000000000 r13: 0x0000000000000046 r14: 0x00007f7959c0f880 r15: 0x000000000000000b
rip: 0x00007ff80d700cc8 rfl: 0x0000000000010246 cr2: 0x000000012793b000
Logical CPU: 1
Error Code: 0x00000000
Trap Number: 6
Binary Images:
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0x10c316000 - 0x10d9eefff com.apple.SwiftUI (4.1.17.100) <1622c162-0a3a-354c-94ea-62c5dd369612> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/SwiftUI.framework/SwiftUI
0x10810c000 - 0x108113fff Partyhallen.Previewtest (1.0) <a989b4b0-9e28-34db-865c-bbcabac9f176> /Users/USER/Library/Developer/Xcode/UserData/Previews/Simulator Devices/B5B42958-9616-46D6-A056-B44D3D125005/data/Containers/Bundle/Application/E4B38613-49C2-4582-9650-7295F743C525/Previewtest.app/Previewtest
0x10e4b5000 - 0x10e4b8fff ContentView.1.preview-thunk.dylib (*) <5d91714e-5553-3450-88be-8850c5896cb4> /Users/USER/Library/Developer/Xcode/DerivedData/Previewtest-haqnqqxsierjlvhdmnfotfqgnorc/Build/Intermediates.noindex/Previews/Previewtest/Intermediates.noindex/Previewtest.build/Debug-iphonesimulator/Previewtest.build/Objects-normal/x86_64/ContentView.1.preview-thunk.dylib
0x1087e1000 - 0x10a29dfff com.apple.UIKitCore (1.0) <c2258b63-cdcc-3504-a06e-8067adba9c34> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
0x7ff800302000 - 0x7ff80068affc com.apple.CoreFoundation (6.9) <55edff37-af14-3fed-b932-031049d0a665> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x7ff809c59000 - 0x7ff809c60ff2 com.apple.GraphicsServices (1.0) <5dad91c5-e70d-3f9a-88f2-2d1ed7c8dd24> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x108364000 - 0x1083c3fff dyld_sim (*) <638f8a1f-2a32-396d-8389-8d7a60b96b8d> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/dyld_sim
0x11476a000 - 0x1147d5fff dyld (*) <71febccd-d9dc-3599-9971-2b3407c588a8> /usr/lib/dyld
0x7ff834c37000 - 0x7ff834c42ff7 libsystem_pthread.dylib (*) <b5454e27-e8c7-3fdb-b77f-714f1e82e70b> /usr/lib/system/libsystem_pthread.dylib
0x7ff834bde000 - 0x7ff834c15fff libsystem_kernel.dylib (*) <8cc28466-fd2f-3c80-9834-9525b7beac19> /usr/lib/system/libsystem_kernel.dylib
0x7ff8006fd000 - 0x7ff80102dffc com.apple.Foundation (6.9) <353e6739-fc3a-3636-89f2-194adba7203b> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Foundation.framework/Foundation
EOF
-----------
Full Report
-----------
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{
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"path" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Library\/Developer\/CoreSimulator\/Profiles\/Runtimes\/iOS.simruntime\/Contents\/Resources\/RuntimeRoot\/System\/Library\/PrivateFrameworks\/GraphicsServices.framework\/GraphicsServices",
"name" : "GraphicsServices",
"CFBundleVersion" : "1.0"
},
{
"source" : "P",
"arch" : "x86_64",
"base" : 4432740352,
"size" : 393216,
"uuid" : "638f8a1f-2a32-396d-8389-8d7a60b96b8d",
"path" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Library\/Developer\/CoreSimulator\/Profiles\/Runtimes\/iOS.simruntime\/Contents\/Resources\/RuntimeRoot\/usr\/lib\/dyld_sim",
"name" : "dyld_sim"
},
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"source" : "P",
"arch" : "x86_64",
"base" : 4638285824,
"size" : 442368,
"uuid" : "71febccd-d9dc-3599-9971-2b3407c588a8",
"path" : "\/usr\/lib\/dyld",
"name" : "dyld"
},
{
"source" : "P",
"arch" : "x86_64",
"base" : 140704013840384,
"size" : 49144,
"uuid" : "b5454e27-e8c7-3fdb-b77f-714f1e82e70b",
"path" : "\/usr\/lib\/system\/libsystem_pthread.dylib",
"name" : "libsystem_pthread.dylib"
},
{
"source" : "P",
"arch" : "x86_64",
"base" : 140704013475840,
"size" : 229376,
"uuid" : "8cc28466-fd2f-3c80-9834-9525b7beac19",
"path" : "\/usr\/lib\/system\/libsystem_kernel.dylib",
"name" : "libsystem_kernel.dylib"
},
{
"source" : "P",
"arch" : "x86_64",
"base" : 140703135944704,
"CFBundleShortVersionString" : "6.9",
"CFBundleIdentifier" : "com.apple.Foundation",
"size" : 9637885,
"uuid" : "353e6739-fc3a-3636-89f2-194adba7203b",
"path" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Library\/Developer\/CoreSimulator\/Profiles\/Runtimes\/iOS.simruntime\/Contents\/Resources\/RuntimeRoot\/System\/Library\/Frameworks\/Foundation.framework\/Foundation",
"name" : "Foundation",
"CFBundleVersion" : "1953.1"
}
],
"sharedCache" : {
"base" : 140703128616960,
"size" : 2998861824,
"uuid" : "3140e7f6-3cc2-3fac-81dd-5fbfbbe796e1"
},
"vmSummary" : "ReadOnly portion of Libraries: Total=803.7M resident=0K(0%) swapped_out_or_unallocated=803.7M(100%)\nWritable regions: Total=575.2M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=575.2M(100%)\n\n VIRTUAL REGION \nREGION TYPE SIZE COUNT (non-coalesced) \n=========== ======= ======= \nActivity Tracing 256K 1 \nCG raster data 8K 1 \nColorSync 88K 5 \nCoreAnimation 20K 1 \nFoundation 16K 1 \nKernel Alloc Once 8K 1 \nMALLOC 177.5M 30 \nMALLOC guard page 32K 8 \nMALLOC_NANO (reserved) 384.0M 1 reserved VM address space (unallocated)\nSTACK GUARD 56.0M 7 \nStack 11.0M 7 \nVM_ALLOCATE 1052K 4 \n__DATA 11.3M 398 \n__DATA_CONST 36.7M 402 \n__DATA_DIRTY 26K 12 \n__FONT_DATA 2352 1 \n__LINKEDIT 358.0M 33 \n__OBJC_RO 28.3M 1 \n__OBJC_RW 880K 1 \n__TEXT 445.8M 410 \ndyld private memory 1280K 2 \nmapped file 206.8M 11 \nshared memory 16K 1 \n=========== ======= ======= \nTOTAL 1.7G 1339 \nTOTAL, minus reserved VM space 1.3G 1339 \n",
"legacyInfo" : {
"threadTriggered" : {
"queue" : "com.apple.main-thread"
}
},
"trialInfo" : {
"rollouts" : [
{
"rolloutId" : "63582c5f8a53461413999550",
"factorPackIds" : {
},
"deploymentId" : 240000002
},
{
"rolloutId" : "60f8ddccefea4203d95cbeef",
"factorPackIds" : {
},
"deploymentId" : 240000021
}
],
"experiments" : [
]
}
}
這是我的代碼：
import SwiftUI
import Foundation
@main
struct PreviewtestApp: App {
var body: some Scene {
WindowGroup {
AppContainerView()
}
}
}
import SwiftUI
import Foundation
struct AppContainerView: View {
@StateObject var router = Router()
var body: some View {
NavigationStack(path: $router.navigationPath) {
ContentView()
.navigationDestination(for: Route.self) { route in
switch route {
case .ContentView:
ContentView()
}
}
}.environmentObject(router)
}
}
import SwiftUI
import Foundation
struct ContentView: View {
@EnvironmentObject private var router: Router
var body: some View {
VStack {
Text("Hello, world!")
.onTapGesture {
router.pushView(route: .ContentView)
}
}
.padding()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
import Foundation
import SwiftUI
enum Route: Hashable {
case ContentView
}
final class Router: ObservableObject {
@Published var navigationPath = NavigationPath()
func pushView(route: Route) {
navigationPath.append(route)
}
func popToRootView() {
navigationPath = .init()
}
func popToSpecificView(k: Int) {
navigationPath.removeLast(k)
}
}
@StateObject在預覽期間未初始化，因此這可能導致崩潰。 您可以通過預覽AppContainerView而不是ContentView來解決它。
順便說一句，@StateObject @State @StateObject存儲引用類型但在此示例中不需要引用類型的情況。 此外， NavigationPath旨在保存數據值，而不是路線。 您可以為每種值使用多個navigationDestination ，而不是使用 switch 語句。
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