I can't figure out why my preview is crashing each time I press the "Hello World" text. I have a programatically navigationstack setup, and each time a view is appended it crashes in the preview. The app on my phone works great though, but I thought I must be doing something wrong if the preview is messing up. Thanks!
Here is the problem report:
-------------------------------------
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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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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"name" : "dyld_sim"
},
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"uuid" : "71febccd-d9dc-3599-9971-2b3407c588a8",
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"uuid" : "b5454e27-e8c7-3fdb-b77f-714f1e82e70b",
"path" : "\/usr\/lib\/system\/libsystem_pthread.dylib",
"name" : "libsystem_pthread.dylib"
},
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"arch" : "x86_64",
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"uuid" : "8cc28466-fd2f-3c80-9834-9525b7beac19",
"path" : "\/usr\/lib\/system\/libsystem_kernel.dylib",
"name" : "libsystem_kernel.dylib"
},
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"arch" : "x86_64",
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"CFBundleIdentifier" : "com.apple.Foundation",
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"name" : "Foundation",
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}
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"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" : {
},
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},
{
"rolloutId" : "60f8ddccefea4203d95cbeef",
"factorPackIds" : {
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]
}
}
Here is my code:
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)
}
}
CodePudding user response：
@StateObject aren't init during previewing so that is probably causing the crash. You could workaround it by previewing AppContainerView instead of ContentView.
By the way, @StateObject is for when you need to store a reference type in a @State but in this example don't need a reference type. Also, NavigationPath is designed to hold the data values, not routes. You can use multiple navigationDestination for each kind of value, instead of one with a switch statement.