我正在尝试将 CoreData 实现到我的 iOS 应用程序中。我想将对象添加到列表中并保存它们。不幸的是，我的应用程序崩溃并且无法运行。
在我的 SwiftUI 应用程序中实现 CoreData 后，我的应用程序不断崩溃。
这是我的主要代码:
struct Log: View {
@Environment(\.managedObjectContext) var managedObjectContext
@FetchRequest(fetchRequest: ExerciseForWorkout.getAllExerciseForWorkout()) var loggedExercise: FetchedResults<ExerciseForWorkout>
@State private var newLoggedExercise = ""
@State private var newReps = 0
var body: some View {
NavigationView {
List{
Section(header: Text("Add Exercise")) {
HStack {
TextField("Exercise", text: $newLoggedExercise)
Stepper("Reps", value: $newReps, in: 0...24)
Button(action: {
let loggedExerciseNew = ExerciseForWorkout(context: self.managedObjectContext)
loggedExerciseNew.name = self.newLoggedExercise
loggedExerciseNew.reps = self.newReps
loggedExerciseNew.dateCreated = Date()
do {
try self.managedObjectContext.save()
} catch {
print("Error while saving !!!")
print(error)
}
self.newLoggedExercise = ""
}) {
Image(systemName: "plus.circle.fill")
.foregroundColor(Color.green)
.imageScale(.large)
}
}
}
.font(.headline)
Section(header: Text("Today's Workout")) {
ForEach(self.loggedExercise) { log in
HStack {
Text(log.name!)
Text("Reps : \(log.reps)")
}
}
Text("test")
}
}
}
.navigationBarTitle(Text("Log"))
.navigationBarItems(trailing: EditButton())
}
}
这是我的ExerciseForWorkout 类(class):
import Foundation
import CoreData
public class ExerciseForWorkout: NSManagedObject, Identifiable {
@NSManaged public var reps: Int
@NSManaged public var dateCreated: Date?
@NSManaged public var name: String?
}
extension ExerciseForWorkout {
static func getAllExerciseForWorkout() -> NSFetchRequest<ExerciseForWorkout> {
let request:NSFetchRequest<ExerciseForWorkout> = ExerciseForWorkout.fetchRequest() as! NSFetchRequest<ExerciseForWorkout>
let sortDescriptor = NSSortDescriptor(key: "dateCreated", ascending: true)
request.sortDescriptors = [sortDescriptor]
return request
}
}
崩溃报告:
Thread 0 Crashed:
0 com.apple.SwiftUI 0x00007fff2c57a3fd FetchRequest.wrappedValue.getter + 269
1 com.yonatanbensimon.project.gymappswiftuivone 0x0000000104f5463c Log.loggedExercise.getter + 300
2 Log.2.preview-thunk.dylib 0x00000001055f8bb4 closure #2 in closure #1 in closure #1 in Log.__preview__body.getter + 260
3 Log.2.preview-thunk.dylib 0x00000001055f8f1d partial apply for closure #2 in closure #1 in closure #1 in Log.__preview__body.getter + 13
4 com.apple.SwiftUI 0x00007fff2c280f9a Section<>.init(header:footer:content:) + 170
5 com.apple.SwiftUI 0x00007fff2c281b24 Section<>.init(header:content:) + 36
6 Log.2.preview-thunk.dylib 0x00000001055f73b6 closure #1 in closure #1 in Log.__preview__body.getter + 1718
7 Log.2.preview-thunk.dylib 0x00000001055f748c partial apply for closure #1 in closure #1 in Log.__preview__body.getter + 12
8 com.apple.SwiftUI 0x00007fff2c27b923 List<>.init(content:) + 83
9 Log.2.preview-thunk.dylib 0x00000001055f65fc closure #1 in Log.__preview__body.getter + 380
10 Log.2.preview-thunk.dylib 0x00000001055f6c5c partial apply for closure #1 in Log.__preview__body.getter + 12
11 com.apple.SwiftUI 0x00007fff2c0be646 NavigationView.init(content:) + 54
12 Log.2.preview-thunk.dylib 0x00000001055f4fc7 Log.__preview__body.getter + 391
13 com.yonatanbensimon.project.gymappswiftuivone 0x0000000104f55e6b Log.body.getter + 91 (Log.swift:19)
14 com.yonatanbensimon.project.gymappswiftuivone 0x0000000104f5a569 protocol witness for View.body.getter in conformance Log + 9
15 com.apple.SwiftUI 0x00007fff2c048067 DynamicPropertyBody.update(context:) + 1671
16 com.apple.SwiftUI 0x00007fff2c048890 protocol witness for static UntypedAttribute._update(_:graph:attribute:) in conformance DynamicPropertyBody<A> + 32
17 ??? 0x00007fff2f8c0c69 0 + 140733991095401
18 ??? 0x00007fff2f8a8ac5 0 + 140733990996677
19 ??? 0x00007fff2f8a8d83 0 + 140733990997379
20 ??? 0x00007fff2f8ac267 0 + 140733991010919
21 com.apple.SwiftUI 0x00007fff2c2e7cff AnyViewList.update(context:) + 671
22 com.apple.SwiftUI 0x00007fff2c2ea5ed partial apply for protocol witness for static UntypedAttribute._update(_:graph:attribute:) in conformance AnyViewList + 29
23 ??? 0x00007fff2f8a8ac5 0 + 140733990996677
24 ??? 0x00007fff2f8a8d83 0 + 140733990997379
25 ??? 0x00007fff2f8abf08 0 + 140733991010056
26 ??? 0x00007fff2f8b9dbb 0 + 140733991067067
27 com.apple.SwiftUI 0x00007fff2bfb6677 closure #1 in View.withChildrenForTest<A>(environment:options:body:) + 279
28 com.apple.SwiftUI 0x00007fff2bfb650d View.withChildrenForTest<A>(environment:options:body:) + 205
29 com.apple.SwiftUI 0x00007fff2c1ff21a View._allPreviews.getter + 90
30 com.apple.SwiftUI 0x00007fff2c1ff18d MakePreviews.visit<A>(type:) + 109
31 com.apple.SwiftUI 0x00007fff2c5fa8b2 _callVisitViewType2 + 34
32 com.apple.SwiftUI 0x00007fff2c1ff0ee static _PreviewProvider._allPreviews.getter + 174
33 com.apple.dt.XCPreviewKit 0x0000000105589307 0x10556e000 + 111367
34 com.apple.dt.XCPreviewKit 0x0000000105574fb0 0x10556e000 + 28592
35 com.apple.dt.XCPreviewKit 0x0000000105585e8b 0x10556e000 + 97931
36 com.apple.dt.XCPreviewKit 0x0000000105585e34 0x10556e000 + 97844
37 com.apple.dt.XCPreviewKit 0x00000001055867c9 0x10556e000 + 100297
38 com.apple.dt.XCPreviewKit 0x0000000105584e31 0x10556e000 + 93745
39 com.apple.dt.XCPreviewKit 0x0000000105585159 0x10556e000 + 94553
40 ??? 0x00007fff5223e848 0 + 140734571472968
41 ??? 0x00007fff5223f7b9 0 + 140734571476921
42 ??? 0x00007fff5224bc9b 0 + 140734571527323
43 com.apple.CoreFoundation 0x00007fff23bd4049 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
44 com.apple.CoreFoundation 0x00007fff23bceca9 __CFRunLoopRun + 2329
45 com.apple.CoreFoundation 0x00007fff23bce066 CFRunLoopRunSpecific + 438
46 com.apple.GeoServices 0x00007fff384c0bb0 GSEventRunModal + 65
47 com.apple.UIKitCore 0x00007fff48092d4d UIApplicationMain + 1621
48 com.yonatanbensimon.project.gymappswiftuivone 0x0000000104f5346b main + 75 (AppDelegate.swift:13)
49 libdyld.dylib 0x00007fff5227ec25 start + 1
Thread 1:
0 ??? 0x00007fff52462818 0 + 140734573717528
Thread 2:
0 ??? 0x00007fff52462818 0 + 140734573717528
Thread 3:
0 ??? 0x00007fff52462818 0 + 140734573717528
Thread 4:
0 ??? 0x00007fff52462818 0 + 140734573717528
Thread 5:
0 ??? 0x00007fff52462818 0 + 140734573717528
Thread 6:: com.apple.uikit.eventfetch-thread
0 libsystem_kernel.dylib 0x00007fff523b625a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff523b65d0 mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff23bd3cf5 __CFRunLoopServiceMachPort + 197
3 com.apple.CoreFoundation 0x00007fff23bcea17 __CFRunLoopRun + 1671
4 com.apple.CoreFoundation 0x00007fff23bce066 CFRunLoopRunSpecific + 438
5 com.apple.Foundation 0x00007fff2576b86f -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 211
6 com.apple.Foundation 0x00007fff2576bae2 -[NSRunLoop(NSRunLoop) runUntilDate:] + 72
7 com.apple.UIKitCore 0x00007fff48135028 -[UIEventFetcher threadMain] + 138
8 com.apple.Foundation 0x00007fff257817a7 __NSThread__start__ + 1047
9 ??? 0x00007fff52466e65 0 + 140734573735525
10 ??? 0x00007fff5246283b 0 + 140734573717563
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x000000000000001c rdx: 0x0000000000000303
rdi: 0x00007fff89e0b600 rsi: 0x0000000000000303 rbp: 0x00007ffeeacaa950 rsp: 0x00007ffeeacaa910
r8: 0x00007f8085821950 r9: 0x000000000000003f r10: 0x00007ffeeacae178 r11: 0xffffffffffffff68
r12: 0x00007fff89e4fff0 r13: 0x000060000190a520 r14: 0x00007ffeeacaab40 r15: 0x0000000000000000
rip: 0x00007fff2c57a3fd rfl: 0x0000000000010246 cr2: 0x00007fff2c282090
它一直崩溃，我不知道为什么会崩溃。
我发布的不是完整的崩溃报告，因为该文件包含太多字符。我发布了我认为报告的核心部分。
最佳答案
一切都在我这边进行。我有时在使用 CoreData 时遇到的问题是 ENTITIES 信息不正确。
我的看起来像这样:
主要是 Module、Name、Codegen 属性必须正确。
关于ios - 在 Swift UI 中实现核心数据而不崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59573178/