访问 CoreData SharedData.sharedInstance.managedObjectContext 时的 EXC_BAD_ACCESS (code=1, address=0x30)

Question

我最近升级到 Xcode 11.2.1 和最新的 iOS 13.2.2，现在出现错误

EXC_BAD_ACCESS（代码=1，地址=0x30）

出错的行从 forEach 循环中调用了大约 2000 次。

如果我在错误行设置断点并在调试状态下运行代码，则不会发生崩溃

如果我在错误语句之前添加 print print("Hi mom") ，则不会发生错误

我很确定添加打印语句只是绕过实际错误，可能会在以后或在不同的 iOS 设置或较低频率下发生。

        else if actionFigureSpecificsCoreData != nil {
            coreDataUpdateDate = self.actionFigureSpecificsCoreData!.updateDate! as Date

            // WARNING:  Not saving here intentionally as no actual changes are being made - see save functions
            // WARNING:  dont create the iCloud record at this point otherwise the save context may error for null values create the record

            // if the coreData record exists without all defaults and the iCloud record doesn't exist, create the iCloud record.
            // case where device was off-line
            if self.isActionFigureSpecificsCoreDataDefaultValues() == false {
                //                                #if DEBUG
                //                                    print("No iCloud record for Saving from non-default coreData \(self.actionFigureSpecificsGlobalUniqueId) on \(kActionFigureSpecificsRecord)")
                //                                #endif
                isCloudSaveNeeded = true
                shouldSetCloudDataToCore = true
            }
        }
        // if both core data and cloud are nil, set the core data record
        else {

<<<<<<<<-------------crashes on the next line unless I add in a print statement ----------------->>>>>>>

            self.actionFigureSpecificsCoreData = ActionFigureSpecificsCoreData(context: SharedData.sharedInstance.managedObjectContext!)
            self.actionFigureSpecificsCoreData!.actionFigureRecordName = self.actionFigureGlobalUniqueId

            // want it and have it are set to defaults by core data
            self.actionFigureSpecificsCoreData!.updateDate = NSDate() as Date

            // all other values are set to the database defaults
        }

class SharedData {

    // core data
    var appDelegate: AppDelegate!
    var managedObjectContext: NSManagedObjectContext!

    // in app purchases
    var isRemoveAdInAppPurchase: Bool = false

    class var sharedInstance: SharedData {
        struct Singleton {
            static let instance = SharedData()
        }

        return Singleton.instance
    }

    init() {

        // set core data database properties
        //self.appDelegate = UIApplication.shared.delegate as! AppDelegate
        self.appDelegate = UIApplication.shared.delegate as? AppDelegate
        self.managedObjectContext = self.appDelegate.persistentContainer.viewContext
    }

苹果崩溃日志的顶部

{"app_name":"My Toy Chest","timestamp":"2019-11-13 07:18:28.55 -0800","app_version":"6.037","slice_uuid":"6ae4b8f2-ac29-3b31-87a8-3ebf4634251f","adam_id":1217665205,"build_version":"1","bundleID":"com.LightningBrainGames.My-Toy-Chest","share_with_app_devs":false,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 13.2.2 (17B102)","incident_id":"41DB21DA-774E-42C1-B340-425689BBCB6A","name":"My Toy Chest"}
Incident Identifier: 41DB21DA-774E-42C1-B340-425689BBCB6A
CrashReporter Key:   43b464acde1fb0315e3dc82db0fb5a581b250135
Hardware Model:      xxx
Process:             My Toy Chest [478]
Path:                /private/var/containers/Bundle/Application/5E9921A8-1895-4880-864B-F1D2A0DCDE3B/My Toy Chest.app/My Toy Chest
Identifier:          com.LightningBrainGames.My-Toy-Chest
Version:             1 (6.037)
AppStoreTools:       11B48b
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           com.LightningBrainGames.My-Toy-Chest [590]


Date/Time:           2019-11-13 07:18:28.0713 -0800
Launch Time:         2019-11-13 07:18:18.5049 -0800
OS Version:          iPhone OS 13.2.2 (17B102)
Release Type:        User
Baseband Version:    n/a
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x000000018cf8fec4 __pthread_kill + 8
1   libsystem_pthread.dylib         0x000000018ceab774 pthread_kill$VARIANT$mp + 112
2   libsystem_c.dylib               0x000000018cdff844 abort + 100
3   libsystem_malloc.dylib          0x000000018ce98b80 _malloc_put + 0
4   libsystem_malloc.dylib          0x000000018ce98df4 malloc_zone_error + 100
5   libsystem_malloc.dylib          0x000000018ce84044 szone_free + 452
6   CoreFoundation                  0x000000018d1bd468 __CFBasicHashDrain + 420
7   CoreData                        0x0000000191a475ec -[NSManagedObjectContext+ 71148 (_NSInternalChangeProcessing) _processRecentChanges:] + 832
8   CoreData                        0x0000000191b746d0 _performRunLoopAction + 368
9   CoreFoundation                  0x000000018d114c2c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
10  CoreFoundation                  0x000000018d10fb18 __CFRunLoopDoObservers + 416
11  CoreFoundation                  0x000000018d1100e4 __CFRunLoopRun + 1308
12  CoreFoundation                  0x000000018d10f8a0 CFRunLoopRunSpecific + 464
13  GraphicsServices                0x0000000197067328 GSEventRunModal + 104
14  UIKitCore                       0x0000000191200740 UIApplicationMain + 1936
15  My Toy Chest                    0x00000001001f95e4 0x1001f4000 + 21988
16  libdyld.dylib                   0x000000018cf9a360 start + 4```