ios – 没有调用领域迁移

概述我已经为一个领域对象添加了一个值(我已将动态var inspectorName =“”添加到WeekReport对象中),我正在尝试迁移领域数据库以包含该值.我试图在func应用程序中调用迁移块(_ application：UIApplication,didFinishLaunchingWithOptions launchOptions：[UIApplicationLaunchOptionsKey 我已经为一个领域对象添加了一个值(我已将动态var inspectorname =“”添加到WeekReport对象中),我正在尝试迁移领域数据库以包含该值.我试图在func应用程序中调用迁移块(_ application：UIApplication,dIDFinishLaunchingWithOptions launchOptions：[UIApplicationLaunchOptionsKey：Any]？= nil),如下所示：

func application(_ application: UIApplication,dIDFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {    print("HERE")    Realm.Configuration.defaultConfiguration = Realm.Configuration(        schemaVersion: 1,migrationBlock: { migration,oldSchemaVersion in            if (oldSchemaVersion < 1) {                migration.enumerateObjects(ofType: WeekReport.classname()) { oldobject,newObject in                    newObject!["inspectorname"] = ""                }            }    })    return true}

但似乎在我的错误发生之前没有调用dIDFinishLaunchingWithOptions.

在多视图控制器中我让letm =尝试！领域().我运行应用程序时Xcode中断了：

“Migration is required due to the following errors:
– Property ‘WeekReport.inspectorname’ has been added.” UserInfo={NSLocalizedDescription=Migration is required due to the following errors:
– Property ‘WeekReport.inspectorname’ has been added.,Error Code=10}: file /library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-800.0.63/src/swift/

怎么没有调用迁移blick？ “HERE”从未打印过……

我应该在视图控制器中以不同的方式定义领域吗？

解决方法 如果你写letm = try！视图控制器中的Realm()作为实例变量,它将在应用程序之前调用：来自Storyboard的dIDFinishLaunchingWithOptions.要解决这个问题,你可以使用lazy var realm = try！ Realm()代替.延迟创建一个实例变量,直到访问该变量. 总结

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