将 CoreData 保存到 iCloud (Swift)

Question

我已经有CoreData了，现在想存一个数据到iCloud

在AppDelegate.swift

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
        var coordinator: NSPersistentStoreCoordinator =
        NSPersistentStoreCoordinator (managedObjectModel: self.managedObjectModel)

        var storeURL =
        self.applicationDocumentsDirectory
            .URLByAppendingPathComponent("DeviceCoreData.sqlite")

        var storeOptions =
        [NSPersistentStoreUbiquitousContentNameKey : "MyDevices"
            // NSPersistentStoreRebuildFromUbiquitousContentOption: @(true)
        ]

        //
        self.registerCoordinatorForStoreNotifications (coordinator)

        var error : NSError? = nil
        var store : NSPersistentStore! =
        coordinator.addPersistentStoreWithType (NSSQLiteStoreType,
            configuration: nil,
            URL: storeURL,
            options: storeOptions,
            error: &error)

        if nil == store {
            // handle error
        }

        return coordinator
        }()

func registerCoordinatorForStoreNotifications (coordinator : NSPersistentStoreCoordinator) {
    let nc : NSNotificationCenter = NSNotificationCenter.defaultCenter();

    nc.addObserver(self, selector: "handleStoresWillChange:",
        name: NSPersistentStoreCoordinatorStoresWillChangeNotification,
        object: coordinator)

    nc.addObserver(self, selector: "handleStoresDidChange:",
        name: NSPersistentStoreCoordinatorStoresDidChangeNotification,
        object: coordinator)

    nc.addObserver(self, selector: "handleStoresWillRemove:",
        name: NSPersistentStoreCoordinatorWillRemoveStoreNotification,
        object: coordinator)

    nc.addObserver(self, selector: "handleStoreChangedUbiquitousContent:",
        name: NSPersistentStoreDidImportUbiquitousContentChangesNotification,
        object: coordinator)
}

但是当我构建应用程序时，我收到一条错误消息

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Ơn_Giời.AppDelegate handleStoresDidChange:]: unrecognized selector sent to instance 0x17668770'

有人可以帮助我吗？我在这里堆了3天。

和

[NSPersistentStoreUbiquitousContentNameKey : "MyDevices"]

这个密钥是否正确？我的 cloudkit 名为 iCloud.MyDevices 感谢您的帮助...

Answer 1

这一行：

nc.addObserver(self, selector: "handleStoresDidChange:",
    name: NSPersistentStoreCoordinatorStoresDidChangeNotification,
    object: coordinator)

表示当发布该通知时，应该在对象 self（显然是应用程序委托）

上调用名为 handleStoresDidChange: 的方法

错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Ơn_Giời.AppDelegate handleStoresDidChange:]: unrecognized selector sent to instance 0x17668770'

表示 AppDelegate 没有名为 handleStoresDidChange: 的方法。

这就是应用程序崩溃的原因：您已指示通知中心调用不存在的方法。如果你告诉通知中心它应该调用一个方法，那个方法必须存在。您需要创建该方法或告诉通知中心调用其他确实存在的方法。

将 CoreData 保存到 iCloud (Swift)

Save CoreData to iCloud (Swift)

ios

swift

core-data

icloud