iCloud 同步后 UITableView 不会重新加载（Swift 2）

Question

我有一个应用程序，我可以在其中通过 iCloud 同步我的核心数据。同步工作正常，但我在其中显示数据的 tableView（在名为“ResultsView”的视图中）在 iCloud 同步后不会重新加载；我需要转到另一个视图并返回我的 ResultsView 以查看更改。

这就是我处理核心数据同步的方式（在 AppDelegate.swift 中）：

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
    // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
    // Create the coordinator and store
    var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("MyApp.sqlite")
    var error: NSError? = nil
    var failureReason = "There was an error creating or loading the application's saved data."
    // iCloud store
    var storeOptions = [NSPersistentStoreUbiquitousContentNameKey : "MyAppStore",NSMigratePersistentStoresAutomaticallyOption: true,
        NSInferMappingModelAutomaticallyOption: true]
    // iCloud storeOptions need to be added to the if statement
    do {
        try coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: NSURL.fileURLWithPath(url.path!), options: storeOptions)
    } catch var error1 as NSError {
        error = error1
        coordinator = nil
        // Report any error we got.
        var dict = [String: AnyObject]()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason
        dict[NSUnderlyingErrorKey] = error
        error = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(error), \(error!.userInfo)")
        abort()
    } catch {
        fatalError()
    }

    return coordinator
}()

同样在 AppDelegate 中，通过 iCloud 处理更新：

// MARK: - iCloud
// This handles the updates to the data via iCLoud updates

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)
}

我在 ResultsView 的 viewWillAppear 方法中获取了我的核心数据，在 viewWillAppear 和 viewDidAppear 中也有 self.tableView.reloadData()。

我错过了什么？

提前致谢

Answer 1

[编辑 - 没有正确阅读问题！]

如果您的数据在视图打开时可以更改（这可能是因为 iCloud 同步是异步的）：您的视图需要知道它所基于的数据已经更改，因此在您的 CoreData 同步后调用 setNeedsDisplay on它。另见this SO answer。

如果您的数据在视图打开时无法更改，请在 viewWillAppear 中确保在调用 super 之前完全同步数据。请注意，与 iCloud 同步将是异步的，因此仅调用同步方法是不够的。可能更容易假设它会在如上所述打开视图时发生变化。