我已经有了一个CoreData，那么现在我想保存一个数据到iCloud。在AppDelegate.swift中lazyvarpersistentStoreCoordinator:NSPersistentStoreCoordinator?={varcoordinator:NSPersistentStoreCoordinator=NSPersistentStoreCoordinator(managedObjectModel:self.managedObjectModel)varstoreURL=self.applicationDocumentsDirectory.URLByAppendin