Swift - 向 Core Data 添加启用 iCloud 的持久存储

Posted 2023-03-05

【中文标题】Swift - 向 Core Data 添加启用 iCloud 的持久存储

【英文标题】：Swift - Adding an iCloud-Enabled Persistent Store to Core Data

【发布时间】：2014-12-18 12:06:59

【问题描述】：

var appDel:AppDelegate = (UIApplication.sharedApplication().delegate as AppDelegate)
let documentsDirectory:NSURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL
let storeUrl:NSURL = documentsDirectory.URLByAppendingPathComponent("CoreData.sqlite")
var error:NSError?
let coordinator:NSPersistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: appDel.managedObjectModel)
let storeOptions:NSDictionary = [NSPersistentStoreUbiquitousContentNameKey:"MyAppCloudStore"]
let store:NSPersistentStore = coordinator.addPersistentStoreWithType("NSSQLiteStoreType", configuration: nil, URL: storeUrl, options: storeOptions, error: &error)!
let finaliCloudURL = store.URL

这给我带来了一个错误：

2014-12-18 13:55:59.160 TestApp[1410:314557] CoreData: error: -addPersistentStoreWithType:NSSQLiteStoreType configuration:(null) URL:file:///Users/Bogdan-iMac/Library/Developer/CoreSimulator/Devices/29BD765A-1F4A-4C8A-8EAE-4AA0B1E91918/data/Containers/Data/Application/F19B3C5D-B6AD-4944-B4F3-BBBE4AF36D66/Documents/CoreData.sqlite options:
    NSPersistentStoreUbiquitousContentNameKey = MyAppCloudStore;
 ... returned error Error Domain=NSCocoaErrorDomain Code=134080 "The NSSQLiteStoreType persistent store type does not support iCloud integration." UserInfo=0x79fc9360 NSLocalizedDescription=The NSSQLiteStoreType persistent store type does not support iCloud integration. with userInfo dictionary 
    NSLocalizedDescription = "The NSSQLiteStoreType persistent store type does not support iCloud integration.";

fatal error: unexpectedly found nil while unwrapping an Optional value

我在 Capabilities with Services:Key-value storage 中启用了 iCloud

【参考方案1】：

NSSQLiteStoreType 是一个已定义的常量值。您需要使用NSSQLiteStoreType，而不是@NSSQLiteStoreType"。虽然NSSQLiteStoreType是一个字符串，但它的值不是@"NSSQLiteStoreType"。

【讨论】：

let store:NSPersistentStore = coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: storeUrl, options: storeOptions, error: &error)!