ios - 从 iCloud 中删除核心数据失败

Question

我正在尝试使用 [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:options:error:] 从 iCloud 中删除核心数据。但是我得到了奇怪的输出:

__93+[NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:options:error:]_block_invoke(1982):
CoreData: Ubiquity:  Unable to move content directory to new location:
file:///private/var/mobile/Library/Mobile%20Documents/<UBIQUITY_ID>/    
New: file:///private/var/mobile/Library/Mobile%20Documents/OldUbiquitousContent-mobile~C9439AD0-1E87-4977-9C68-0674F5E2E93B
Error Domain=NSCocoaErrorDomain Code=513 "The operation couldn’t be completed.
(Cocoa error 513.)" UserInfo=0x181ab790 {NSSourceFilePathErrorKey=/private/var/mobile/Library/Mobile Documents/<UBIQUITY_ID>,     
NSUserStringVariant=(
    Move
), NSFilePath=/private/var/mobile/Library/Mobile Documents/<UBIQUITY_ID>,
NSDestinationFilePath=/private/var/mobile/Library/Mobile Documents/OldUbiquitousContent-mobile~C9439AD0-1E87-4977-9C68-0674F5E2E93B,
NSUnderlyingError=0x181aab50 "The operation couldn’t be completed. Operation not permitted"}

什么意思？

如何避免？我正在研究 iCloud 禁用/启用功能。详情 HERE

更新:

  NSDictionary *iCloudOptions =
  [NSDictionary dictionaryWithObjectsAndKeys:kICloudContentNameKey, NSPersistentStoreUbiquitousContentNameKey,
   iCloudURL, NSPersistentStoreUbiquitousContentURLKey, nil];

// self.lastICloudStoreURL stores NSPersistentStore.URL after stack setup
  BOOL result = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:self.lastICloudStoreURL
                                                                                     options:iCloudOptions
                                                                                       error:&error];

Answer 1

通常(在 iOS7 之前)，您从 [fileManager URLForUbiquityContainerIdentifier:nil]; 中获取 ubiquitousContentURL 值 并将其作为名为 NSPersistentStore UbiquitousContentURLKey 的选项传递，这就是 iCloud 知道将您的所有数据保存在 iCloud 帐户中的位置的方式。

在 iOS 7 和 Mac OS X 中，我们根本不需要为此传递值，Apple 会在后台自动为您调用 URLForUbiquitous ContainerIdentifier。

所以解决方案是这样的:

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:kICloudContentNameKey, NSPersistentStoreUbiquitousContentNameKey, nil];
NSURL *storeURL = [NSPersistentStore MR_urlForStoreName:[MagicalRecord defaultStoreName]];
BOOL result = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:storeURL options:options error:&error];

我建议您查看 WWDC 2013 session 207 以清楚地了解这些内容。