ios - 无法从 iCloud 迁移永久存储
<p><p>我正在尝试从我的应用中的 <code>NSPersistentStore</code> 中删除 <code>iCloud</code> 同步功能。迁移不会返回任何错误，但是，启用 iCloud 的持久存储中的数据会在迁移后消失。</p>
<p>以下是我的相关代码:</p>
<pre><code>-(void)setUpCoreDataStackWithICloud
{
//Set up the model and context.
self.model = ;
self.context = [init];
;
if (==YES) {
;
NSUserDefaults *defaults = ;
forKey:@"lastLaunchOfAppiCloudWasEnabled"];
}else self.psc = ;
;
}
-(NSPersistentStoreCoordinator*)persistentStoreCoordinatorForUserThatAlreadyMigratedToiCloud
{
NSLog(@"persistentStoreCoordinatorForUserThatAlreadyMigratedToiCloud called");
NSPersistentStoreCoordinator *psc = [initWithManagedObjectModel:self.model];
NSError *error = nil;
NSPersistentStore *store = [psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:
options:
error:&error];
if (!store) {
NSLog(@"failed to add store with error %@",);
}else NSLog(@"successfully added store for user that has already migrated to iCloud");
NSDictionary *migrateOptions = @{ NSPersistentStoreRemoveUbiquitousMetadataOption : @YES,
NSMigratePersistentStoresAutomaticallyOption : @YES,
NSInferMappingModelAutomaticallyOption : @YES};
NSError *migrationError = nil;
NSPersistentStore *migratedStore = options:migrateOptions withType:NSSQLiteStoreType error:&migrationError];
if (migrationError) {
NSLog(@"Migration from iCloud enabled persistent store was unsuccessful. %@", migrationError.localizedDescription);
}else NSLog(@"The migration from the iCloud enabled persistent store was successful");
NSLog(@"The migrated store is %@", migratedStore);
return psc;
}
-(NSURL*)testNewestStoreURL{
NSString *path = ;
NSURL *storeURL = ;
return storeURL;
}
-(NSURL*)newStoreURL
{
NSString *path = ;
NSURL *storeURL = ;
return storeURL;
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>它不起作用的原因是因为我也在使用映射模型进行架构迁移。根据文档，iCloud 不支持此功能。即使我试图摆脱 iCloud，当涉及到架构迁移时，它也不允许访问数据。 </p></p>
<p style="font-size: 20px;">关于ios - 无法从 iCloud 迁移永久存储，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/33727390/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/33727390/
</a>
</p>
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