我正在一个现有应用程序中使用Core Data。现在我想集成iCloud,以便用户可以在他们的iOS设备之间同步他们的内容。为此,我已经为我的NSPersistentStoreCoordinator编写了以下代码(当然,在我的代码中填充了占位符):
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (persistentStoreCoordinator_ != nil) {
return persistentStoreCoordinator_;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"<DB_Name>.sqlite"];
persistentStoreCoordinator_ = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
NSPersistentStoreCoordinator* psc = persistentStoreCoordinator_;
if (IOS_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.0")) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSFileManager *fileManager = [NSFileManager defaultManager];
// Migrate datamodel
NSDictionary *options = nil;
// this needs to match the entitlements and provisioning profile
NSURL *cloudURL = [fileManager URLForUbiquityContainerIdentifier:@"<App_Identifier>"];
NSString* coreDataCloudContent = [[cloudURL path] stringByAppendingPathComponent:@"data"];
if ([coreDataCloudContent length] != 0) {
// iCloud is available
cloudURL = [NSURL fileURLWithPath:coreDataCloudContent];
options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
@"<App_Name>.store", NSPersistentStoreUbiquitousContentNameKey,
cloudURL, NSPersistentStoreUbiquitousContentURLKey,
nil];
} else {
// iCloud is not available
options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
nil];
}
NSError *error = nil;
[psc lock];
if (![psc addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
}
[psc unlock];
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"asynchronously added persistent store!");
[[NSNotificationCenter defaultCenter] postNotificationName:@"RefetchAllDatabaseData" object:self userInfo:nil];
});
});
} else {
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
nil];
NSError *error = nil;
if (![persistentStoreCoordinator_ addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
}
}
return persistentStoreCoordinator_;
}
使用这段代码后,所有新增的数据记录将在所有iOS设备之间自动同步,这正是它应该做的!
但我想要的是,所有现有的数据记录也在所有设备之间同步;但这并没有实现。现有记录仍然可用于应用程序,并且可以使用,但它们并未同步。
我需要做些什么才能让所有现有的数据记录也与iCloud同步?我已经尝试过使用方法。
migratePersistentStore:toURL:options:withType:error:
但是一直没有任何成功的进展。
非常感谢您的帮助!