我有一个很难解决的问题。我有这种情况：
我的应用程序使用 CoreData 来存储对象，我想在设备之间实现 iCloud 同步......而我的应用程序需要一个初始填充数据库。
我第一次启动我的应用程序时，它将在云上填充我的数据库，并将某些 db'fields 标记为“是”为“databaseInstalled”。这些字段也在云端同步。
现在，当另一台设备第一次启动该应用程序时，我希望检索“databaseInstalled”字段以检查是否注入了一些数据，但这是错误的......
如果 databaseInstalled 为 false，我们注入数据，如果 databaseInstalled 为 true，我们等待 iCloud 同步。
问题是我异步检索persistentStoreCoordinator，因为我不想阻止正在等待从iCloud下载数据的应用程序......
那么，如果我需要填充数据库或者它已经在另一台设备上填充并且我只是从 iCloud 下载填充的数据库，我怎么能知道先验呢？
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if((__persistentStoreCoordinator != nil)) {
return __persistentStoreCoordinator;
}
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
NSPersistentStoreCoordinator *psc = __persistentStoreCoordinator;
// Set up iCloud in another thread:
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// ** Note: if you adapt this code for your own use, you MUST change this variable:
NSString *iCloudEnabledAppID = @"this is a secret!";
// ** Note: if you adapt this code for your own use, you should change this variable:
NSString *dataFileName = @"you do not have to know.sqlite";
// ** Note: For basic usage you shouldn't need to change anything else
NSString *iCloudDataDirectoryName = @"Data.nosync";
NSString *iCloudLogsDirectoryName = @"Logs";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];
if (iCloud) {
NSLog(@"iCloud is working");
NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];
NSLog(@"iCloudEnabledAppID = %@",iCloudEnabledAppID);
NSLog(@"dataFileName = %@", dataFileName);
NSLog(@"iCloudDataDirectoryName = %@", iCloudDataDirectoryName);
NSLog(@"iCloudLogsDirectoryName = %@", iCloudLogsDirectoryName);
NSLog(@"iCloud = %@", iCloud);
NSLog(@"iCloudLogsPath = %@", iCloudLogsPath);
// da rimuovere
//[fileManager removeItemAtURL:iCloudLogsPath error:nil];
#warning to remove
if([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
NSError *fileSystemError;
[fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
withIntermediateDirectories:YES
attributes:nil
error:&fileSystemError];
if(fileSystemError != nil) {
NSLog(@"Error creating database directory %@", fileSystemError);
}
}
NSString *iCloudData = [[[iCloud path]
stringByAppendingPathComponent:iCloudDataDirectoryName]
stringByAppendingPathComponent:dataFileName];
//[fileManager removeItemAtPath:iCloudData error:nil];
#warning to remove
NSLog(@"iCloudData = %@", iCloudData);
NSMutableDictionary *options = [NSMutableDictionary dictionary];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
[options setObject:iCloudEnabledAppID forKey:NSPersistentStoreUbiquitousContentNameKey];
[options setObject:iCloudLogsPath forKey:NSPersistentStoreUbiquitousContentURLKey];
[psc lock];
[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:[NSURL fileURLWithPath:iCloudData]
options:options
error:nil];
[psc unlock];
}
else {
NSLog(@"iCloud is NOT working - using a local store");
NSLog(@"Local store: %@", localStore.path);
NSMutableDictionary *options = [NSMutableDictionary dictionary];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
[psc lock];
[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:localStore
options:options
error:nil];
[psc unlock];
}
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"iCloud routine completed.");
Setup *install = [[Setup alloc] init];
if([install shouldMigrate]) {
HUD = [[MBProgressHUD alloc] initWithView:self.window.rootViewController.view];
HUD.delegate = self;
HUD.labelText = NSLocalizedString(@"Sincronizzazione del database", nil);
[self.window.rootViewController.view addSubview:HUD];
[HUD showWhileExecuting:@selector(installDatabase) onTarget:install withObject:nil animated:YES];
}
else {
[[NSNotificationCenter defaultCenter] postNotificationName:@"setupCompleted" object:self];
}
//[[NSNotificationCenter defaultCenter] postNotificationName:@"icloudCompleted" object:self userInfo:nil];
[[NSNotificationCenter defaultCenter] postNotificationName:@"setupCompleted" object:self];
});
});
return __persistentStoreCoordinator;
}