我正在使用iPhone应用和使用Core Data的Mac应用。
我希望这两个应用程序通过iCloud存储同步他们的数据库。
我已对managedObjectContext＆amp;的实施进行了调整。 persistentStoreCoordinator＆amp;添加mergeiCloudChanges - 来自更新的食谱示例代码：
#pragma mark -
#pragma mark Core Data stack
// this takes the NSPersistentStoreDidImportUbiquitousContentChangesNotification
// and transforms the userInfo dictionary into something that
// -[NSManagedObjectContext mergeChangesFromContextDidSaveNotification:] can consume
// then it posts a custom notification to let detail views know they might want to refresh.
// The main list view doesn't need that custom notification because the NSFetchedResultsController is
// already listening directly to the NSManagedObjectContext
- (void)mergeiCloudChanges:(NSNotification*)note forContext:(NSManagedObjectContext*)moc {
NSLog(@"merging iCloud stuff");
[moc mergeChangesFromContextDidSaveNotification:note];
NSNotification* refreshNotification = [NSNotification notificationWithName:@"RefreshAllViews" object:self userInfo:[note userInfo]];
[[NSNotificationCenter defaultCenter] postNotification:refreshNotification];
}
/**
Returns the managed object context for the application.
If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application.
*/
- (NSManagedObjectContext *)managedObjectContext
{
if (managedObjectContext != nil)
{
return managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil)
{
if (IOS_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.0")) {
NSManagedObjectContext* moc = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
[moc performBlockAndWait:^{
[moc setPersistentStoreCoordinator: coordinator];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(mergeChangesFrom_iCloud:) name:NSPersistentStoreDidImportUbiquitousContentChangesNotification object:coordinator];
}];
managedObjectContext = moc;
} else {
managedObjectContext = [[NSManagedObjectContext alloc] init];
[managedObjectContext setPersistentStoreCoordinator:coordinator];
}
}
return managedObjectContext;
}
// NSNotifications are posted synchronously on the caller's thread
// make sure to vector this back to the thread we want, in this case
// the main thread for our views & controller
- (void)mergeChangesFrom_iCloud:(NSNotification *)notification {
NSManagedObjectContext* moc = [self managedObjectContext];
// this only works if you used NSMainQueueConcurrencyType
// otherwise use a dispatch_async back to the main thread yourself
[moc performBlock:^{
[self mergeiCloudChanges:notification forContext:moc];
}];
}
/**
Returns the managed object model for the application.
If the model doesn't already exist, it is created by merging all of the models found in the application bundle.
*/
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel != nil) {
return managedObjectModel;
}
managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
return managedObjectModel;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (persistentStoreCoordinator__ != nil) {
return persistentStoreCoordinator__;
}
// assign the PSC to our app delegate ivar before adding the persistent store in the background
// this leverages a behavior in Core Data where you can create NSManagedObjectContext and fetch requests
// even if the PSC has no stores. Fetch requests return empty arrays until the persistent store is added
// so it's possible to bring up the UI and then fill in the results later
persistentStoreCoordinator__ = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
// prep the store path and bundle stuff here since NSBundle isn't totally thread safe
NSPersistentStoreCoordinator* psc = persistentStoreCoordinator__;
NSString *storePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"MyApp.sqlite"];
// do this asynchronously since if this is the first time this particular device is syncing with preexisting
// iCloud content it may take a long long time to download
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *storeUrl = [NSURL fileURLWithPath:storePath];
// this needs to match the entitlements and provisioning profile
NSURL *cloudURL = [fileManager URLForUbiquityContainerIdentifier:nil];
NSString* coreDataCloudContent = [[cloudURL path] stringByAppendingPathComponent:@"MyApp"];
cloudURL = [NSURL fileURLWithPath:coreDataCloudContent];
NSLog(@"cloudURL: %@", cloudURL);
// The API to turn on Core Data iCloud support here.
NSDictionary* options = [NSDictionary dictionaryWithObjectsAndKeys:@"xxxxxxxx.com.me.MyApp",
@"MyApp",
cloudURL,
NSPersistentStoreUbiquitousContentURLKey,
[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]) {
/*
Replace this implementation with code to handle the error appropriately.
abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button.
Typical reasons for an error here include:
* The persistent store is not accessible
* The schema for the persistent store is incompatible with current managed object model
Check the error message to determine what the actual problem was.
*/
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
[psc unlock];
// tell the UI on the main thread we finally added the store and then
// post a custom notification to make your views do whatever they need to such as tell their
// NSFetchedResultsController to -performFetch again now there is a real store
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"asynchronously added persistent store!");
[[NSNotificationCenter defaultCenter] postNotificationName:@"RefetchAllDatabaseData" object:self userInfo:nil];
});
});
return persistentStoreCoordinator__;
}
当我构建/运行myapp时，我可以看到文件出现在我的“/ Users / me / Library / Mobile Documents”目录中。
但我不知道它是否正在同步到iCloud存储 - 显然iphone和mac之间的数据没有同步。
我需要实现其他方法才能使数据迁移到云端吗？
我有什么方法可以查看iCloud存储上实际存在哪些文档？
答案 0 :(得分：3)
这是一个快速的部分答案。
您可以看到iCloud中存储的内容：
在Mac上：
System Preferences.app - ＆gt; iCloud - ＆gt;点击“管理...”，您将看到包含存储在Mac OS X或iOS中的文档的所有应用的列表。
在iOS上：
偏好设置 - ＆gt; iCloud - ＆gt;存档＆amp;备份 - ＆gt; 选项下面的选项您将看到所有包含Mac OS X或iOS文档的应用程序列表。
只要您使用NSFileManager setUbiquitous: itemAtURL: destinationURL: error:，就应该将这些文件发送给iCloud并显示在其他设备上。
答案 1 :(得分：1)
另一个部分答案。如果您还没有，请查看：http://www.raywenderlich.com/6015/beginning-icloud-in-ios-5-tutorial-part-1。我正在做同样的事情，即Mac App和iOS 应用分享数据。祝好运。标记
我刚刚了解到：http://mentalfaculty.tumblr.com/archive 寻找“Under The Sheets”CoreData和iCloud。看看吧！
答案 2 :(得分：0)
确定我的代码看起来有点不同，我在一个单独的类中将它重用于我的所有项目。然而，如果启用了iCloud（URLForUbiquityContainerIdentifier：nil return not nil），我就像这样设置我的NSPersistentStoreCoordinator：
// ---- iCloud Setup
// fist container in entitlements
NSURL *iCloudDirectoryURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
// if iCloud is enabled setup the store
if (iCloudDirectoryURL) {
__iCloudEnabled = true;
NSLog(@"iCloud:%@", [iCloudDirectoryURL absoluteString]);
// AppDelegate has to provide the contentnamekey
NSString *contentNameKey = [appDelegate dataStoreContentNameKey];
options = [NSDictionary dictionaryWithObjectsAndKeys:contentNameKey, NSPersistentStoreUbiquitousContentNameKey, iCloudDirectoryURL, NSPersistentStoreUbiquitousContentURLKey, nil];
}
我想念你在哪里设置NSPersistentStoreUbiquitousContentNameKey。
第二个很清楚，我猜，这只适用于设备，你的App ID需要启用iCloud。