我有一个核心数据应用程序,我试图使用iCloud作为我的后端集成Ensembles框架。我有大部分工作,除了在一台设备上进行更改时,我必须进行更改并将上下文保存在另一台设备上,以便获取远程更改。
反映数据的tableview符合NSFetchedResultsControllerDelegate
。当本地数据更改并且它接收远程更改时,远程更改会正确反映。
实现“同步”按钮,手动调用syncWithCompletion
(下面)不会获取更改。
每隔两分钟发射一次的计时器,调用syncWithCompletion
,并没有接收到更改。
关闭然后再次打开同步确实会获取更改。
重新启动应用程序不会获取更改。
#pragma mark - ENSEMBLES
- (void)setupEnsembles {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
// set the sync UI on
[[NSNotificationCenter defaultCenter] postNotificationName:@"setSyncUIOn" object:nil];
// setup ensemble
self.cloudFileSystem = [[CDEICloudFileSystem alloc] initWithUbiquityContainerIdentifier:nil];
self.ensemble = [[CDEPersistentStoreEnsemble alloc] initWithEnsembleIdentifier:@"RecordStore"
persistentStoreURL:self.storeURL
managedObjectModelURL:[self modelURL]
cloudFileSystem:self.cloudFileSystem];
self.ensemble.delegate = self;
// Listen for local saves, and trigger merges
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(localSaveOccurred:)
name:CDEMonitoredManagedObjectContextDidSaveNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(cloudDataDidDownload:)
name:CDEICloudFileSystemDidDownloadFilesNotification
object:nil];
[self syncWithCompletion:NULL];
// configure a timer to trigger a merge every two minutes
if (!self.ensemblesSyncTimer) {
self.ensemblesSyncTimer = [NSTimer scheduledTimerWithTimeInterval:120.0
target:self
selector:@selector(performScheduledSync:)
userInfo:nil
repeats:YES];
}
}
- (void)performScheduledSync:(NSTimer*)aTimer {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
[self syncWithCompletion:NULL];
}
- (void)syncWithCompletion:(void(^)(void))completion {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
// set the sync UI on
[[NSNotificationCenter defaultCenter] postNotificationName:@"setSyncUIOn" object:nil];
// this checks to make sure there is an ensemble, because this method
// can be called without knowing whether ensembles is enabled or not
if (self.ensemble) {
if (coreDataDebug==1) { NSLog(@"there is an ensemble, going to leech or merge"); }
if (!self.ensemble.isLeeched) {
if (coreDataDebug==1) { NSLog(@"leeching"); }
[self.ensemble leechPersistentStoreWithCompletion:^(NSError *error) {
if (error) NSLog(@"Error in leech: %@", [error localizedDescription]);
// set the last synced date
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.timeStyle = NSDateFormatterMediumStyle;
dateFormatter.dateStyle = NSDateFormatterMediumStyle;
[dateFormatter setLocale:[NSLocale currentLocale]];
[[NSUserDefaults standardUserDefaults] setObject:[dateFormatter stringFromDate:[NSDate date]]
forKey:@"iCloudLastSyncDate"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"setSyncUIOff" object:nil];
object:nil];
if (completion) {completion();}
}];
}
else {
if (coreDataDebug==1) { NSLog(@"merging"); }
[self.ensemble mergeWithCompletion:^(NSError *error) {
if (error) NSLog(@"Error in merge: %@", [error localizedDescription]);
// set the last synced date
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.timeStyle = NSDateFormatterMediumStyle;
dateFormatter.dateStyle = NSDateFormatterMediumStyle;
[dateFormatter setLocale:[NSLocale currentLocale]];
[[NSUserDefaults standardUserDefaults] setObject:[dateFormatter stringFromDate:[NSDate date]]
forKey:@"iCloudLastSyncDate"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"setSyncUIOff" object:nil];
[[NSNotificationCenter defaultCenter] postNotificationName:@"recordCollectionNeedsRefresh"
object:nil];
if (completion) {completion();}
}];
}
}
}
- (void)localSaveOccurred:(NSNotification *)notif {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
[self syncWithCompletion:NULL];
}
- (void)cloudDataDidDownload:(NSNotification *)notif {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
[self syncWithCompletion:NULL];
}
- (void)persistentStoreEnsemble:(CDEPersistentStoreEnsemble *)ensemble didSaveMergeChangesWithNotification:(NSNotification *)notification {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
[_context performBlockAndWait:^{
[_context mergeChangesFromContextDidSaveNotification:notification];
}];
}
- (NSArray *)persistentStoreEnsemble:(CDEPersistentStoreEnsemble *)ensemble globalIdentifiersForManagedObjects:(NSArray *)objects {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
return [objects valueForKeyPath:@"uniqueIdentifier"];
}
- (void)removeEnsembles {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
[self disconnectFromSyncServiceWithCompletion:NULL];
}
- (void)disconnectFromSyncServiceWithCompletion:(CDECodeBlock)completion {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
[self.ensemble deleechPersistentStoreWithCompletion:^(NSError *error) {
self.ensemble.delegate = nil;
[self.ensemble dismantle];
self.ensemble = nil;
[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"iCloudLastSyncDate"];
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"iCloudSyncingEnabled"];
[self.ensemblesSyncTimer invalidate];
self.ensemblesSyncTimer = nil;
if (completion) completion();
}];
}
- (void)persistentStoreEnsemble:(CDEPersistentStoreEnsemble *)ensemble didDeleechWithError:(NSError *)error {
if (ensemblesDataDebug==1) { printf("Running %s\n", [NSStringFromSelector(_cmd) UTF8String]); }
NSLog(@"Store did deleech with error: %@", error);
}
我出错的任何想法?
[编辑,因为我的评论太长了]
首先,如果我进行本地保存并且云中有变化(假设它们已经传播 - 有没有办法知道?我已经等了很长时间试图排除它),didSaveMergeChangesWithNotification
不会被调用,也不会当我触发手动同步时会调用它。只有在我对本地模型进行更改然后保存上下文时才会调用它。我不太清楚离开我的地方。其次,检查获取控制器,云中的变化确实没有被拉下来。我已经打开CDELoggingLevelVerbose
继续调查,但我知道我做的事情根本就是错误,我必须要失踪。
此外,这是一个重大的变化 - 我刚刚从Ensembles Github中的旧问题中意识到,在模拟器中触发iCloud同步实际上是有效的!不幸的是,我正在模拟器中进行所有测试,因为我没有任何设备(我在测试过程中烧了我的iPhone太多iCloud登录)。这可能吗?我是否可以确信这实际上是正常工作,但是模拟器中有些东西实际上并没有让iCloud同步触发器?
我不清楚为什么它不起作用,但有些事情你可以尝试找出。
首先,尝试从日志中找出当您进行本地保存而不仅仅是合并(通过按下同步按钮)时的不同之处。在两种情况下都会触发didSaveMergeChangesWithNotification:
委托方法吗?假设云中有变化,它应该。
它也值得检查获取结果控制器。更改可能会进入存储,但获取控制器不会接收它们。一种检查方法是调用performFetch
并在每次合并结束时重新加载UI,以测试是否可能出现问题。
另一种查看Ensembles是否实际获取和合并数据的方法是打开详细日志记录。使用函数CDESetCurrentLogLevel
,并传入CDELoggingLevelVerbose
。这将打印出有关框架正在做什么的大量信息,并应提供线索。