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我创建了一个 UIDocument 来包装一个自定义对象。UIDocument 已成功保存到 iCloud，并且每次运行应用程序时都成功加载了每个 UIDocument。但是，当我尝试在新设备（iPhone 5）上运行该应用程序时，它不会从 iCloud 加载任何 UIDocument，但我可以在“设置”下检查 iCloud 并查看保存在我的应用程序下的文件。有没有人有一些步骤来检查为什么一个设备（iPhone 4）可以加载而另一个（iPhone 5）不能？我也无法从 iPhone 5 设备创建新的 UIDocument。

编辑

- (void)loadObjects
{
    if (!self.objects)
    {
        self.objects = [[NSMutableArray alloc] init];
    }

    NSURL *baseURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];

    if (baseURL)
    {
        self.query = [[NSMetadataQuery alloc] init];
        [self.query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];

        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like 'Object_*'", NSMetadataItemFSNameKey];
        [self.query setPredicate:predicate];

        NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
        [nc addObserver:self selector:@selector(queryDidFinish:) name:NSMetadataQueryDidFinishGatheringNotification object:self.query];
        [nc addObserver:self selector:@selector(queryDidUpdate:) name:NSMetadataQueryDidUpdateNotification object:self.query];

        [self.query startQuery];
    }
}

- (void)queryDidFinish:(NSNotification *)notification
{
    [self processQueryResults:notification.object];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSMetadataQueryDidFinishGatheringNotification object:notification.object];

    self.query = nil;
}

- (void)queryDidUpdate:(NSNotification *)notification
{
    [self processQueryResults:notification.object];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSMetadataQueryDidFinishGatheringNotification object:notification.object];

    self.query = nil;
}

- (void)processQueryResults:(NSMetadataQuery *)query
{
    [query disableUpdates];

    [query stopQuery];

    [self.objects removeAllObjects];

    [query.results enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop)
    {
        NSURL *documentURL = [(NSMetadataItem *)obj valueForAttribute:NSMetadataItemURLKey];

        ObjectDocument *document = [[ObjectDocument alloc] initWithFileURL:documentURL];

        [document openWithCompletionHandler:^(BOOL success) {
            if (success) {
                [self.objects addObject:document];

                [self sortObjects];

                [self.tableView reloadData];
            }
        }];
    }];

    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)save:(Object *)object
{
    NSURL *baseURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];

    if (baseURL)
    {
        NSURL *documentsURL = [baseURL URLByAppendingPathComponent:@"Documents"];

        NSURL *documentURL = [documentsURL URLByAppendingPathComponent:[NSString stringWithFormat:@"Object_%f", [object.date timeIntervalSince1970]]];

        TVBFlightDocument *document = [[ObjectDocument alloc] initWithFileURL:documentURL];
        document.object = object;

        [document saveToURL:documentURL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) {
            if (success) {
                NSLog(@"Save succeeded.");

                [_objects addObject:document];

                [self sortObjects];
            } else {
                NSLog(@"Save failed.");
            }
        }];
    }
}

iPhone 5 上的应用程序不会加载存储在 iCloud 中的对象，但 iPhone 4 会从 iCloud 文档中加载对象。

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