ios – URLForUbiquityContainerIdentifier总是返回nil

我尝试过几个不同来源的解决方案：

> URLForUbiquityContainerIdentifier alway return nil
> URLForUbiquityContainerIdentifier returns nil even if configured correctly
> https://devforums.apple.com/thread/229509？

似乎没有任何工作.我的设置：

权利和能力：

码：

dispatch_async(dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^(void) {
    NSURL *myContainer = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];

    // unarchive journal object from iCloud
    if (myContainer != nil) {
        NSString *filePath = [NSString stringWithFormat:@"%@/%@",myContainer.path,ARCHIVE_FILE_NAME];
        self.journal = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];

        // initialize journal from local storage if there's no iCloud archive
        if (self.journal == nil)
            [self initJournalFromLocalStorage];
        else
            [self.journal validateUserDefines];

        self.journal.cloudURL = myContainer;

        dispatch_async (dispatch_get_main_queue (),^(void) {
            // On the main thread,update UI and state as appropriate
        });
    }
});

我的Apple ID已启用iCloud进行开发和分发;我尝试过创建和下载新的配置文件.

我还尝试在.entitlements中将iCloud.$(CFBundleIdentifier)更改为$(TeamIdentifierPrefix)$(CFBundleIdentifier).

无论我做什么,URLForUbiquityContainerIdentifier总是返回nil.任何帮助表示赞赏！