服务不可用错误(CKError代码6)在CKContainer requestApplicationPermission中

Question

我正试图使用下面的iCloud从他们的CloudKit帐户中读取用户的名字

CKContainer *container = [CKContainer defaultContainer];
[container accountStatusWithCompletionHandler:^(CKAccountStatus accountStatus, NSError * _Nullable error) {
    if (accountStatus == CKAccountStatusAvailable) {
        [container requestApplicationPermission:CKApplicationPermissionUserDiscoverability completionHandler:^(CKApplicationPermissionStatus applicationPermissionStatus, NSError * _Nullable error) {
            if (applicationPermissionStatus == CKApplicationPermissionStatusGranted) {
                [container fetchUserRecordIDWithCompletionHandler:^(CKRecordID * _Nullable recordID, NSError * _Nullable error) {
                    if (!error && recordID) {
                        [container discoverUserIdentityWithUserRecordID:recordID completionHandler:^(CKUserIdentity * _Nullable userInfo, NSError * _Nullable error) {
                            NSLog(@"UserInfo: %@  Error: %@", userInfo, error);
                        }];
                    }
                }];
            }
        }];
    }
}];

但是，每次requestApplicationPermission失败时，服务不可用，错误，状态为CKApplicationPermissionStatusCouldNotComplete。我不知道我在这里做错了什么。我尝试了多个设备和帐户，但结果仍然是一样的。我尝试过禁用和启用CloudKit的功能，就像在某些地方建议的那样，但没有成功。是否有任何信息，我需要配置，我正在丢失。下面是我的iCloud功能

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Answer 1

实际上，在调用statusForApplicationPermission:之前，我需要调用requestApplicationPermission。令人费解的是，仅仅因为我没有检查权限状态，权限请求就失败了。这也与Service UnAvailable错误有关。下面是工作的代码(不太优雅)：

CKContainer *container = [CKContainer defaultContainer];
[container accountStatusWithCompletionHandler:^(CKAccountStatus accountStatus, NSError * _Nullable error) {
    if (accountStatus == CKAccountStatusAvailable) {
        [container statusForApplicationPermission:CKApplicationPermissionUserDiscoverability completionHandler:^(CKApplicationPermissionStatus applicationPermissionStatus, NSError * _Nullable error) {
            if (applicationPermissionStatus==CKApplicationPermissionStatusInitialState || applicationPermissionStatus==CKApplicationPermissionStatusGranted) {
                [container requestApplicationPermission:CKApplicationPermissionUserDiscoverability completionHandler:^(CKApplicationPermissionStatus applicationPermissionStatus, NSError * _Nullable error) {
                    if (applicationPermissionStatus == CKApplicationPermissionStatusGranted) {
                        [container fetchUserRecordIDWithCompletionHandler:^(CKRecordID * _Nullable recordID, NSError * _Nullable error) {
                            if (!error && recordID) {
                                [container discoverUserIdentityWithUserRecordID:recordID completionHandler:^(CKUserIdentity * _Nullable userInfo, NSError * _Nullable error) {
                                    NSLog(@"UserInfo: %@  Error: %@", userInfo, error);
                                }];
                            }
                        }];
                    }
                }];
            }
        }];
    }
}];