（CKError代碼6）在CKContainer requestApplicationPermission

我試圖讀取使用CloudKit從他們的iCloud帳戶的用戶名，如下（CKError代碼6）在CKContainer requestApplicationPermission

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); 
         }]; 
        } 
       }]; 
      } 
     }]; 
    } 
}];

但每次requestApplicationPermission服務不可用錯誤失敗，服務不可用錯誤和狀態是CKApplicationPermissionStatusCouldNotComplete。我不知道我在這裏做錯了什麼。我用多個設備和帳戶嘗試過，但結果仍然相同。我試過在一些地方建議禁用和啓用CloudKit功能，但沒有運氣。是否有任何信息需要配置我缺少的信息。下面是我的iCloud功能的外觀

來源

2017-04-17 execv

您是否在您的設備iCloud設置中啓用了iCloud Drive？ FYI'fetchUserRecordIDWithCompletionHandler'不會給你一個用戶名，只是一個不透明的標識符 – Paulw11

@ Paulw11：我有用戶登錄到iCloud和iCloud Drive啓用。曾見過關於SO的建議。另外，從'fetchUserRecordIDWithCompletionHandler'獲取標識符後，我期待'discoverUserIdentityWithUserRecordID'的用戶名。 – execv

那麼事實證明，我需要調用requestApplicationPermission之前調用statusForApplicationPermission:。這真是令人困惑，因爲我沒有檢查權限狀態，權限請求失敗。這也與Service UnAvailable錯誤。下面是可用的代碼（不是很優雅）：

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); 
           }]; 
          } 
         }]; 
        } 
       }]; 
      } 
     }]; 
    } 
}];

來源

2017-04-19 11:44:54 execv

（CKError代碼6）在CKContainer requestApplicationPermission

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