“应用程序必须在安装时请求基本的读取权限”

Question

I am using the iOS Built in frameworks to connect. After asking for "publish_stream" permissions, FB returns an error:

Error Domain=com.apple.accounts Code=7 "The Facebook server could not fulfill this access request: The app must ask for a basic read permission at install time." UserInfo=0x145ad6a0 {NSLocalizedDescription=The Facebook server could not fulfill this access request: The app must ask for a basic read permission at install time.}

What is going on here? Showing two user permission popups is a less than ideal user experience.

Answer 1

The very first time, you must ask for read permissions. You cannot auth the user initially with any type of publish/write permissions. What you should do after that is, where it makes sense in your app, ask for publish_stream permission. Definitely do not do the initial permission and then immediately ask for the publish_stream permission.

See this note in https://developers.facebook.com/docs/tutorial/iossdk/upgrading-from-3.0-to-3.1/ , section "Asking for Read & Write Permissions Separately". Even though this applies to the Facebook SDK for iOS it is an extension of the same requirement in the built-in framework.

Answer 2

I would like to add that there is an additional caveat in the Facebook docs:

// if a user has *never* logged into your app, you MUST include one of
// "email", "user_location", or "user_birthday".  Other read 
// permissions can also be included here.

Failure to do this leads to the same error.

Answer 3

In the latest SDK (v3.5) you also need to pass @"basic_info" in the permissions array. It used to be implicit, but not anymore. If you don't, you'll get the "The app must ask for a basic read permission at install time" message

  [FBSession openActiveSessionWithReadPermissions:@[@"email", @"basic_info"]
                                 allowLoginUI:YES
                            completionHandler:^(FBSession *session, FBSessionState state, NSError *error) {
                              [self sessionStateChanged:session state:state error:error];
                            }];

From the method docs:

readPermissions - An array of strings representing the read permissions to request during the authentication flow. The basic_info permission must be explicitly requested at first login, and is no longer inferred, (subject to an active migration.) It is not allowed to pass publish permissions to this method.