如何在iOS登录期间请求Facebook publish_actions权限

Question

To request facebook publish_actions permission during login in android I do

loginButton = (LoginButton) view.findViewById(R.id.login_button);
loginButton.setPublishPermissions(“publish_actions”);
loginButton.setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
    @Override
    public void onUserInfoFetched(GraphUser user) {
        FacebookOptInFragment.this.user = user;
        updateUI();
    }
});

That's all I need to do and I am done. User will first login and then get prompted to grant publishing permission. How do I do the exact same thing in iOS?

Note that I just now downloaded the Facebook SDK, which means I have the latest and greatest (in case that is relevant).

Answer 1

Some documentation first

Requesting publishing permissions with publish_actions during login creates a second step in the login UI. So you should request minimum read permissions during login then request any additional or publish permissions when someone actually needs them. To optimize your permission requests, see Optimizing Permissions.

So If all you need is to authorize your iOS app and grant publish_actions permission and if you really want integrate with iOS Facebook account, you have to ask for reading permission before you ask for the publishing permission. See the Request at Login portion of the page link above for getting read permissions.

Then you can request additional permissions for publish_actions like

// Request publish_actions
[FBSession.activeSession requestNewPublishPermissions:[NSArray arrayWithObject:@"publish_actions"]
                                      defaultAudience:FBSessionDefaultAudienceFriends
                                    completionHandler:^(FBSession *session, NSError *error) {
                                      __block NSString *alertText;
                                      __block NSString *alertTitle;
                                      if (!error) {
                                        if ([FBSession.activeSession.permissions 
                                             indexOfObject:@"publish_actions"] == NSNotFound){
                                          // Permission not granted, tell the user we will not publish
                                          alertTitle = @"Permission not granted";
                                          alertText = @"Your action will not be published to Facebook.";
                                          [[[UIAlertView alloc] initWithTitle:alertTitle
                                                          message:alertText
                                                         delegate:self
                                                cancelButtonTitle:@"OK!"
                                                otherButtonTitles:nil] show];
                                        } else {
                                          // Permission granted, publish the OG story
                                          [self publishStory];
                                        }

                                      } else {
                                        // There was an error, handle it
                                        // See https://developers.facebook.com/docs/ios/errors/
                                      }
                                    }];

Check this portion of the docs for permission management as well