还是需要一个答案。 FBSession打开后调用popToRootViewController

Question

我仍然需要回答

我有视图控制器添加了facebook登录按钮。我上课：FacebookAuth方法：

- (void) performAuth {

    [FBSession openActiveSessionWithReadPermissions:nil
                                       allowLoginUI:YES
                                  completionHandler:
     ^(FBSession *session,
       FBSessionState state, NSError *error) {
         [self fbSessionStateChanged:session state:state error:error];
     }];

}

在我的Facebook视图控制器中，我有IBAction：

- (IBAction)performFBLogin:(id)sender {
    FacebookAuth *fbAuth = [[FacebookAuth alloc] init];
    [fbAuth performAuth];
    [self.navigationController popToRootViewControllerAnimated:YES];
}

问题是：如何在[self.navigationController popToRootViewControllerAnimated:YES];执行后致电performAuth。 根据官方指南，AppDelegate中有一个回调：

// During the Facebook login flow, your app passes control to the Facebook iOS app or Facebook in a mobile browser.
// After authentication, your app will be called back with the session information.
- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation
{
  return [FBAppCall handleOpenURL:url sourceApplication:sourceApplication];
} 

提前致谢。

Answer 1

我不确定，但你有没有尝试过这种方式，

- (void) performAuth {

    [FBSession openActiveSessionWithReadPermissions:nil
                                       allowLoginUI:YES
                                  completionHandler:
     ^(FBSession *session,
       FBSessionState state, NSError *error) {
         [self fbSessionStateChanged:session state:state error:error];
        [self.navigationController popToRootViewControllerAnimated:YES];
     }];

}