objective-c - PFFacebookUtils logInInBackgroundWithReadPermissions 块未调用

Question

PFFacebookUtils logInInBackgroundWithReadPermissions 块在更新 xcode7 并将 SDK 解析为 1.8.5 和 Facebook SDK 4.6 后未调用：https ://developers.facebook.com/docs/ios/ios9

NSArray *permissions = [NSArray arrayWithObjects:@"email",@"user_friends", nil];
[PFFacebookUtils logInInBackgroundWithReadPermissions:permissions block:^(PFUser *user, NSError *error)
{
 if (!user) // The user cancelled the Facebook login
 {
     NSLog(@"Uh oh. The user cancelled the Facebook login.");
 }
 else if (user.isNew) // New user (not stored on DB) - User signed up and logged in through Facebook
 {
     [self handleNewUser];
 }
 else if (user) // the user is exist at DB
 {
   // the user is exist at DB  
 }
 else if (error)
 {
    // showAlertOfSomethingWentWrong
 }
}];

我能做些什么来解决这个问题？