A long-running Parse operation is being executed on the main thread

Question

I am getting the error:

\"A long-running Parse operation is being executed on the main thread. Break on warnParseOperationOnMainThread() to debug.\"

Answer 1

Maybe it is a bit late, but here you go. I think the problem come from the fact that you are trying to get to objects fetch at the same time:

[[PFUser currentUser] objectId];

and:

 [query getObjectInBackgroundWithId...];

It will be better to get the userId first, such as:

//First fetch and store the id in a string so you can reuse it whenever you want
NSString *userId = [PFUser currentUser].objectId; 

Second:

  // Do your second fetch here:          
  PFQuery *query = [PFQuery queryWithClassName:@"User"];        

 [query getObjectInBackgroundWithId:userId block:^(PFObject *object, NSError *error) {

 self.firstName = object[@"firstname"];
 self.lastName = object[@"lastname"];

 self.nameLabel.text = [[NSArray arrayWithObjects:self.firstName, self.lastName, nil]    componentsJoinedByString:@" "];
 }];

Et voila!