ios - 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."

and

"Break on warnParseOperationOnMainThread() to debug."

I'm unable to locate the error within my code. Can someone please tell me what I'm doing wrong?

PFQuery *query = [PFQuery queryWithClassName:@"User"];
[query getObjectInBackgroundWithId:[[PFUser currentUser] objectId] block:^(PFObject *object, NSError *error) {

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

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

Answer 1

This is a gentle warning to the developers when they make the Parse calls that would block the main thread.

This is where you can see it all happen,, add a symbolic breakpoint on warnBlockingOperationOnMainThread only if you use a Parse API released from 2015+. Otherwise, put it on the warnParseOperationOnMainThread.

It'll break on that function while you are running your code, and will show you a stack trace which should help you to find the blocking function.

See the images below to have a better understanding.