Question

Why does this loop freeze the GUI? How can I solve this?

 -(void)freeze {

      for(int i=0; i<10000; i++) {

          NSLog(@"write!");
      }
 }

If I call this loop with IBAction (button), button and all app freeze on pressing it. After the loop is done, everything works fine again. What should I do?

Answer 1

Change method to

-(void)freeze:(id)sender {
    for(int i=0; i<10000; i++) { 
        NSLog(@"write!");
    }
}

Now call it like this:

[self performSelectorInBackground:@selector(freeze:) withObject:nil];