Question

When an IBAction is called:

-(IBAction) onClick1: (id) sender;

What is passed in the sender? Since it’s hooked up through the IB, I’m not really sure. My question is how to get the text of the button to be the passed object (NSString most likely) so that I could call it inside the action implementation.

-(IBAction) onClick1: (id) sender {
  NSLog(@"User clicked %@", sender);
  // Do something here with the variable 'sender'
}

Answer 1

It’s actually:

-(IBAction) onClick1: (id) sender {
  NSLog(@"User clicked %@", sender);
  // Do something here with the variable 'sender'
}

sender is not a NSString, it’s of type id. It’s just the control that sent the event. So if your method is trigged on a button click, the UIButton object that was clicked will be sent. You can access all of the standard UIButton methods and properties programmatically.