Question

I’m going to write my own custom control that is very different from UIButton. It’s so much different that I decided to write it from scratch. So all I subclass is UIControl.

When my control is touched up inside, then I want to fire a message in means of target-action. The user of that class may instantiate it and then add some targets and actions for this event.

i.e. imagine I would call internally a method -fireTargetsForTouchUpEvent. How could I maintain this target-action-mechanism in my class? Do I have to add all targets and actions to my own array and then just call selectors (the actions) on the target objects in a for-loop? Or is there a more intelligent way to do it?

I imagine to provide some methods for adding targets and actions for some events like that touch up event (I raise that manually by calling a internal method when that happens). Any idea?

Answer 1

Since you’re planning to subclass UIControl, you can just use

- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents;

Using this, any class can register itself as a target for any events it wants to on your custom controller.