Question

I don’t understand this:

+ (void)beginAnimations:(NSString *)animationID context:(void *)context

(void *) —-> what kind of data can I provide here?

Answer 1

Use it to pass a pointer to the object that you’re animating. When you call setAnimationDidStopSelector you have to give it a method selector to call. That method’s signature has to be of the form:

- (void)animationDidStop:(NSString *)animationID 
                finished:(NSNumber *)finished 
                 context:(void *)context

The context value you defined in beginAnimations is passed untouched to this method. It’s just a (void *) which is shorthand for “a pointer to anything you want it to be.” An object, an integer, a struct. Whatever.

Instead of “context” think of it as “userData.”