iPhone Objective-C foreach design

Question

I\'m trying to implement a design as follows:

Touch class : acts as an interface, several classes inherit from it:
MoveTouch class

Answer 1

You need to test for the class type:

for (Touch *t in touches) {
  if ([t isKindOfClass:[MoveTouch class]]) {
    MoveTouch *mt = (MoveTouch *)t;
    // do what you want with mt
  }
}