iOS Game Development

16 2. The Basics—How Does It All Work?

memory), we can play it safe and check again in the init method whether the reference

*

in fact exists:

if (self) {

//everything is OK

} else {

//error: self = nil

}

Here, nil means that the object is not present and therefore has the truth value

false (note that nil is not the same as NULL and thus can be used as a valid parameter).

e return value of self (= our object reference) is id; an id is a typeless object—a wild

card for objects, so to speak. Since we are creating the object with

MyObject *myObject = [[MyObject alloc] init];

we shall make a typed object of type MyObject out of the typeless id object ...