Obj-C, Instance variable used while 'self' is not set to the result of '[(super or self) init…]'

Question

I know I asked a similar question to this not long ago, but I\'m still a little unsure about it. The same sort of thing happens in several places.

Instance variable

Answer 1

Generally, you're supposed to write:

self = [super init...];  // Potentially change "self"
if (self) {
    something = x;
    another = y;
}
return self;

This is because init may not return the original self value in some cases.