Question

Why UIButton does not require to alloc and init call instead we use only
UIButton *myBtn = [UIButton buttonWithType:UIButtonTypeCustom];.

1. Does the above line automatically alloc s and init the uibutton??
2. Is it necessary to release myBtn?,since i’m not using alloc and init explicitly.

This may be a simple question but i don’t know the correct answer for this, does anybody can help? Any help is appreciated,thanks in advance.

Answer 1

There’s a set of rules that the method names follow – read this link 😉

Basically, names beginning with alloc, new, copy or mutableCopy require you to call release (or autorelease).

Any other methods that return an object will return autoreleased objects.

For example :

// You need to release these
NSString *myString = [[NSString alloc] init];
NSString *nextString = [myString copy];
UIbutton *button = [[UIButton alloc] initWithType:UIButtonTypeCustom];

// You don't need to release these
NSString *thirdString = [NSString stringWithString:@"Hello"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

Hope that helps!