Question

- (id) init

{
    [super initWithNibName : nil
                    bundle : nil];  
    UITabBarItem *tbi = [self tabBarItem];  
    [tbi setTitle : @"Hypnosis"];   
    UIImage *i = [UIImage imageNamed : @"Hypno.png"];   
    [tbi setImage : i];         
    return self;        
}

Consider the above sample code, my questions are :

1

There is a “setImage” method call, but I cannot find the corresponding “Image” property
in documentation.

2

UIImage *i is being assigned by the statement “[tbi setImage : i]” to the Image property.
Does “*i” being retained by tbi? If so, should we release “i” immediately after the assignment ?

Hope that some knowledgeable person would help me to find the answers.

Answer 1

there doesn’t need to be an image property declared for a class to have a setImage: method–a property can be implied to exist by the existence of setters/getters. i will be retained by the TabBarItem–that’s the responsibility of the setter API. This is standard behavior. Finally, do not release i after calling setImage:. You do not have an owning reference to i since it was returned from a factory method, not an [ [ alloc ] init ] invocation. HTH