Question

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Understanding when to call retain on an object?

I have a hard time to understand when I have to retain an object? Is there a general rule?

For example:

- (IBAction)buttonPressed:(UIButton *)button{

    // some code

    NSString *buttonText = button.titleLabel.text;
    //retain needed or not ?
    [buttonText retain];
    double result = [someObject someMethod:buttonText];

    // some more code
}

Answer 1

- (IBAction)buttonPressed:(UIButton *)button{

// some code

NSString *buttonText = [button.titleLabel.text retain];
//retain needed or not ?
// if you think your code can release the button object at this point, so you have to retain it.
// like : 
//[button release];

// its safer to retain your object so there wont be any problem. And dont forget to release

//[buttonText retain];


double result = [someObject someMethod:buttonText];

// release when you done with it.
[buttonText release];

// some more code
}