Question

I’m building calculator on the iphone for learning purposes.

I have a situation where I have multiple buttons that are Operations(+,-,/) and multiple buttons that are Operands e.g. 1,2,3 etc.

So all the the Operations connect to a operationPressed method in my viewController.

Is there a way in the UI builder to identify each UIButton other than using the Text for the button in the view?

What would be best practice?

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Update

What about the Identity Label that I can set in the UI builder. can I reference that?

The reason I ask is I want to identify the button but say ‘/’ but the text on the button would be ‘÷’ so that is why i need some other string identifier which ultimately can be pass as an argument to my model.
http://cl.ly/3H1j032f1M1d3A2Y3501

Answer 1

The way this is typically handled is to set each button’s tag property to some unique integer value, and write action methods that take a sender argument, for example:

- (void)operationPressed:(id)sender
{
    // cast the argument to a more specific type
    UIButton *button = (UIButton *) sender;

    // get the view's tag
    NSInteger tag = [button tag];

    // Do whatever it was you were going to do...
}

EDIT

Here’s the declaration of the tag property from UIView.h:

@property(nonatomic) NSInteger tag; // default is 0