Passing object data with UIButton press

Question

I've created a custom UIView class FormDropdown, which contains a question & button in the nib. In the class is also an NSArray property which is supposed to store the various options for the button.

So a button can be placed by doing this, in for instance a viewDidLoad method:

FormDropdown *dropdown = [FormDropdown dropdownWithQuestion:@"This is an example question" andLabel:@"Select one" andOptions:[NSArray arrayWithObjects:@"One", @"Two", @"Three", nil]];
[self.view addSubview:dropdown];

Obviously, I'd like the button to, when tapped, bring up a UIPickerView with the options showing. But I'm stuck on how to send the options to any method. I know I can attach an action to the button like so:

[dropdown.dropdownButton addTarget:self action:@selector(dropdownPressed:) forControlEvents:UIControlEventTouchUpInside];

..but I can't see how I would pass the options from the dropdown.options array to the method?

Answer 1

I believe that you can do this by adding an "associative reference" from the UIButton to your object data.

http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocAssociativeReferences.html