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copied!<p>You need to use <code>delegation</code> - like when you supply the data for a <code>UITableView</code> it doesn't know exactly what your class is, just that it implements a specified <code>@protocol</code>.</p> <p>Define your own protocol which describes the callback offered (this goes in ColorClass.h):</p> <pre><code>@protocol ColorClassDelegate < NSObject > - (void)colorPicker:(ColorClass *)colorPicker didPickColor:(UIColor *)color; @end </code></pre> <p>Then in your <code>ColorClass</code> (again, the .h file) you have a property for the delegate:</p> <pre><code>@property (weak, nonatomic) id < ColorClassDelegate > delegate; </code></pre> <p>When the colour has been chosen (button pressed):</p> <pre><code>- (void) buttonPressed : (id) sender { // delegate [self.delegate colorPicker:self didPickColor: ## get the colour here ## ]; // persistent store [myStorage setButtonColor:[sender tag]]; } </code></pre> <p>And any class that uses the colour picker implements the <code>ColorClassDelegate</code> protocol</p> <pre><code>#import "ColorClass.h" @interface ClassA < ColorClassDelegate > </code></pre> <p>And sets itself as the colour pickers delegate. Then it implements:</p> <pre><code>- (void)colorPicker:(ColorClass *)colorPicker didPickColor:(UIColor *)color { // do something with the colour } </code></pre> <p>Your original code was passing the button tag to represent the colour. You could do that instead of passing the colour in the delegate method.</p>

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