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    <p>When you're adding target to control you can pass 3 types of selectors for action - </p> <pre><code>- (void)action - (void)action:(id)sender - (void)action:(id)sender withEvent:(UIEvent*)event </code></pre> <p>Names don't matter, it's number of parameter which is important. If control sends it's target a message with 2 params then first parameter will be control itself (instance of <code>UIButton</code> in your case), second one - instance of <code>UIEvent</code>. But you expects instance of <code>NSSet</code> as first parameter and send it a message <code>anyObject</code> which <code>UIButton</code> doesn't understand. This is the cause of crash.</p> <p>Why are you trying to send event from UI control to touch handling method <code>touchesMoved:withEvent:</code> in the first place? It will probably do something different from what you meant.</p> <p><strong>UPDATE:</strong></p> <pre><code>- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent *)event { UITouch *t = [touches anyObject]; CGPoint touchLocation = [t locationInView:self.view]; NSLog(@"%@", NSStringFromCGPoint(touchLocation)); } - (IBAction)buttongDragged:(id)button withEvent:(UIEvent*)event { NSSet *touches = [event touchesForView:button]; [self touchesMoved:touches withEvent:event]; } </code></pre> <p>Notice that since <code>touchesMoved:withEvent:</code> is a <code>UIResponder</code>'s method and controller's view <em>is</em> <code>UIResponder</code> this method will be also called on touch events for this view.</p>
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    1. COBecause I want the user to be able to drag the button elsewhere. I've edited more code in above.
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    2. COI see. I don't know if it's the best way to implement such behavior but if you absolutely need this you can get touches from event - `NSSet *touches = [event touchesForView:sender]`
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    3. COWhere would i put that code?
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