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copied!<p>You should add a handler for the 'drag enter' event for each button - I'm not sure that you can do this in interface builder but here's how to do it in code.</p> <p>Put this in your viewDidLoad method :</p> <pre><code>[button1 addTarget:self action:@selector(buttonEntered:) forControlEvents:UIControlEventTouchDragEnter]; [button2 addTarget:self action:@selector(buttonEntered:) forControlEvents:UIControlEventTouchDragEnter]; [button3 addTarget:self action:@selector(buttonEntered:) forControlEvents:UIControlEventTouchDragEnter]; [button4 addTarget:self action:@selector(buttonEntered:) forControlEvents:UIControlEventTouchDragEnter]; [button5 addTarget:self action:@selector(buttonEntered:) forControlEvents:UIControlEventTouchDragEnter]; </code></pre> <p>and then </p> <pre><code>- (void)buttonEntered:(UIButton *)button { NSLog(@"Dragged into %@", button); } </code></pre> <p>Have a <a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/UIControl_Class/Reference/Reference.html#//apple_ref/c/tdef/UIControlEvents" rel="nofollow">look at this</a> for the different types of control events you can listen for.</p> <p>NB This example assumes that you have got this in your .h file :</p> <pre><code>@property (nonatomic, retain) IBOutlet UIButton *button1; @property (nonatomic, retain) IBOutlet UIButton *button2; @property (nonatomic, retain) IBOutlet UIButton *button3; @property (nonatomic, retain) IBOutlet UIButton *button4; @property (nonatomic, retain) IBOutlet UIButton *button5; </code></pre> <p>and connected them correctly in interface builder etc.</p>

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