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    <p>If you are targeting iOS 4.0 or greater then you can use the <a href="http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/AnimatingViews/AnimatingViews.html#//apple_ref/doc/uid/TP40009503-CH6-SW1" rel="nofollow">new block based class methods</a> to start animatable changes to <a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/UIView_Class/UIView/UIView.html" rel="nofollow">view</a> objects. So from your touch event you can initiate an animatable change to properties on the view:</p> <pre><code>[UIView animateWithDuration:1.0 animations:^{ yourView.alpha = 0.0; // fade out yourView over 1 second }]; </code></pre> <p><strong>N.B.</strong> This could just as easily be a change to another property on the view, like its location. You can animate the following properties on the view this way:</p> <pre><code>@property frame @property bounds @property center @property transform @property alpha @property backgroundColor @property contentStretch </code></pre> <p>If you are targetting earlier versions of iOS you will need to use UIView <a href="http://developer.apple.com/library/ios/documentation/uikit/reference/UIView_Class/UIView/UIView.html#//apple_ref/occ/clm/UIView/beginAnimations%3acontext%3a" rel="nofollow">beginAnimations</a> and <a href="http://developer.apple.com/library/ios/documentation/uikit/reference/UIView_Class/UIView/UIView.html#//apple_ref/occ/clm/UIView/commitAnimations" rel="nofollow">commitAnimations</a> methods to create an animation block:</p> <pre><code>[UIView beginAnimations:nil context:context]; [UIView setAnimationDuration:1.0]; yourView.alpha = 0.0; [UIView commitAnimations]; </code></pre> <p>This stuff works really well and once you start using it, you will have to be careful you don't get addicted. ;)</p> <p><strong>Update for comment:</strong></p> <p>You can bind the position of the marble to the location of the touch event. Once you get the <a href="http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIResponder_Class/Reference/Reference.html#//apple_ref/occ/instm/UIResponder/touchesEnded%3awithEvent%3a" rel="nofollow">touchesEnded</a> event you can then animate the location of the marble using an animation block.</p>
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    1. POiPhone animation based on input values (touches) not time
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    1. COYes but the problem is I don't want to have anything to do with duration. Think of the marble. If I do nothing to it, it does nothing. If I push it slowly then it moves slowly, if fast then it moves fast. If I stop pushing it suddenly after moving it fast it should keep rolling a while until it slows and stops. Seems like the time approach doesn't allow this. I do have some beautiful smooth animation happening with CAKeyframeAnimation, but I can't control it other than to set it running and to set ease in/ease out.
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    2. COThere's still a problem. The position of the objects are not the position of the touch, they have to stay in a path. The stroke of the touch just imparts motion to the objects when the touches happen in the right view. The objects must follow a path. Also calculating the position and doing this the obvious way just isn't smooth enough especially when the position calculation gets expensive or on older iOS devices.
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    3. CO@adam-eberbach Ah! I see your point. It is the interpolation between touche events that is causing issues. I'll have a think about that. Definitely non-trivial :)
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