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Here’s a nice guide with example code showing how to modify a UISlider adding some custom effects from Wojtek Lukaszuk.

In the guide you’ll learn how to modify the tracking behavior of a slider, and add a neat spring animation following the drag of the users finger. The end result is a nice springy effect that responds neatly to the users touch.

Here’s an animation from the guide showing the Springy Slider effect:

You can find the guide over on Wojtek Lukaszuk’s blog.

You can find the example code for the Springy slider on Github here.