Since then I received a submission from Daniel Amitay who has created a similar category the main difference being that Daniel’s code outputs a UIImage that you can attach to your controls. The effect is also a little more realistic as it is not quite as jumpy as the previous example.
As Daniel stated in his submission known as DAAntriscopicImage:
Most importantly, it outputs a UIImage object so that you can actually add the effect to a UISlider. The example demonstrates a functioning UISlider with the effect.
It is also a more accurate recreation of the shine and movement. The “Adaptive-Metal-Knob” jumps backwards and forwards over certain axes, whereas DAAnisotropicImage smoothly moves through all axes.
Here’s an example image showing the metallic effect in the example on a larger image and in the slider:
And here’s a quick video showing the customized slider control knob in action:
You can download this control over on Github.
Looks like the metallic effect is going to be appearing in a lot more apps soon.