DAAnisotropicImage is an anisotropic UIImage generator. Specifically, for a metallic slider knob.
It was built to be an imitation of the volume slider thumb image in Apple's iOS 6.0 Music app.
View the included example project for a demonstration. It also demonstrates the CPU usage.
On June 12, 2012, Gizmodo wrote an article about an overlooked feature in the iOS 6.0 beta: a skeuomorphic metallic slider in the Music app.
You can see a YouTube video of the feature here.
The change was criticized by some as a waste of resources and developer time. This project is a demonstration of how quickly the feature can be replicated, and how (relatively) CPU-light it is. Ultimately, this feature uses between 10% and 20% of the CPU. Compare that to simply sliding a UISlider at about half that amount. Note that this usage is only relative to the CPU allocated to the app. Play music in the background and the CPU usage will remain constant.
To use DAAnisotropicImage:
1 - Copy over the DAAnisotropicImage folder (and it's subfolder) to your project folder.
2 - Make sure that your project includes the CoreMotion.framework.
3 - Call startAnisotropicUpdatesWithHandler: appropriately.
DAAnisotropicImage was made with ARC enabled by default.
If you use/enjoy DAAnisotropicImage, let me know!
Copyright (c) 2012 Daniel Amitay (http://www.amitay.us)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.