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The Complete Idiot's Guide® To iPad and iPhone App Development by Troy Brant

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Another App in the Books

Congrats! You have completely and successfully written iShockU, your third iPhone application. Although this app was written purely for educational purposes, it is worth noting that some of the most successful apps on the App Store are as simple and easy to use as this one.
If you feel motivated to keep working on the app (and who wouldn’t?), then for extra credit, try changing the background color of the label while the red button is pressed. Or try changing the background image of the entire view to a lightning bolt when the red button is pressed. You can use the lightning bolt image provided online at: http://troybrant.net/iphonebook/chapter4/lightning-bolt.png.
Now that you have been exposed to some Objective-C, ...

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