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Learning iOS Development: A Hands-on Guide to the Fundamentals of iOS Programming by Erica Sadun, Rod Strougo, Maurice Sharp

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Camera

Most applications can assume there will be at least one camera. In most cases, there will be front- and back-facing cameras, though it is still wise to check at runtime. Although some very early devices had no camera (earlier iPod touches or the first-generation iPad), those devices make up a very small percentage of the market, and none of them run iOS 7. There are also devices with just a back-facing or a front-facing camera. The 16GB fifth-generation iPod touch is an example of the latter.

The cameras are useful. You can have the camera take shots and then send them to Flickr or Twitter. You can use the camera to grab images for direct manipulation, augmented reality, and so forth. The iOS SDK provides a built-in image picker controller ...

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