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iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK by Joe Keeley, Kyle Richter

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Filter Categories and Filters

Core Image filters are organized into categories internally. A filter can belong to more than one category; for example, a color effect filter like Sepia Tone belongs to six categories, including CICategoryColorEffect, CICategoryVideo, CICategoryInterlaced, CICategoryNonSquarePixels, CICategoryStillImage, and CICategoryBuiltIn. These categories are useful to the developer to determine what Core Image filters are available for a desired task, and can be used as in the sample app to allow the user to browse and select available filters.

In the sample app, when a user taps the Add Filter button, a popover segue is initiated. This segue will initialize a UIPopoverController, a UINavigationController, and an instance ...

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