Summary

In this chapter, you completed the implementation of the Photo Filter screen. You imported FilterData.plist, a .plist file containing the filters you want to use, created the FilterItem class to store filter data, and created the FilterManager data manager class to read the .plist file and populate an array of FilterItem instances. Next, you created a protocol, ImageFiltering, with a method to apply filters to images. Then, you created the FilterCell and PhotoFilterViewController classes in order to manage the collection view cells and the Photo Filter screen. After that you made the PhotoFilterViewController class adopt the UIImagePickerDelegate protocol, and added methods so that you can use photos from the camera or photo library in your app. Finally, you added code to PhotoFilterViewController to apply a selected filter to a picture.

You are now able to write your own apps that import photos from your camera or photo library and apply filters to them.

Note that the...