The Sample App
The sample app for this chapter is called MyNotes, which is a simple note editor. Notes are constructed using a custom subclass of UIDocument, and are synced between devices using iCloud. The sample app also uses the iCloud-based key-value store to keep track of which note has most recently been edited, and syncs that information between devices.
In a shipping app, support for iCloud would typically be optional, because not all users have or use iCloud accounts. The sample app assumes that iCloud is available for simplicity, and does not support “local only” usage without an iCloud account. The major difference is the URL where files are stored; for local-only storage, user-generated files should be in the Documents directory ...
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