Building Document Based Apps – WWDC15

WWDC15UIDocument is a robust way to model user-generated content in your app. See how to easily integrate your app’s documents with iCloud, file extensions, and document browsers. Learn how to build a document-based app from the ground up.

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Sample Code:
ShapeEdit: Building a Simple iCloud Document App

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WWDC 2015 > App Frameworks > Building Document Based Apps
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