Rapid, Interactive Prototyping With Xcode Playgrounds

Since their introduction in Xcode 6 alongside Swift, to their current iteration in Xcode 7.3.1, playgrounds have come a long way. With new features and better stability, they are evolving into a viable tool for rapid prototyping or quickly hacking together a proof of concept.

As a developer, sometimes you have a flash of inspiration in the form of an interesting idea for an app and you want to quickly code up a prototype that represents the bare essence of your idea. Or you just want to verify your understanding of how some piece of UIKit code will behave. If you are like me, you would rather avoid the hassle and mental overhead of creating an Xcode project and having to deal with a myriad of factors, such as device types and resolutions, and build settings. These decisions can be deferred until after you have made up your mind that the core idea is worth pursuing.

In this tutorial, we create a card-based memory game all within the confines of a playground. It is a common, well-known game, so no credit for originality there. The game consists of eight pairs of identical cards (so a total of 16 cards) placed face down in a 4x4 grid.

The player needs to flip two cards whose faces are briefly revealed and then quickly turned back over. The objective of the game is for the player to try and remember the positions of the cards and uncover identical pairs, which are then removed from the game. The game is over when the grid is cleared.

The game is touch-based and incorporates simple view animations. You learn how you can make modifications to your app and see the result of your changes live.

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​Prototyping, xCode Playgrounds