Paris Buttfield-Addison

Paris Buttfield-Addison is co-founder of Secret Lab, a mobile development studio based in beautiful Hobart, Australia. Secret Lab builds award winning games and apps for mobile devices. Paris formerly worked as mobile product manager for Meebo (acquired by Google), has a PhD in Computing, and writes technical books for O’Reilly Media. He can be found on Twitter @parisba.

Parallax scrolling for iOS with Swift and Sprite Kit

Learn how to add this popular visual effect to your iOS project.

Up until the mid 1990s, the pinnacle of video game graphics was parallax scrolling: the use of multiple scrolling backgrounds, which created a sense of depth and perspective in the game. When you’re being a 2D game in Sprite Kit, you can create this effect by creating multiple sprites, and managing their position over time.

In this example, we’re creating a scene where there are four components, listed in order of proximity:

  • A dirt path
  • Some nearby hills
  • Some further distant hills
  • The sky

You can see the final scene below:

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Swift-like Swift code

A brief introduction to Swift optionals.

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Swift is becoming the language of choice for more and more developers on iOS and OS X. It’s fast, simple, clean, and has a number of features that simply aren’t available to Objective-C programmers.

While it isn’t a hard requirement to do so, several projects are being ported from Objective-C to Swift — especially those in their early stages — in order to take advantage of the speed, power, and safety of Swift. One of those projects isn’t actually a software project — it’s the upcoming Swift edition of iOS Games Programming Cookbook. When we began updating the book for Swift, the first thing that we had to do was to rewrite all of the book’s code in the new language. However, a straight re-write from one language into another isn’t enough. Swift behaves differently than Objective-C in very important ways, and that means that your ported Swift code needs to be aware of how Swift does things.

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Multipeer Connectivity on iOS 8 with Swift

Discover, connect, and transmit data between devices.

portable_handsetMultipeer Connectivity is a means of identifying and connecting services together, and allows for very easy passing back and forth of data with minimal setup. If you are thinking that this seems similar to Bonjour, you are correct; however, Bonjour is for service discovery, not connection or transmission. Multipeer Connectivity handles everything in one neat package.

Multipeer Connectivity is comprised of a few different components, but it works by having applications advertise their services asking if anyone is available to connect. The service browser listens for these advertisements and can request to create a connection between the devices. If the connection is accepted, a session is created with every one inside the session being represented by a peer object.

To demonstrate how this works, we’ll make a simple chat application using Swift, Apple’s new language.

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