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You don't have to write all the code in your project yourself. There is an increasing number of third party open source implementations that let you avoid re-inventing the wheel.
There are also a few ways of integrating this code into your project, whether using CocoaPods, Git, Xcode Workspaces, prebuilt libraries, or just copying and pasting the code into your project structure.
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Using Third Party Code In Your Project
Abizer Nasir is a freelance iOS / OS X developer who has been working full-time in Swift for over a year. He has spoken on a variety of subjects related to Objective-C and Swift development at iOSCon, NSLondon, Swift London, Swift Summit and AltConf.
He organises NSCoder Night London.