1. Getting Xcode
If you want to use Xcode, you must install it. Developer tools were bundled into OS X in the early days, but now you must download it, drag the Xcode application into your /Applications folder, and start it up.
Before You Begin
Before you do anything, be sure you can use Xcode 6. There are two considerations.
Developing for Earlier Operating Systems
When Apple brings out a new version of Xcode, it includes software development kits (SDKs) for the latest version of iOS (8) and the versions of OS X that it can run on (Mavericks 10.9 and Yosemite 10.10). In theory, that isn’t much of a constraint: You can still target earlier OSes; the SDK does the right thing to adapt itself to the earlier versions.
However, there are some ...
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