One of the most important parts of writing code is writing maintainable code. In a group setting especially, a style guide is very important. Lint tools help to enforce that (as well as checking for certain types of bugs). SwiftLint is a lint tool that is based on GitHub's Swift Style Guide.

Install it with Homebrew:

brew install swiftlint

There are 2 ways to use it, either A) run it from the shell, which will examine Swift code files in the current directory:

swiftlint

Or B) Add a Run Script Phase:

if which swiftlint >/dev/null; then
    swiftlint
else
    echo "warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint"
fi

As with all things Swift, it's a relatively new tool and it implements 31 rules as of writing.

There are more options such as using the autocorrect option and more, described in the README.

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