When team of developers work together with mid or large size codebase I highly recommend to use static code analyzers like SwiftLint. It will help your team to spend less time on code styles debates while code reviews, early stage bugs detection, deliver cleaner and more readable code.
You should start with picking rules that SwiftLint should warn you about and configuring it on your CI.
You should be aware that code analysis takes time so be wise not to run it constantly on devs' computers.