Since Xcode 9.0 we’ve been able to create named colors directly inside asset catalogs, which means it’s possible to select a precise color once then use it uniformly across all code and storyboards.
To try this out, open your asset catalog, click the + button, then choose New Color Set from the menu that appears. Select the new color that got created – it will be a large white square – then press Alt+Cmd+4 to activate the attributes inspector so that you can customize it.
Named colors are comprised of two rather obvious parts: a name (e.g. “PayPal blue”) and a color, which you can specify as ranges from 0-1, ranges from 0-255, or hexadecimal.
Once a named color is in place you can use it code like this:
myView.backgroundColor = UIColor(named: "Chartreuse")
You can also use it inside storyboards by selecting it from the color dropdown menu – all your named colors will automatically be shown in their own section of the menu.
Available from iOS 11.0
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Build for watchOS
Take your existing Swift skills to Apple's tiniest platform – check out Hacking with watchOS!