GLColor

📄 What it is

GLColor is a drop-in, ready to use, UIColor subclass and extension that can be used to generate device gamut-aware (sRGB or DCI-P3) UIColors or convert existing ones automatically.

As Apple Human Interface Guidelines reports its important to use wide color on compatible displays whenever possible to ensure the best color experience in your applications. Unfortunately the regular UIColor uses sRGB as the default color space, causing DCI-P3 compatible to render in sRBG mode all the time, instead of being able to show all the possible colors. To enable DCI-P3 rendering you must initialize a UIColor using a new alternative init signature provided by Apple:

UIColor(displayP3Red:, green:, blue:, alpha:)

But this can lead to repetitive error-prone code and/or if statements since you always have to specify which color gamut to use for every single UIColor in your code, based on device capabilities.

🛠 How to use

With GLColor you have two simple choices:

1. Use it like a UIColor replacement to initialize a gamut-aware color with the provided signature:

   init(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat, gamut: UIDisplayGamut)
   

2. Use the provided extension with your already existing UIColors:

   let color: UIColor = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0)
   color.matching(colorGamut: traitCollection.displayGamut)
   

Where the gamut and colorGamut parameters are your UITraitCollection .displayGamut value used to determine the correct color space to use. The sRBG to DCI-P3 color space convertion will occur only on compatible devices.

🔰 Installation

CocoaPods

1. Add the following entry in your Podfile:

   pod 'GLColor'
   

2. Run pod install

Manual installation

1. Download the latest version
2. Copy the GLColor.swift file in your Xcode project structure

Devices supporting DCI-P3 color space:

📱 iOS:

• iPhone X
• iPhone 8/8 Plus
• iPhone 7/7 Plus
• iPad Pro 12.9-inch (2nd generation)
• iPad Pro 10.5-inch
• iPad Pro (9.7-inch)

🖥 macOS:

• iMac Retina 5K Late 2015+
• iMac Retina 4K Late 2015+
• iMac Pro Late 2017+
• MacBook Pro 2016+

📺 tvOS:

• Apple TV 4th gen+

📚 Further readings

• sRBG - https://en.wikipedia.org/wiki/SRGB
• DCI-P3 - https://en.wikipedia.org/wiki/DCI-P3