Sample styleguide implementation in Swift.
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README.md
Styleguide.swift
StyleguideHelpers.swift

README.md

Styleguide

Sample styleguide implementation in Swift.

For more: https://medium.com/@gokselkoksal/styling-with-swift-377d4afdb502

Font & Color

enum Color {
    static let black = UIColor.blackColor()
    static let tint = UIColor.greenColor()
}

enum Alpha {
    static let none     = CGFloat(0.0)
    static let veryLow  = CGFloat(0.05)
    static let low      = CGFloat(0.30)
    static let medium1  = CGFloat(0.40)
    static let medium2  = CGFloat(0.50)
    static let medium3  = CGFloat(0.60)
    static let high     = CGFloat(0.87)
    static let full     = CGFloat(1.0)
}

enum Font {
    static func withSize(size: CGFloat, weight: CGFloat) -> UIFont {
        return UIFont.systemFontOfSize(size, weight: weight)
    }
}

Usage

label.font = Font.withSize(15.0, UIFontWeightRegular)
label.textColor = Color.black

// Color + Alpha:
let colorWithAlpha = Color.red * Alpha.low

TextStyle

struct TextStyle {
    let font: UIFont
    let color: UIColor
}

Usage

titleLabel.style(TextStyle.title)
textLabel.style(TextStyle.body)

// Namespace your styles:
okButton.style(TextStyle.Button.action)
deleteButton.style(TextStyle.Button.destructive)
cancelButton.style(TextStyle.Button.cancel)

// Changing color of a text style:
let rareButtonStyle = TextStyle.Button.action + Color.white

// Applying alpha to a text style's color:
let rateButtonStyle = TextStyle.Button.action * Alpha.low

ViewStyle & LayerStyle

struct ViewStyle {
    
    struct LayerStyle {
        
        struct BorderStyle {
            let color: UIColor
            let width: CGFloat
        }
        
        struct ShadowStyle {
            let color: UIColor
            let radius: CGFloat
            let offset: CGSize
            let opacity: Float
        }
        
        let masksToBounds: Bool?
        let cornerRadius: CGFloat?
        let borderStyle: BorderStyle?
        let shadowStyle: ShadowStyle?
    }
    
    let backgroundColor: UIColor?
    let tintColor: UIColor?
    let layerStyle: LayerStyle?
}

Usage

button.style(ViewStyle.Button.rounded)
label.style(ViewStyle.Label.highlighted)

Styling Protocols

To use these style structs with your view objects, you just need to conform to TextStyling and ViewStyling protocols. Check StyleguideHelpers.swift class to see implementation for commonly used views.

protocol TextStyling {
    func style(style: TextStyle)
}

protocol ViewStyling {
    func style(style: ViewStyle)
}