swift Hex到UIColor

Posted 2021-05-19

// 
//  Color.swift
// 
// 
//  Usage
//  UIColor.HexColor.Red
//  UIColor.RGBColor.Red
// 

import Foundation
import UIKit

extension UIColor {

    convenience public init(hex: Int, alpha: CGFloat = 1.0) {
        let red = CGFloat((hex & 0xFF0000) >> 16) / 255.0
        let green = CGFloat((hex & 0xFF00) >> 8) / 255.0
        let blue = CGFloat((hex & 0xFF)) / 255.0
        self.init(red:red, green:green, blue:blue, alpha:alpha)
    }
    
    // make hex color list
    public struct HexColor {
        public static let Red = UIColor(hex: 0xF44336)
        public static let Blue = UIColor(hex: 0x2196F3)
        public static let Green = UIColor(hex: 0x4CAF50)
        // etc...
    }
    
    // make rgb color list
    public struct RGBColor {
        public static let Red = UIColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)
    }
}