Convert any color format to UIColor

UIColorExtensions.swift

import UIKit

extension UIColor {
    convenience init(r: CGFloat, g: CGFloat, b: CGFloat, a: CGFloat = 1.0) {
       self.init(red: r / 255.0, green: g / 255.0, blue: b / 255.0, alpha: a)
    }
    
   convenience init(red: Int, green: Int, blue: Int, a: Int = 0xFF) {
       assert(red >= 0 && red <= 255, "Invalid red component")
       assert(green >= 0 && green <= 255, "Invalid green component")
       assert(blue >= 0 && blue <= 255, "Invalid blue component")

       self.init(red: CGFloat(red) / 255.0,
                 green: CGFloat(green) / 255.0,
                 blue: CGFloat(blue) / 255.0,
                 alpha: CGFloat(a) / 255.0)
   }

   convenience init(rgb: Int) {
       self.init(
           red: (rgb >> 16) & 0xFF,
           green: (rgb >> 8) & 0xFF,
           blue: rgb & 0xFF
       )
   }
    
    convenience init(rgba: Int) {
        self.init(
            red: (rgba >> 16) & 0xFF,
            green: (rgba >> 8) & 0xFF,
            blue: rgba & 0xFF,
            a: (rgba >> 24) & 0xFF
        )
    }
    
    convenience init(hexString: String) {
        let hex = hexString.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int = UInt64()
        
        Scanner(string: hex).scanHexInt64(&int)
        
        let a, r, g, b: UInt64
        switch hex.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            (a, r, g, b) = (255, 0, 0, 0)
        }
        
        self.init(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
    }
}