Color Convenience

UIColor+Extension.swift

import UIKit

extension UIColor {
  /**
   Initializes and returns a color object using the specified RGB component values.
   
   - Parameter red: Red value of the color object
   - Parameter green: Green value of the color object
   - Parameter blue: Green value of the color object
   
   - Returns: A new color object.
   */
  convenience init(red: Int, green: Int, blue: Int) {
    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: 1.0)
  }

  /**
   Extracts the red, green, and blue component values using the specified Int value
  
   - Parameter rgb: Integer that represents the rgb component values of the desired color
  
   - Returns: A new color object.
   */
  convenience init(rgb: Int) {
    self.init(
      red: (rgb >> 16) & 0xFF,
      green: (rgb >> 8) & 0xFF,
      blue: rgb & 0xFF
    )
  }