Rgba.swift

//
//  Rgba.swift
//  ha1f-chat
//
//  Created by ST20591 on 2017/07/19.
//  Copyright © 2017年 ha1f. All rights reserved.
//

import UIKit

struct Rgba {
    // MARK: Properties
    let red: CGFloat
    let green: CGFloat
    let blue: CGFloat
    let alpha: CGFloat
    
    // MARK: Getter
    var colorHex: UInt32 {
        let iRed = UInt32(red * 255.0)
        let iGreen = UInt32(green * 255.0)
        let iBlue = UInt32(blue * 255.0)
        
        return (iRed << 16) + (iGreen << 8) + iBlue
    }
    
    var uiColor: UIColor {
        return UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }
    
    // MARK: Initializer
    init(hex: UInt32, alpha: CGFloat = 1.0) {
        self.red = CGFloat((hex & 0xFF0000) >> 16) / 255.0
        self.green = CGFloat((hex & 0x00FF00) >> 8) / 255.0
        self.blue = CGFloat(hex & 0x0000FF) / 255.0
        self.alpha = alpha
    }
    
    init?(color: UIColor) {
        var fRed: CGFloat = 0
        var fGreen: CGFloat = 0
        var fBlue: CGFloat = 0
        var fAlpha: CGFloat = 0
        guard color.getRed(&fRed, green: &fGreen, blue: &fBlue, alpha: &fAlpha) else {
            return nil
        }
        self.red = fRed
        self.green = fGreen
        self.blue = fBlue
        self.alpha = fAlpha
    }
}