o2oa-ios/O2Platform/Extension/UIColor+Extension.swift

//
//  UIColor+Extension.swift
//  o2app
//
//  Created by 刘振兴 on 2017/8/18.
//  Copyright © 2017年 zone. All rights reserved.
//

import Foundation
import UIKit

extension UIColor {
    
    /// EZSE: init method with RGB values from 0 to 255, instead of 0 to 1. With alpha(default:1)
    public convenience init(r: CGFloat, g: CGFloat, b: CGFloat, a: CGFloat = 1) {
        self.init(red: r / 255.0, green: g / 255.0, blue: b / 255.0, alpha: a)
    }
    
    
    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)
    }
    
   
    
    static var random: UIColor {
            let maxValue: UInt32 = 24
            return UIColor(red: CGFloat(arc4random() % maxValue) / CGFloat(maxValue),
                           green: CGFloat(arc4random() % maxValue) / CGFloat(maxValue) ,
                           blue: CGFloat(arc4random() % maxValue) / CGFloat(maxValue) ,
                           alpha: 1)
        }
        
   
        convenience init(netHex:Int) {
            self.init(red:(netHex >> 16) & 0xff, green:(netHex >> 8) & 0xff, blue:netHex & 0xff)
        }
    
    convenience init(hex string: String) {
        var hex = string.hasPrefix("#")
            ? String(string.dropFirst())
            : string
        guard hex.count == 3 || hex.count == 6
            else {
                self.init(white: 1.0, alpha: 0.0)
                return
        }
        if hex.count == 3 {
            for (index, char) in hex.enumerated() {
                hex.insert(char, at: hex.index(hex.startIndex, offsetBy: index * 2))
            }
        }
        
        guard let intCode = Int(hex, radix: 16) else {
            self.init(white: 1.0, alpha: 0.0)
            return
        }
        
        self.init(
            red:   CGFloat((intCode >> 16) & 0xFF) / 255.0,
            green: CGFloat((intCode >> 8) & 0xFF) / 255.0,
            blue:  CGFloat((intCode) & 0xFF) / 255.0, alpha: 1.0)
    }
    
    public func alpha(_ value: CGFloat) -> UIColor {
        return withAlphaComponent(value)
    }
    
    class func rgb(_ r: Int, _ g: Int, _ b: Int, _ alpha: CGFloat) -> UIColor {
        return UIColor.init(red: CGFloat(r)/255.0, green: CGFloat(g)/255.0, blue: CGFloat(b)/255.0, alpha: alpha / 1.0)
    }
    
    class func hexRGB(_ rgbValue: Int, _ alpha: CGFloat) -> UIColor {
        return UIColor.init(red: ((CGFloat)((rgbValue & 0xFF0000) >> 16))/255.0, green: ((CGFloat)((rgbValue & 0xFF00) >> 8))/255.0, blue: ((CGFloat)(rgbValue & 0xFF))/255.0, alpha: alpha / 1.0)
    }
    
    /**
     *  16进制 转 RGBA
     */
    class func UIColorFromRGBA(rgb:Int, alpha:CGFloat) ->UIColor {
        
        return UIColor(red: ((CGFloat)((rgb & 0xFF0000) >> 16)) / 255.0,
                       green: ((CGFloat)((rgb & 0xFF00) >> 8)) / 255.0,
                       blue: ((CGFloat)(rgb & 0xFF)) / 255.0,
                       alpha: alpha)
    }
    
    /**
     *  16进制 转 RGB
     */
    class func UIColorFromRGB(rgb:Int) ->UIColor {
        
        return UIColor(red: ((CGFloat)((rgb & 0xFF0000) >> 16)) / 255.0,
                       green: ((CGFloat)((rgb & 0xFF00) >> 8)) / 255.0,
                       blue: ((CGFloat)(rgb & 0xFF)) / 255.0,
                       alpha: 1.0)
    }
    
    // MARK: -  RGBA
    class func RGBA(r:CGFloat,g:CGFloat,b:CGFloat,a:CGFloat) -> UIColor {
        return UIColor(red: r/255.0, green: g/255.0, blue: b/255.0, alpha: a)
    }
    
    // MARK: - HexInt Covert UIColor
    class func hexInt(_ hexValue:Int) -> UIColor {
      return hexInt(hexValue, 1.0)
    }
    
    // MARK: - HexInt alpha Covert UIColor
    class func hextIntWithAlpha(_ hexValue:Int,_ alpha:CGFloat) -> UIColor {
        return hexInt(hexValue,alpha)
    }
    
    // MARK: - 私有方法实现
    fileprivate class func hexInt(_ hexValue:Int,_ alpha:CGFloat)  -> UIColor {
        return UIColor(red: ((CGFloat)((hexValue & 0xFF0000) >> 16)) / 255.0,
                       green: ((CGFloat)((hexValue & 0xFF00) >> 8)) / 255.0,
                       blue: ((CGFloat)(hexValue & 0xFF)) / 255.0,
                       alpha: alpha)
    }
}