//
//  UIColorExtension.swift
//  IMUIChat
//
//  Created by oshumini on 2017/3/3.
//  Copyright © 2017年 HXHG. All rights reserved.
//

import Foundation
import UIKit

public extension UIColor {
  @objc 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)
  }
  
  @objc convenience init(netHex: Int) {
    self.init(red: (netHex >> 16) & 0xff, green: (netHex >> 8) & 0xff, blue: netHex & 0xff)
    
  }
  
  @objc class func hexStringToUIColor (hex:String) -> UIColor {
    var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
    
    if (cString.hasPrefix("#")) {
      cString.remove(at: cString.startIndex)
    }
    
    if ((cString.count) != 6) {
      return UIColor.gray
    }
    
    var rgbValue:UInt32 = 0
    Scanner(string: cString).scanHexInt32(&rgbValue)
    
    return UIColor(
      red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
      alpha: CGFloat(1.0)
    )
  }
}