siwft 开发快捷操作 扩展颜色操作类，16进制数字直接转换成对应的RGB。直接操作颜色，UIbutton点击不变化颜色

//
//  UiColorExtension.swift
//  geekTime
//
//  Created by liuan on 2020/9/14.
//  Copyright © 2020 liuan. All rights reserved.
//

import UIKit
extension UIColor {
    static func hexColor(_ hexValue:Int,alpahValue:Float)->UIColor{
        return UIColor(red: CGFloat((hexValue & 0xFF0000) >> 16 ) / 255, green: CGFloat((hexValue & 0x00FF00) >> 8) / 255, blue: CGFloat(hexValue & 0x0000FF ) / 255, alpha: CGFloat(alpahValue))
    }
    
    static func hexColor(_ hexValue:Int)->UIColor{
        return hexColor(hexValue,alpahValue: 1)
         
     }
 
    convenience init(_ hexValue:Int,alpahValue:Float) {
       
        self.init(red: CGFloat((hexValue & 0xFF0000) >> 16 ) / 255, green: CGFloat((hexValue & 0x00FF00) >> 8) / 255, blue: CGFloat(hexValue & 0x0000FF ) / 255, alpha: CGFloat(alpahValue))
    }
    
    convenience init(_ hexValue:Int) {
        self.init(hexValue,alpahValue:1)
    }
    
    convenience init(r:CGFloat,g:CGFloat,b:CGFloat,alpha:CGFloat = 1.0){
        self.init(displayP3Red: r/255.0, green: g/255.0, blue: b/255.0, alpha: alpha)
    }
    
    class func globalBackGroundColor() -> UIColor{
        return UIColor(r: 248, g: 249, b: 247)
    }
}

怎么使用？

loginButton.backgroundColor = UIColor.hexColor(0xf8892e)

效果有是有了，但是你点击按钮的时候却没有反馈的那种变暗的效果。。

是因为button 这样设置上去背景是优点问题的

可以通过另外一个扩展 toImage

//
//  UiColorExtension.swift
//  geekTime
//
//  Created by liuan on 2020/9/14.
//  Copyright © 2020 liuan. All rights reserved.
//

import Foundation
import UIKit
extension UIColor{
    static func hexColor(_ hexValue:Int,alpahValue:Float)->UIColor{
        return UIColor(red: CGFloat((hexValue & 0xFF0000) >> 16 ) / 255, green: CGFloat((hexValue & 0x00FF00) >> 8) / 255, blue: CGFloat(hexValue & 0x0000FF ) / 255, alpha: CGFloat(alpahValue))
    }
    
    static func hexColor(_ hexValue:Int)->UIColor{
        return hexColor(hexValue,alpahValue: 1)
         
     }
 
    convenience init(_ hexValue:Int,alpahValue:Float) {
       
        self.init(red: CGFloat((hexValue & 0xFF0000) >> 16 ) / 255, green: CGFloat((hexValue & 0x00FF00) >> 8) / 255, blue: CGFloat(hexValue & 0x0000FF ) / 255, alpha: CGFloat(alpahValue))
    }
    
    convenience init(_ hexValue:Int) {
        self.init(hexValue,alpahValue:1)
    }
    
    //颜色转换图片
    func toImage()-> UIImage{
        let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        context?.setFillColor(self.cgColor)
        context?.fill(rect)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
        
    }
}

用法

// loginButton.backgroundColor = UIColor.hexColor(0xf8892e)
        loginButton.setBackgroundImage(UIColor.hexColor(0xf8892e).toImage(), for: .normal)

点击的时候可以看到变暗。这便是这个扩展的作用。