Swift 16进制编码转UIColor

概述话不多说啊，直接上代码 import UIKit// MARK: 通过16进制初始化UIColorextension UIColor { convenience init?(hexNum: Int) { self.init(hexStr: String(hexNum, radix: 16)) } convenience init?(

话不多说啊，直接上代码

import UIKit// MARK: 通过16进制初始化UIcolorextension UIcolor {        convenIEnce init?(hexnum: Int) {        self.init(hexStr: String(hexnum,radix: 16))    }        convenIEnce init?(hexStr: String) {        var hex = hexStr.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)        if hex.hasPrefix("#") {            hex.remove(at: hex.startIndex)        }        if hex.hasPrefix("0x") || hex.hasPrefix(("0X")) {            hex.removeSubrange((hex.startIndex ..< hex.index(hex.startIndex,offsetBy: 2)))        }                guard let hexnum = Int(hex,radix: 16) else {            self.init()            return nil        }        switch hex.characters.count {        case 3:            self.init(red: CGfloat(((hexnum & 0xF00) >> 8).duplicate4bits) / 255.0,green: CGfloat(((hexnum & 0x0F0) >> 4).duplicate4bits) / 255.0,blue: CGfloat((hexnum & 0x00F).duplicate4bits) / 255.0,Alpha: 1.0)        case 4:            self.init(red: CGfloat(((hexnum & 0xF000) >> 12).duplicate4bits) / 255.0,green: CGfloat(((hexnum & 0x0F00) >> 8).duplicate4bits) / 255.0,blue: CGfloat(((hexnum & 0x00F0) >> 4).duplicate4bits) / 255.0,Alpha: CGfloat((hexnum & 0x000F).duplicate4bits) / 255.0)        case 6:            self.init(red: CGfloat((hexnum & 0xFF0000) >> 16) / 255.0,green: CGfloat((hexnum & 0x00FF00) >> 8) / 255.0,blue: CGfloat((hexnum & 0x0000FF) >> 0) / 255.0,Alpha: 1.0)        case 8:            self.init(red: CGfloat((hexnum & 0xFF000000) >> 24) / 255.0,green: CGfloat((hexnum & 0x00FF0000) >> 16) / 255.0,blue: CGfloat((hexnum & 0x0000FF00) >> 8) / 255.0,Alpha: CGfloat(hexnum & 0x000000FF) / 255.0)        default:            self.init()            return nil        }    }    }private extension Int {    var duplicate4bits: Int {        return self << 4 + self    }}

** 用法如下：**

let colorR = UIcolor(hexStr: "0xf00f")let colorG = UIcolor(hexStr: "0X0f0f")let colorB = UIcolor(hexStr: "#0fff")let colorRR = UIcolor(hexStr: "0xff0000ff")let colorGG = UIcolor(hexStr: "0X00ff00ff")let colorBB = UIcolor(hexStr: "#0000ffff")let colorRN = UIcolor(hexnum: 0xf00f)let colorGN = UIcolor(hexnum: 0x00ff00)let colorBN = UIcolor(hexnum: 0x0000ff)

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