Swift 解析16进制颜色

概述Swift 版 解析16进制颜色 extension UIColor { public convenience init(hex: String) { var red: CGFloat = 0.0 var green: CGFloat = 0.0 var blue: CGFloat = 0.0 var alpha: Swift 版 解析16进制颜色

extension UIcolor {    public convenIEnce init(hex: String) {        var red:   CGfloat = 0.0        var green: CGfloat = 0.0        var blue:  CGfloat = 0.0        var Alpha: CGfloat = 1.0        var hex:   String = hex        if hex.hasPrefix("#") {            let index = hex.index(hex.startIndex,offsetBy: 1)            hex = String(hex[index...])        }        let scanner = Scanner(string: hex)        var hexValue: CUnsignedLongLong = 0        if scanner.scanHexInt64(&hexValue) {            switch (hex.count) {            case 3:                red   = CGfloat((hexValue & 0xF00) >> 8)       / 15.0                green = CGfloat((hexValue & 0x0F0) >> 4)       / 15.0                blue  = CGfloat(hexValue & 0x00F)              / 15.0            case 4:                red   = CGfloat((hexValue & 0xF000) >> 12)     / 15.0                green = CGfloat((hexValue & 0x0F00) >> 8)      / 15.0                blue  = CGfloat((hexValue & 0x00F0) >> 4)      / 15.0                Alpha = CGfloat(hexValue & 0x000F)             / 15.0            case 6:                red   = CGfloat((hexValue & 0xFF0000) >> 16)   / 255.0                green = CGfloat((hexValue & 0x00FF00) >> 8)    / 255.0                blue  = CGfloat(hexValue & 0x0000FF)           / 255.0            case 8:                red   = CGfloat((hexValue & 0xFF000000) >> 24) / 255.0                green = CGfloat((hexValue & 0x00FF0000) >> 16) / 255.0                blue  = CGfloat((hexValue & 0x0000FF00) >> 8)  / 255.0                Alpha = CGfloat(hexValue & 0x000000FF)         / 255.0            default:                print("InvalID RGB string,number of characters after '#' should be either 3,4,6 or 8",terminator: "")            }        } else {            print("Scan hex error")        }        self.init(red:red,green:green,blue:blue,Alpha:Alpha)    }}

使用方式

let _ = UIcolor(hex: "#eeeeee")

总结

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