请问老师在swift 语言中怎样直接使用16进制的色值

恩格贝

2015-03-11

源自：玩儿转Swift 9-3

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5 回答

Kalpa晓回答被采纳 +3 积分
2016-04-06

func UIColorFromRGB (hex:String) -> UIColor {

var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString

if (cString.hasPrefix("#")) {

cString = (cString as NSString).substringFromIndex(1)

}

let rString = (cString as NSString).substringToIndex(2)

let gString = ((cString as NSString).substringFromIndex(2) as NSString).substringToIndex(2)

let bString = ((cString as NSString).substringFromIndex(4) as NSString).substringToIndex(2)

var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;

NSScanner(string: rString).scanHexInt(&r)

NSScanner(string: gString).scanHexInt(&g)

NSScanner(string: bString).scanHexInt(&b)

return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))

}

eg:

self.setTitleColor(UIColorFromRGB("0xec8c00"), forState: .Selected)

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恩格贝提问者

非常感谢！

2016-04-27 回复有任何疑惑可以回复我~

拾稻子
2016-11-23

已用粗体标出。

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拾稻子
2016-11-23

func UIColorFromRGB (hex:String) -> UIColor {
        var cString:String = hex.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)
        if (cString.hasPrefix("#")) {
            cString = (cString as NSString).substring(from: 1)
        }
        let rString = (cString as NSString).substring(to: 2)
        let gString = ((cString as NSString).substring(from: 2) as NSString).substring(to: 2)
        let bString = ((cString as NSString).substring(from: 4) as NSString).substring(to: 2)
        var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;
        Scanner(string: rString).scanHexInt32(&r)
        Scanner(string: gString).scanHexInt32(&g)
        Scanner(string: bString).scanHexInt32(&b)
        return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))
    }
这些需要改动的。