請問老師在swift 語言中怎樣直接使用16進制的色值

恩格貝

2015-03-11

源自：玩兒轉Swift 9-3

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Kalpa曉回答被采納 +3 積分
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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恩格貝提問者

非常感謝！

2016-04-27 回復有任何疑惑可以回復我~

拾稻子
2016-11-23

已用粗體標出。

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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))?
??? }
這些需要改動的。