swift - 16进制颜色扩展(1.支持# 2.支持不带# ， 3支持带0X)

 

 

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/**  *  设置16进制颜色:  *  可识别类型  *  1:有#  *  2:没有#  *  3:含有0X  */ extension UIColor{     class func hexadecimalColor(hexadecimal:String)->UIColor{         var cstr = hexadecimal.trimmingCharacters(in:  CharacterSet.whitespacesAndNewlines).uppercased() as NSString;         if(cstr.length < 6){             return UIColor.clear;         }         if(cstr.hasPrefix("0X")){             cstr = cstr.substring(from: 2) as NSString         }         if(cstr.hasPrefix("#")){             cstr = cstr.substring(from: 1) as NSString         }         if(cstr.length != 6){             return UIColor.clear;         }         var range = NSRange.init()         range.location = 0         range.length = 2         //r         let rStr = cstr.substring(with: range);         //g         range.location = 2;         let gStr = cstr.substring(with: range)         //b         range.location = 4;         let bStr = cstr.substring(with: range)         var r :UInt32 = 0x0;         var g :UInt32 = 0x0;         var b :UInt32 = 0x0;         Scanner.init(string: rStr).scanHexInt32(&r);         Scanner.init(string: gStr).scanHexInt32(&g);         Scanner.init(string: bStr).scanHexInt32(&b);         return UIColor.init(red: CGFloat(r)/255.0, green: CGFloat(g)/255.0, blue: CGFloat(b)/255.0, alpha: 1);     } }