16进制颜色字符串转为UIColor

Posted 2020-09-19 yutingliuyl

//16进制颜色(html颜色值)字符串转为UIColor

+(UIColor *) hexStringToColor: (NSString *) stringToConvert

{

     NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

     // String should be 6 or 8 characters

 

     if ([cString length] < 6) return [UIColor blackColor];

     // strip 0X if it appears

     if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];

     if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];

     if ([cString length] != 6) return [UIColor blackColor];

 

     // Separate into r, g, b substrings

 

     NSRange range;

     range.location = 0;

     range.length = 2;

     NSString *rString = [cString substringWithRange:range];

     range.location = 2;

     NSString *gString = [cString substringWithRange:range];

     range.location = 4;

     NSString *bString = [cString substringWithRange:range];

     // Scan values

     unsigned int r, g, b;

 

     [[NSScanner scannerWithString:rString] scanHexInt:&r];

     [[NSScanner scannerWithString:gString] scanHexInt:&g];

     [[NSScanner scannerWithString:bString] scanHexInt:&b];

 

     return [UIColor colorWithRed:((float) r / 255.0f)

                                 green:((float) g / 255.0f)

                                   blue:((float) b / 255.0f)

                                 alpha:1.0f];

}