IOS中十六进制的颜色转换为UIColor

#pragma mark - 颜色转换 IOS中十六进制的颜色转换为UIColor+ (UIColor *) colorWithHexString: (NSString *)color{    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];        // String should be 6 or 8 characters    if ([cString length] < 6) {        return [UIColor clearColor];    }        // 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 clearColor];        // Separate into r, g, b substrings    NSRange range;    range.location = 0;    range.length = 2;        //r    NSString *rString = [cString substringWithRange:range];        //g    range.location = 2;    NSString *gString = [cString substringWithRange:range];        //b    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];}