[self.navigationController.navigationBar setShadowImage:[Static ColorToImage:[Static colorWithHexString:[UIColor red]]]];

+ (UIImage *)ColorToImage:(UIColor *)color{        CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetFillColorWithColor(context, [color CGColor]);    CGContextFillRect(context, rect);        UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return theImage;}

+ (UIColor *) colorWithHexString: (NSString *)color{    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];        if ([cString length] < 6) {        return [UIColor clearColor];    }        if ([cString hasPrefix:@"0X"])        cString = [cString substringFromIndex:2];    if ([cString hasPrefix:@"#"])        cString = [cString substringFromIndex:1];    if ([cString length] != 6)        return [UIColor clearColor];        // 拆分    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    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];}