修改单个页面navigationBar颜色

[self.navigationController.navigationBar setBackgroundImage:[self createImageWithColor:COLOR_C1 size:CGSizeMake(1, 1)] forBarMetrics:UIBarMetricsDefault];

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