好吧，我认为外观代理不能像我预期的那样工作。我在初始化 UIBarButtonItem 的地方之前复制粘贴的自定义方法，并且它作为魅力。

Well, I've figured that apperance proxy doesn't work as I expected. I copy-pasted customization method right before a place where UIBarButtonItem is initialized, and it worked as charm.