您是否尝试过放置UIBarButton项目?您可以将其放在情节提要中的导航栏上。您可以像下面这样以编程方式创建它,并将其设置为导航栏的导航项。
let btn1 = UIButton(type: .custom)
btn1.setImage(UIImage(named: "imagename"), for: .normal)
btn1.addTarget(self, action: #selector(methodname), for: .touchUpInside)
let item1 = UIBarButtonItem(customView: btn1)
self.navigationItem.setRightBarButtonItems([item1], animated: true)