ios - 需要在所有 VC 中添加通用的 UIBarButtonItem

Question

以下是一段无效的代码:

class Person {

        static fun addBtn(cName:UIViewController)
        {
           let rightBtn = UIBarButtonItem.init(title: "Right", style: .Plain, target: UIBarButtonItem.self, action:#selector(UIBarButtonItem.self.newMenuTapped(_:)))
           cName.navigationItem.rightBarButtonItem  = rightBtn
        }

    }
    extension UIBarButtonItem
    {

        func newMenuTapped(sender: UIBarButtonItem)
        {
        print("Tapped")
        }

    }

崩溃并出现此错误:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: unrecognized selector sent to class 0x14c830

有人可以指导我做错了什么吗？谢谢。

Answer 1

像这样为 UIViewController 创建一个扩展:

extension UIViewController {
    func addButton() {
        let button = UIBarButtonItem(title: "Right", style: .Plain, target: self, action: #selector(self.rightButtonPressed(_:)))
        self.navigationItem.setRightBarButtonItem(button, animated: false)
    }

    func rightButtonPressed(sender: UIBarButtonItem) {
        print("tapped")
    }
}

然后在所有要实现按钮的 View Controller 中调用 self.addButton()。