如何重写这个类函数？

Question

我有一个扩展类，在这里我扩展了UIPutton，如下所示，它工作得很好。

extension UIButton {    
    class func backButtonTarget(_ target: Any, action: Selector) -> UIBarButtonItem {        
        let backButton = UIButton(frame: CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(58), height: CGFloat(15)))
        backButton.setTitle("Cancel",for: .normal)
        let barBackButtonItem = UIBarButtonItem(customView: backButton)
        backButton.addTarget(target, action: action, for: .touchUpInside)
        return barBackButtonItem
    }
}

但是现在，我需要为某个视图控制器更改它的标题，所以我想过它的重写，但是失败了。如何可以重写它，以便我可以更改它的标题？

Answer 1

使title成为函数的string参数，这样您就可以调用它并提供自定义标题。

class func backButtonTarget(_ target: Any, action: Selector, title: String) -> UIBarButtonItem {
        let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 58, height: 15))
        backButton.setTitle(title, for: .normal)
        let barBackButtonItem = UIBarButtonItem(customView: backButton)
        backButton.addTarget(target, action: action, for: .touchUpInside)
        return barBackButtonItem
    }
}