我想让UIBarButtonItem与setEditing协同工作

Question

我在使用setEditing处理UIBarButtonItem时遇到了问题

    let add = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addTapped))
let play = UIBarButtonItem(title: "Play", style: .plain, target: self, action: #selector(playTapped))

navigationItem.rightBarButtonItems = [add, play]

在viewDidLoad外部写入常量(add、play )时

我可以在函数setEditing中调用常量名称

override func setEditing(_ editing: Bool, animated: Bool) {
    super.setEditing(editing, animated: animated)
    
    if isEditing{
        
    }else{

    }

但是它正在写任何东西，即使打印出来，它也不能工作。

在viewDidLoad中编写它时

一切都正常，但我不能在函数setEditing中调用它

我想隐藏播放按钮，并在setEditing函数中显示它

Answer 1

我在想像这样的东西：

class ViewController: UIVewController {
    var add : UIBarButtonItem?
    var play : UIBarButtonItem?

override func viewDidLoad() {
    super.viewDidLoad()

    add = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addTapped))
    play = UIBarButtonItem(barButtonSystemItem: .play, target: self, action: #selector(playTapped))
    navigationItem.rightBarButtonItems = [add!]
    
}

override func setEditing(_ editing: Bool, animated: Bool) {
super.setEditing(editing, animated: animated)

if isEditing{

    navigationItem.rightBarButtonItems = [add!]

    
}else{

    navigationItem.rightBarButtonItems = [add!, play!]

}