swift - UIBarButtonItem 设置后未突出显示

Question

我声明了两个 UIBarButtonItem，btnEdit 和 btnSave。最初我在 viewDidLoad 中设置 btnEdit 。如果用户点击 btnEdit 我想将 btnSave 设置为 rightBarButtonItem 并在点击 btnSave 时设置 btnEdit 作为 rightBarButtonItem。

它工作正常，我可以点击它，但第一次点击按钮消失/不处于突出显示状态。附图片。我如何使其具有正常状态？

var btnEdit : UIBarButtonItem!
var btnSave : UIBarButtonItem!

@objc func btnEditTapped (){
    textFieldViewNote.isEditable = true
    navigationItem.rightBarButtonItem = btnSave
}


@objc func btnSaveTapped (){
    textFieldViewNote.isEditable = false
    navigationItem.rightBarButtonItem = btnEdit

}



override func viewDidLoad() {
    super.viewDidLoad()
    btnSave = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(btnSaveTapped))
    btnEdit = UIBarButtonItem(barButtonSystemItem: .edit, target: self, action: #selector(btnEditTapped))
    navigationItem.rightBarButtonItem = btnEdit

}

After loading VC - Edit in normal state

After tapping on edit - Save btn in normal State

Edit faded tapping on save barbutton

Answer 1

下面是固定代码

 class ViewController: UIViewController {

    var btnEdit : UIBarButtonItem!
    var btnSave : UIBarButtonItem!

    @objc func btnEditTapped (){
        btnSave = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(btnSaveTapped));

      navigationItem.rightBarButtonItem = btnSave

    }


    @objc func btnSaveTapped (){
        btnEdit = UIBarButtonItem(barButtonSystemItem: .edit, target: self, action: #selector(btnEditTapped));        navigationItem.rightBarButtonItem = btnEdit


    }



    override func viewDidLoad() {
        super.viewDidLoad()
        btnSave = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(btnSaveTapped))
        btnEdit = UIBarButtonItem(barButtonSystemItem: .edit, target: self, action: #selector(btnEditTapped))
        navigationItem.rightBarButtonItem = btnEdit

    }
}