设置后，UIBarButtonItem未突出显示

Question

我已经声明了两个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，当点击btnSave时，设置btnEdit  as rightBarButtonItem。

它工作正常，我可以点击它，但在第一次点按按钮褪色/不突出显示状态。图像附加。 我如何使它具有正常的状态？

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

以下是固定代码

 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

    }
}