ios - 无法使用tvos中的文本字段导出集合将文本字段设置为becomeFirstResponder()

Question

我获取了文本字段导出集合并在那里绑定(bind)了六个文本字段。我想成为文本字段导出集合中下一个文本字段的第一响应者。我从 Storyboard 中给文本字段标记 0 到 5。看，

主视图 Controller :

class ViewController: UIViewController {

    @IBOutlet var txtSignUp: [UITextField]!
    var arrayPlaceHolder:NSArray!

    override func viewDidLoad() {
        super.viewDidLoad()

        arrayPlaceHolder = NSArray(array: ["1","2","3","4","5","6"])
        self.setTextFieldValue()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    private func setTextFieldValue(){

        for txtField in txtSignUp{
            let tagTxt = txtField.tag
            txtField.attributedPlaceholder = NSAttributedString(string:arrayPlaceHolder[tagTxt] as! String, attributes:[NSForegroundColorAttributeName:UIColor.black])
            if(tagTxt != ((arrayPlaceHolder.count) - 1)){
                txtField.returnKeyType = .next
            }
            txtField.delegate = self
        }
    }

}

extension ViewController:UITextFieldDelegate{

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

        textField.resignFirstResponder()

            for txt in txtSignUp{
                let nextTxt = (textField.tag + 1)
                if txt.tag == nextTxt {
                    txt.becomeFirstResponder()
                    break
                }
            }
            return true
        }
}

错误:

其 View 不在窗口层次结构中!

说明:

在此代码中，我无法成为下一个文本字段，成为 FirstResponder。

谁能帮我解决这个问题。

Answer 1

在 TVos 上，您必须使用 textFieldDidEndEditing 函数，因为 textFieldShouldReturn 无法设置下一个响应者:

class MyViewController: UIViewController{
    @IBOutlet weak var firstTextField: UITextField!
    @IBOutlet weak var secondTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        firstTextField.delegate = self
        secondTextField.delegate = self
        firstTextField.tag = 0
        secondTextField.tag = 1
    }
}
extension MyViewController: UITextFieldDelegate {
    func textFieldDidEndEditing(_ textField: UITextField) {
        if (textField.tag == 0){
            secondTextField.becomeFirstResponder()
        }
    }
}