ios - UITableView 从其他 Viewcontroller 添加行

Question

我有两个 View Controller ，一个带有 3 个 TableView ，另一个 Controller 我有一个 uitextfield 和在文本字段中输入的文本我想将它添加到另一个 View Controller 中名为 ScheduleTableView 的 TableView 之一。这是我的代码，但在 vc.ScheduleTableView.beginUpdates()

解包可选值时出现错误 unwrappedly found nil

@IBAction func addButtonTapped(_ sender: YTRoundedButton) {
   self.performSegue(withIdentifier: "secondvc", sender: self)

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier  == "secondvc" {
        print(TitleTextField.text!)

        let vc = segue.destination as! GrowthMainViewController

        vc.ScheduleArray.append(TitleTextField.text!)
        let indexPath = IndexPath(row: vc.ScheduleArray.count - 1, section: 0)
        vc.ScheduleTableView.beginUpdates()
        vc.ScheduleTableView.insertRows(at: [indexPath], with: .automatic)
        vc.ScheduleTableView.reloadData()
        vc.ScheduleTableView.endUpdates()



        TitleTextField.text = ""
        view.endEditing(true)

  }     
}

Answer 1

对此的解决方案是更改声明数组的位置(单例对此很好)，并删除不必要的插入、更新、重新加载等。

然后 numRowsInSection 方法调用 scheduleArray.count 来显示所有相应的数据。

之前:

@IBAction func addButtonTapped(_ sender: YTRoundedButton) {
   self.performSegue(withIdentifier: "secondvc", sender: self)

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier  == "secondvc" {
        print(TitleTextField.text!)

        let vc = segue.destination as! GrowthMainViewController

        vc.ScheduleArray.append(TitleTextField.text!)
        let indexPath = IndexPath(row: vc.ScheduleArray.count - 1, section: 0)
        vc.ScheduleTableView.beginUpdates()
        vc.ScheduleTableView.insertRows(at: [indexPath], with: .automatic)
        vc.ScheduleTableView.reloadData()
        vc.ScheduleTableView.endUpdates()



        TitleTextField.text = ""
        view.endEditing(true)

  }     
}

之后:

@IBAction func addButtonTapped(_ sender: YTRoundedButton) {
   self.performSegue(withIdentifier: "secondvc", sender: self)

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier  == "secondvc" {

        guard let text = TitleTextField.text else { return }
        scheduleArray.append(text)
        TitleTextField.text = ""
        view.endEditing(true)

  }     
}