ios - 如何将数据从 View Controller 传递到导航 Controller ，然后再传递到另一个 View Controller ？

Question

我有来自 View Controller 的数据，我想传递另一个 View Controller ，但我已将其设置为模态显示，因此我在它们之间有一个导航 Controller 。如何将数据从第一个 View Controller 通过导航 Controller 传递到第二个 View Controller ？

我在第一个 View Controller 中有这段代码:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "presentPopup"
    {
        let destViewController = segue.destination as! NavigationViewController
        destViewController.myData2 = myData
    }
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}

然后导航 Controller 中的这段代码:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let destViewController = segue.destination as! SecondViewController
    destViewController.myData3 = myData2
}

但它不起作用。

Answer 1

您可以在 First ViewController 中使用它:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "presentPopup"
    {
        let destViewController = segue.destination as! NavigationViewController
        let secondViewcontroller = destViewController.viewcontrollers.first as! SecondViewcontroller
        secondViewcontroller.myData2 = myData
    }
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}