当准备 segue 数组不包含数据时（使用 swift）

根据按下的按钮，我想将单词列表附加到在开始时声明的变量（pickedList）。当我准备继续时，它会覆盖已添加的内容，并且仅使用开始时添加的空数组。我可以在准备继续位中添加项目并将这些项目转移过来，但这不是我想要的。我对编程非常陌生，并且进行了很多搜索，但似乎找不到我要找的东西。提前致谢！

代码如下所示：

类 activeLiteracyOptionsViewController: UIViewController {

@IBOutlet weak var satpinButton: UIButton!
var pickedList = [String]()

@IBAction func whenSatpinButtonPressed(sender: AnyObject) {

    pickedList += ["s","a","t","p","i","n"]      
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

   let destinationViewController : flashcardsViewController = segue.destinationViewController as                flashcardsViewController

   destinationViewController.listToPlay = pickedList

我从没有以编程方式执行转场的情况推断出您必须同时设置IBAction以及 Interface Builder 中按钮的转场。问题是segue（和prepareForSegue）可以被称为before the IBAction叫做。您应该删除该转场，并创建一个新的转场，您可以从IBAction.

Therefore, you should not have the segue attached to the button in Interface Builder, but rather only have the button hooked up to the IBAction. You can then define a segue between the two scenes controller by control-dragging from the view controller button in the bar above the source scene to the destination scene:

在场景之间添加此 Segue（但不是从源场景中的按钮）后，您现在可以在 Interface Builder 中选择该 Segue，转到属性检查器，并为该 Segue 提供唯一的“故事板标识符”：

如果你给它一个标识符SegueToSecondScene，您现在可以定义您的IBAction to set pickedList然后以编程方式执行segue：

@IBAction func whenSatpinButtonPressed(sender: AnyObject) {
    pickedList += ["s","a","t","p","i","n"]      
    performSegueWithIdentifier("SegueToSecondScene", sender: self)
}