Question

我尝试在viewControllers之间传递值。但问题是，价值总是零。

在firstVC中我做：

// Create a custom view controller
let ratingVC = RatingViewController(nibName: "RatingView", bundle: nil)

// Create the dialog
let popup = PopupDialog(viewController: ratingVC, buttonAlignment: .horizontal, transitionStyle: .bounceDown, gestureDismissal: true)

ratingVC.selectedTestString = "HELLO"


// Present dialog
self.present(popup, animated: true, completion: nil)

在第二个VC中：

var selectedTestString: String! //Unwrapping because I know value does exist

override func viewDidLoad() {
        super.viewDidLoad()
    print(selectedTestString) //Gives nil

    }

我第一次使用.xib，但我认为概念应该是相同的。

Answer 1

在创建对话框之前设置selectedTestString的值，这将解决问题。

// Create a custom view controller
let ratingVC = RatingViewController(nibName: "RatingView", bundle: nil)

ratingVC.selectedTestString = "HELLO"

// Create the dialog
let popup = PopupDialog(viewController: ratingVC, buttonAlignment: .horizontal, transitionStyle: .bounceDown, gestureDismissal: true)

// Present dialog
self.present(popup, animated: true, completion: nil)

即使值确实存在，传递值也为零

1 个答案: