iOS 如何从另一个 View Controller Swift 调用 func

Question

我有一个问题，我想从 firstVC 调用一个方法到 seccondVC 我尝试使用这样的代码:

let storyboard: UIStoryboard = UIStoryboard.init(name: "MainScreenVC", bundle: nil)
let firstViewController: MainScreenVC = storyboard.instantiateViewController(withIdentifier: "MainScreenVC") as! MainScreenVC
firstViewController.automatingFullFill()

但我立即收到错误消息，这是怎么回事？

我的错误:

'Could not find a storyboard named 'MainScreenVC' in bundle NSBundle

Answer 1

如果您为每个 View Controller 使用单独的 Storyboard，您必须提供 Storyboard名称和 View Controller 名称。

let storyboard: UIStoryboard = UIStoryboard.init(name: "give storyboard name here ", bundle: nil)
let firstViewController: MainScreenVC = storyboard.instantiateViewController(withIdentifier: "viewcontrollername here") as! MainScreenVC
firstViewController.automatingFullFill()

(或)你也可以这样调用它

 let mainScreenVC = UIStoryboard.init(name: "give Storyboard name here", bundle: nil).instantiateViewController(withIdentifier: "viewcontroller") as! MainScreenVC