Swift 从另一个类调用当前 ViewController 的特定函数

Question

我的场景是，我试图从另一个类文件调用 ViewController 类文件的特定函数。在这里，我收到以下警告并且 ViewController 未呈现。

我的代码位于 ViewControllerA 下面

func previewview(){ // Inside ViewControllerA

 DispatchQueue.main.async {
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let fileViewController = storyboard.instantiateViewController(withIdentifier: "fileviewcontroller")
            let navController = UINavigationController(rootViewController: fileViewController)
            self.present(navController, animated: true, completion: nil)
        }  }

下面的代码在另一个类文件中

import UIKit

class FileController {

    //MARK:- Call a file preview
    ViewControllerA().self.previewview()
}

Warning: Attempt to present on whose view is not in the window hierarchy!

Answer 1

试试这个

Viewcontroller().FuncName()

示例:

LoginViewController().checkLoginValidation()