如何实例化视图控制器，调用函数时IBOutlets为零

Question

这是我的弹出视图控制器：

import UIKit

class PopupViewController: UIViewController {
    
    var bigVC = GameViewController()
    var cardPhoto: UIImage?
    var nameLabel: String?
    var bio: String?
    var index: Int?
    
    @IBOutlet weak var photo: UIImageView!
    @IBOutlet weak var label: UILabel!
    @IBOutlet weak var button: UIButton!
    @IBOutlet weak var story: UILabel!
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        let storyboard: UIStoryboard = UIStoryboard.init(name: "Main", bundle: nil)
        let firstViewController: GameViewController = storyboard.instantiateViewController(withIdentifier: "GameScreen") as! GameViewController
        
        photo.image = cardPhoto
        label.text = nameLabel
        story.text = bio
        
        
    }
    
    
    @IBAction func removePressed(_ sender: UIButton) {
        
        bigVC.removingCard(indexToRemove: index!)
        bigVC.resetImages()
        dismiss(animated: true, completion: nil)
        
    }
    
    
}

我的函数 bigVC.resetImages() 需要更改为 UIButtons 数组中 7 个按钮的图像。该函数完美运行，但当从其他视图控制器调用该函数时，数组返回 nil 并且应用程序崩溃。如何正确实例化视图控制器以便我调用这些按钮？

这是纸牌游戏的弹出视图控制器。它有一个按钮，按下该按钮应从玩家手中取出一张卡片并关闭弹出窗口以返回游戏视图控制器。怎么换

Answer 1

你需要设置

self.bigVC = firstViewController

然后需要等到 GameViewController 加载（调用 viewDidLoad）后再调用 resetImages。所以该数组不会返回 nil。

Answer 2

试试这个

@IBAction func removePressed(_ sender: UIButton) {
    let firstViewController = storyboard?.instantiateViewController(withIdentifier: "GameScreen") as! GameViewController
    
    firstViewController.removingCard(indexToRemove: index!)
    firstViewController.resetImages()
    dismiss(animated: true, completion: nil)
    
}