无法在视图控制器之间传递图像

Question

如问题所问。在我的第一个 VC 中，我设置了一个将图像传递给另一个 VC 的函数，如下所示。

 @objc func imageTapped(tapGestureRecognizer1: UITapGestureRecognizer) {
        let passimage = tapGestureRecognizer1.view as! UIImageView
        let alertController = UIAlertController(title: "...", message: "...", preferredStyle: UIAlertController.Style.alert)
        let ok = UIAlertAction(title: "...", style: UIAlertAction.Style.default, handler: {(action) -> Void in
            self.performSegue(withIdentifier: "Shop", sender: self)
            print("image tapped")
            
            let sb = self.storyboard?.instantiateViewController(withIdentifier: "shopVC") as! shopVC
            sb.loadimage = passimage.image
            self.present(sb, animated: true, completion: nil)
        })
        alertController.addAction(ok)
        alertController.addAction(UIAlertAction(title: "取消（留在此版面）", style: UIAlertAction.Style.cancel, handler: nil))
        self.present(alertController, animated: true, completion: nil)
    }

在另一个 VC 上，我设置了一个图像视图，它会读取此处显示的图像。

class shopVC: UIViewController {
    @IBOutlet weak var clothimage: UIImageView!
 var loadimage: UIImage?
    
    override func viewDidLoad() {
        
        clothimage.image = loadimage
        
        super.viewDidLoad()
        
    }

我知道“passimage.image”是我想要的，因为它显示在调试中 window - 我似乎无法将它放在第二个 VC 中。

Answer 1

需要先调用super.viewDidLoad()再设置clothimage

Answer 2

更改 ViewController 您同时使用两个选项，单独使用时，每个：

// optionOne
    self.performSegue(withIdentifier: "Shop", sender: self)
                print("image tapped")

// optionTwo                
                let sb = self.storyboard?.instantiateViewController(withIdentifier: "shopVC") as! shopVC
                sb.loadimage = passimage.image
                self.present(sb, animated: true, completion: nil)

如果使用选项一，您必须从 firstVC 覆盖以下函数并直接设置图像：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let vc = segue.destination as? shopVC {
            vc.image = yourImage
        }
    }

如果您将 present 用于 show ShopVC，则无需更改代码，只需注释 performSegue 函数即可。这意味着只有以下代码：

let sb = self.storyboard?.instantiateViewController(withIdentifier: "shopVC") as! shopVC
                    sb.loadimage = passimage.image
                    self.present(sb, animated: true, completion: nil)

无法在视图控制器之间传递图像

Unable to pass image between view controllers

swift

xcode

image

imageview

viewcontroller