UIImage 没有从一个 ViewController 传递到另一个

Question

我正在尝试将从 UIImagePickerController 捕获的图像传递给另一个 ViewController，但图像没有传递。

这是第一个ViewController的代码：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
{
    chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage 
    newImageView.contentMode = .scaleAspectFit 
    newImageView.image = chosenImage 

    self.performSegue(withIdentifier: "pass", sender: self)

    dismiss(animated:true, completion: nil) 

    let svc = self.storyboard!.instantiateViewController(withIdentifier: "demoViewController") as! demoViewController
   present(svc, animated: true, completion: nil)

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "pass"
    {
        let imgpass = segue.destination as! demoViewController
        imgpass.newphoto = chosenImage
    }
}

第二个代码 ViewController:

override func viewDidLoad() {
    super.viewDidLoad()

    myImageView.image = newphoto
}

我浏览了很多其他类似的帖子并实现了它们，但无法通过图像。

Answer 1

试试这个

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
    {
        if let chosenImage = info[UIImagePickerControllerOriginalImage] as? UIImage {

        newImageView.contentMode = .scaleAspectFit
        newImageView.image = chosenImage

        picker.dismiss(animated: true, completion: nil)

        let svc = self.storyboard!.instantiateViewController(withIdentifier: "demoViewController") as! demoViewController
        svc.newphoto = chosenImage
        self.present(svc, animated: true, completion: nil)
    }
}

Answer 2

问题是您的 func prepare(for:sender:) 实现从未被调用，因此您的 newphoto 从未被设置。 prepare(for:sender:) 在 segue 之前发送。但是没有segue。您在代码中呈现 ，而不是使用 segue。

UIImage 没有从一个 ViewController 传递到另一个

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