ios - 如何将选定的图像从 UIImagePickerController 传递到第二个 View Controller ？

Question

我竭尽全力寻找这个问题的答案。在我正在创建的应用程序中，用户将单击 addImage 按钮，然后从 ImagePickerController 的照片库(或相机)中选择一个图像，然后将所选图像传递到第二个 View Controller 上的 ImageView 。

我知道当 ImageView 与 addImage 按钮位于同一 View 时如何执行此操作，但无法弄清楚如何正确使用 segue 将图像传递到第二个 View 。希望有人能帮我解决这个问题。

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate{

        var newImage = UIImage(named: "")


    @IBOutlet var imageView: UIImageView!

    var imagePicker = UIImagePickerController()

    override func viewDidLoad() {
        super.viewDidLoad()

        imagePicker.delegate = self

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func addImage(sender: UIButton) {

        var alert = UIAlertController(title: "Please Get An Image", message: "Choose from below", preferredStyle: .Alert)

        alert.addAction(UIAlertAction(title: "Camera", style: .Default, handler: {(action) -> Void in

                        self.imagePicker.sourceType = UIImagePickerControllerSourceType.Camera
                        self.presentViewController(self.imagePicker, animated: true, completion: nil)
        }))

        alert.addAction(UIAlertAction(title: "Photo Library", style: .Default, handler: {(action) -> Void in

                        self.imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
                        self.presentViewController(self.imagePicker, animated: true, completion: nil)
        }))

        alert.addAction(UIAlertAction(title: "Cancel", style: .Default, handler: {(action) -> Void in

            self.dismissViewControllerAnimated(true, completion: nil)



        }))


            self.presentViewController(alert, animated: true, completion: nil)

    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {

        newImage = image

     //not sure about this next line here...
     performSegueWithIdentifier("VC2", sender: self)


      self.dismissViewControllerAnimated(true, completion: nil)

    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

        var secondViewController: VC2 = segue.destinationViewController as! VC2
        secondViewController.imageView.image = newImage




    }


}// end of app

Answer 1

你不应该使用 UIImageView 对象传递 UIImage 因为这样传递图像不是一个好主意，相反你可以在 SecondViewController 中创建 UIImage 对象简单地将 UIImage 对象传递给它，然后在 SecondVC 中像这样使用这个图像对象

override func viewDidLoad() {
        super.viewDidLoad()
        if imageView != nil {
            imageView.image = newImage
        }
 }