我如何将一个图像与另一个 ViewController 连接起来并在 ImageView 中显示它？

Question

以下代码允许用户 select 图库中的图像或拍摄照片并通过 ImageView 在 ViewController 中显示。我想在这里做的是传递从图库中拍摄或 select 编辑的图像，并将其传递到另一个 ViewController 并显示在 ImageView 中。理想情况下，一旦图片被 select 编辑或拍摄，ViewController 立即更改为第二个 ViewController 并在 ImageView 中显示图像。

如何实现？谢谢。

import Foundation
import UIKit
import MobileCoreServices
import AssetsLibrary
import AVFoundation
import SystemConfiguration

class ViewController: UIViewController, UITextViewDelegate, UINavigationControllerDelegate, UIImagePickerControllerDelegate, UITextFieldDelegate, UIPopoverControllerDelegate, UIAlertViewDelegate {

    var controller = UIImagePickerController()
    var assetsLibrary = ALAssetsLibrary()
    var selectedImage = UIImageView ()

    private var image: UIImage? // THIS ONE

    @IBOutlet weak var btnClickMe: UIButton!
    @IBOutlet weak var imageView: UIImageView!

    var picker:UIImagePickerController?=UIImagePickerController()
    var popover:UIPopoverController?=nil

    override func viewDidLoad() {
        super.viewDidLoad()
        picker!.delegate=self

    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

    @IBAction func btnImagePickerClicked(sender: AnyObject)
    {
        let alert:UIAlertController=UIAlertController(title: "Choose Image", message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)

        let cameraAction = UIAlertAction(title: "Camera", style: UIAlertActionStyle.Default)
            {
                UIAlertAction in
                self.openCamera()

        }
        let gallaryAction = UIAlertAction(title: "Gallery", style: UIAlertActionStyle.Default)
            {
                UIAlertAction in
                self.openGallary()
        }
        let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel)
            {
                UIAlertAction in

        }

        // Add the actions
        picker?.delegate = self
        alert.addAction(cameraAction)
        alert.addAction(gallaryAction)
        alert.addAction(cancelAction)
        // Present the controller
        if UIDevice.currentDevice().userInterfaceIdiom == .Phone
        {
            self.presentViewController(alert, animated: true, completion: nil)
        }
        else
        {
            popover=UIPopoverController(contentViewController: alert)
            popover!.presentPopoverFromRect(btnClickMe.frame, inView: self.view, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)
        }
    }
    func openCamera()
    {
        if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera))
        {
            picker!.sourceType = UIImagePickerControllerSourceType.Camera
            self .presentViewController(picker!, animated: true, completion: nil)
        }
        else
        {
            openGallary()
        }
    }
    func openGallary()
    {
        picker!.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
        if UIDevice.currentDevice().userInterfaceIdiom == .Phone
        {
            self.presentViewController(picker!, animated: true, completion: nil)
        }
        else
        {
            popover=UIPopoverController(contentViewController: picker!)
            popover!.presentPopoverFromRect(btnClickMe.frame, inView: self.view, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)
        }
    }
    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
    {
        picker .dismissViewControllerAnimated(true, completion: nil)
        imageView.image=info[UIImagePickerControllerOriginalImage] as? UIImage
        image = imageView.image!
        performSegueWithIdentifier("TEST", sender: self)
    }
    func imagePickerControllerDidCancel(picker: UIImagePickerController)
    {
        print("picker cancel.")

    }
}

这是我的第二个ViewController

 import UIKit

class ViewController2: UIViewController {

        var Image = UIImage ()

        @IBOutlet var imageView: UIImageView!

        override func viewDidLoad() {
            super.viewDidLoad()
            imageView.image = Image
        }

        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
        }
    }

Answer 1

在 class 之上定义一个变量，例如：

var selectedImage: UIImage

然后当您在该视图控制器中设置该图像并在另一个视图控制器中时，您只需显示您在第一个控制器中设置的图像。

Answer 2

编辑 2

鉴于您的代码中有太多错误，我将更具体一些。

首先：你需要了解UIImage和UIImageView的区别

其次：如果你想在用户 select 一张图片后执行 segue，你应该在 didFinishPickingMediaWithInfo 委托上调用该方法，如下所示：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
{
    picker .dismissViewControllerAnimated(true, completion: nil)
    imageView.image=info[UIImagePickerControllerOriginalImage] as? UIImage
    image = imageView.image!
    performSegueWithIdentifier("mySegueToNextViewController", sender: self)
}

另外，我添加了一个新的属性，叫做"image"（应该叫"selectedImage"，不过你以后可以改）。

private var image: UIImage? // THIS ONE

@IBOutlet weak var btnClickMe: UIButton!
@IBOutlet weak var imageView: UIImageView!

第三：在ViewController2你需要将图片库设置为UIImageView。

override func viewDidLoad() {
    super.viewDidLoad()
    imageView.image = selectedImage
}

最后：在情节提要中，select ViewController，转到编辑器 -> 嵌入 -> 导航控制器。

现在，应该可以正常工作了。

一旦你 select 图片，调用下面的方法：

performSegueWithIdentifier("mySegueToNextViewController", sender: self)

那么你需要实现：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "mySegueToNextViewController" {
        if let nextViewController = segue.destinationViewController as? NextViewController {

            nextViewController.image = selectedImage   
        }
    }

}

请记住，要使其正常工作，您应该在 NextViewController 上设置 public 属性（正如 Unis Barakat 所说）。然后在 NextViewController viewDidLoad() 上，您可以将图像设置为 imageView。

希望对您有所帮助！

我如何将一个图像与另一个 ViewController 连接起来并在 ImageView 中显示它？

How do I segue an image to another ViewController and display it within an ImageView?

image

viewcontroller

imageview

segue

swift

编辑 2