ios - 在另一个 ViewController 中从 'UIImagePickerController' 更改 UIImageView 图像会因 'fatal error: unexpectedly found nil' 而崩溃

Question

我有 2 个 UIViewController:

ViewController“A”名为“RERUN_SETUP”，带有 UIImageView，ViewController“B”名为“SelectPhotos”，带有 imagePickerController。

ViewController 'A' 中的 UIImageView 上方有一个空的透明 UIButton，它会弹出 ViewController 'B' 并允许用户选择从 Camera 添加图片或来自照片。 ViewController“A”在 ViewController“B”中声明，但是当我尝试从 ViewController“B”更改 ViewController“A”上的 UIImageView 时，应用程序崩溃并出现错误

fatal error: unexpectedly found nil while unwrapping an Optional value.

下面是我的代码，任何帮助将不胜感激:)

View Controller “A”

class RERUN_SETUP: UITableViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIPopoverPresentationControllerDelegate  {
 //USER PICTURE
    @IBOutlet weak var RERUNpictureIn: UIImageView?

//TRANSPARENT BUTTON OVER THE IMAGE VIEW
@IBAction func imageButton(sender: AnyObject) {

    let popoverContent = self.storyboard?.instantiateViewControllerWithIdentifier("SelectPhotos")


    popoverContent!.modalPresentationStyle = .Popover
    popoverContent?.modalTransitionStyle = UIModalTransitionStyle.FlipHorizontal
    var popover = popoverContent!.popoverPresentationController

    if let popover = popoverContent!.popoverPresentationController {

        let viewForSource = sender
        popover.sourceView = self.view
        popoverContent!.preferredContentSize = CGSizeMake(100,80)
        popover.delegate = self
        popover.permittedArrowDirections = .Any


    }

    self.presentViewController(popoverContent!, animated: true, completion: nil)





}
func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {


    return UIModalPresentationStyle.None


}

View Controller “B”

import UIKit

class SelectPhotos: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
var savedImage = NSUserDefaults.standardUserDefaults().objectForKey("image")
var imageToSave = UIImage()
var otherController:RERUN_SETUP = RERUN_SETUP()

@IBAction func camera(sender: UIButton) {

    let pickerController = UIImagePickerController()
    pickerController.delegate = self
    pickerController.sourceType = UIImagePickerControllerSourceType.Camera
    pickerController.allowsEditing = true

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

}


@IBAction func photos(sender: AnyObject) {
    let pickerController = UIImagePickerController()
    pickerController.delegate = self
    pickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    pickerController.allowsEditing = true

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


}

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

    self.dismissViewControllerAnimated(true, completion: nil)

    self.imageToSave = image

    otherController.RERUNpictureIn!.image = image
}

override func viewDidLoad() {
    super.viewDidLoad()


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}

}

Answer 1

在 View Controller B 中，在图像选择器委托(delegate)方法中将图像保存到 nsuserdefault，然后在 View Controller A 中从 nsuserdefault 获取该图像。并设置图像。

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    let imageData = UIImagePNGRepresentation(image)
    NSUserDefaults.standardUserDefaults().setObject(imageData!, forKey: "image")
    NSUserDefaults.standardUserDefaults().synchronize()
}

并在您要设置图像的 View Controller 中

let imageData = NSUserDefaults.standardUserDefaults().objectForKey("image") as! NSData
imgView.image = UIImage(data: imageData)