How to pass a selected image from ImagePickerController to second view controller? - ios

Question

I've tried exhaustively to find the answer to this problem. In the app that I am creating the user will click addImage button and then select an image from the photo library (or camera) from ImagePickerController and then that selected image gets passed to an image view on a second view controller.
I know how to do this when the image view is on the same view as the addImage button but can't figure out how to properly use a segue to pass the image to the second view. Hopefully, someone can help me sort this out.
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

you should not pass the UIImage by using the UIImageView object because this is not a Good idea to pass the image like this, Instead you can create UIImage object in SecondViewController simple pass the UIImage object to that and in SecondVC use this image object like this
override func viewDidLoad() {
super.viewDidLoad()
if imageView != nil {
imageView.image = newImage
}
}

Answer 2

OK susan, so when you click "Use Photo" in the preview part of the camera, that's where you want to implement to segue to the second VC.
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
newImage = image
dismissViewControllerAnimated(true, completion: { () -> Void in
//Will call segue name
self.performSegueWithIdentifier("Your_Segue_name", sender: self)
})
}
EDIT: The above code will segue after you've confirmed that you want to use the image.
In your second VC, have a holder to hold then sent that holder image to your UIImageView. In your 1st VC, sent the image to transfer to the holder image.
Your SecondVC:
#IBOutlet var imgView: UIImageView!
var holderImage: UIImage?
In your viewDidLoad()
imgView.image = holderImage.image

Answer 3

Make sure the segue has its identifier set as "VC2". Also, instead of setting
secondViewController.imageView.image = newImage
expose a property on your secondViewController that takes the image. Set the property with the image in prepareForSegue.
secondViewController.image = newImage
Then, in viewDidLoad on secondViewController set its imageView with the value from the property.
override func viewDidLoad() {
super.viewDidLoad()
imageView.image = image
}
In your code the ImageView on the second controller doesn't exist yet because of the view life cycle.
You can also set a breakpoint in prepareForSegue to make sure it's being called properly and the second controller is being set properly.