Accessing image from prepare segue error

Question

1. Normally, we link the image from storyboard to viewcontroller by IBOutlet by this code:

   @IBOutlet private weak var resultImage: UIImageView!
   

we can update the image by calling this: resultImage.image = UIImage(named: "image"). It works ok

2. However, when i call this in the prepare for segue, it found nil:

   let destinationDetail = segue.destination as! RestaurantViewController       
   destinationDetail.restaurantImage.image = UIImage(named: "image")
   

restaurantImage is an Outlet in RestaurantViewController: @IBOutlet weak var restaurantImage: UIImageView!

I dont understand why it found nil, please help!

Answer 1

Because view controlle haven't been set up yet. you can use IBOutlet after view is load. In viewDidLoad or viewDidAppear of your destination viewController you will do something like this:

override func viewDidLoad() {
    super.viewDidLoad()
    resultImage.image = newImage
}