Tyring to set UIImage from different fiew via delegation - ios

Question

I have a view controller with a UIImage that will be sent to a service. I'm trying to load this image from another view so I'm using delegation. However I cant seem to understand why it will not work. I set some messages to print in the console and I see them right before the call to the method but its not setting the variables and I'm not sure why.
The view are linked via a navigation controller and to return I use popViewController and to go to the other view controller I use a simple show segue from the button. The "confirmation" of the selected image is done with a button that is supposed to send the image to the previous view controller.
This is the main controller with the UIImage I want to set from another view:
import UIKit
class MainNewPost: UIViewController{
override var preferredStatusBarStyle: UIStatusBarStyle{
return.lightContent
}
var imageForUpload: UIImage?
var isImageSelected: Bool = false
#IBOutlet weak var newPostBox: TVUIView!
#IBOutlet weak var newPost: UIButton!
#IBAction func sendNewPost(_ sender: Any) {
var imageId = ""
if isImageSelected {
imageId = UUID().uuidString
ImageWS.sendIamge(imageId: imageId, image: imageForUpload!, {()}, error: {(errorMessate) in
print(errorMessate)
})
}
if (newPostBox.text!.isEmpty) {
Util.showMessage(controller: self, message: "Ingrese un texto", seconds: 5)
} else {
PostWS.newPost({() in
Util.showMessage(controller: self, message: "Enviaste un mensaje!", seconds: 3.0)
}, img: imageId, postBody: newPostBox.text!, personId: PersonBE.shared!.personId, posterName: PersonBE.shared!.displayName, error: {(errorMessage) in print(errorMessage)})
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
extension MainNewPost: NewPostDelegate {
// This is not executing. I'm calling it since I see the console message by the flag and image dont get set
func selectedImage(_ image: UIImage, _ isImageSelected: Bool) {
self.imageForUpload = image
self.isImageSelected = isImageSelected
}
}
This is the view controller where I select the image:
import UIKit
protocol NewPostDelegate {
func selectedImage(_ image: UIImage, _ isImageSelected: Bool)
}
class imageSelectViewController: UIViewController {
var postDelegate: NewPostDelegate?
#IBOutlet weak var imageView: UIImageView!
var imagePicker: ImagePicker!
override func viewDidLoad() {
super.viewDidLoad()
self.imagePicker = ImagePicker(presentationController: self, delegate: self)
}
#IBAction func showImagePicker(_ sender: UIButton) {
self.imagePicker.present(from: sender)
}
override var preferredStatusBarStyle: UIStatusBarStyle{
return.lightContent
}
#IBAction func clickBtnBack(_ sender: Any){
self.navigationController?.popViewController(animated: true)
}
#IBAction func selectImage(_ sender: Any) {
// I see this message printed in the console
// This button is suposed to send the selected image to the previous view controller
print("In selectImage button")
self.postDelegate?.selectedImage(imageView.image!, true)
self.navigationController?.popViewController(animated: true)
}
}
extension imageSelectViewController: ImagePickerDelegate {
func didSelect(image: UIImage?) {
// I see this message printed in the console
print("In didSelect delegate method")
self.imageView.image = image
self.postDelegate?.selectedImage(image!, true)
}
}
Thanks!

Answer 1

It seems that var postDelegate: NewPostDelegate? in your imageSelectViewController instance remains nil. Which means that even if you're calling a delegate method, there is no delegate specified itself.
In order to fix it you should assign your MainNewPost instance reference to var postDelegate: NewPostDelegate? of your destination imageSelectViewController while preparing for segue.