Unwind segue not dismissing view - swift

Question

The Issue:
Unwind segue not dismissing view, even though it works.
Scenario:
I have an "add product" screen, and when the product is added, I fire up unwind segue, which in turn shows a popup: "New Product added".
The Facts:
1) Product is successfully added to Database
2) the popup "Product added" is shown in the #IBAction of the unwind segue in target, and it appears
3) The popup "Product Added" is shown over the AddProductScreen view
Picture 1: Existence of Unwind segue
#IBAction located in target view:
#IBAction func unwindFromAddProductViewSuccess(segue: UIStoryboardSegue)
{
AlertManager.showTimedAlert(title: "Success", message: "New Product added", timeShowing: 1, callingUIViewController: self)
}
Function being called in AddProductView for registering the product:
private func registerProductAndPerformSegue(productToRegister prod: Product)
{
self.registerProduct(prodToRegister: prod)
Constants.logger.debug("New product registered")
self.performSegue(withIdentifier: "unwind_from_add_product_success", sender: self)
}
In the "Add Product View", after "Confirm" is clicked, an alert shows with "Are you sure?" and then you are prompt to click "Yes" or "No".
This is the code for the alert:
AlertManager.ShowAlert(controllerToShowAlert: self, alertTitle: LocalizationStrings.Products.ADD_PRODUCT_TITLE, alertText: LocalizationStrings.Products.ADD_PRODUCT_CONFIRMATION,
alertStyle: UIAlertControllerStyle.alert,
leftButtonAction: UIAlertAction(title: LocalizationStrings.YES_TEXT, style: .default, handler:
{
(action: UIAlertAction!) in
let user = Auth.auth().currentUser
if let user = user
{
let product : Product = Product(name: name!, price: Double(price!)!, currency: "USD", description: desc!,
location: "USA", ownerID: user.uid, ownerName: user.displayName!, uniqueID: "", mainImageURL: nil, category: category)
let storageRef = Storage.storage().reference().child(product.getUniqueID()).child("pic0.jpg")
if let mainChosenImage = self.selectedImageToUpload
{
Constants.logger.debug("Product picture chosen")
if let uploadData = UIImageJPEGRepresentation(mainChosenImage, 0.2)
{
storageRef.putData(uploadData, metadata: nil)
{
(StorageMetaData, error) in
if error != nil
{
Constants.logger.error("Add Product: Couldn't store image in database!")
return
}
self.mainImageURL = StorageMetaData?.downloadURL()?.absoluteString
if let urlString = self.mainImageURL
{
product.AddImageURLToProduct(URL: urlString)
self.registerProductAndPerformSegue(productToRegister: product)
}
}
}
else
{
Constants.logger.error("Couldn't convert uploaded image to UIImageJPEGRepresentation")
}
}
else
{
Constants.logger.debug("Product picture NOT chosen")
self.registerProductAndPerformSegue(productToRegister: product)
}
}
}),
rightButtonAction: UIAlertAction(title: LocalizationStrings.NO_TEXT, style: .cancel, handler: { (action: UIAlertAction!) in
print("Handle Cancel Logic here")
}))
What am I doing wrong here?

Answer 1

Without more details about your Storyboard setup and your code, it's hard to tell what the exact problem is.
But I'll assume that you have two view controllers and I will try to guide you through the steps to do an unwindSegue and you can check if you maybe have missed something.
Assuming that you have two view controllers: FirstViewController andAddProductViewController, andAddProductViewController` is presented using a push segue.
Inside FirstViewController you have:
#IBAction func unwindFromAddProductViewSuccess(segue: UIStoryboardSegue) {
AlertManager.showTimedAlert(title: "Success", message: "New Product added", timeShowing: 1, callingUIViewController: self)
}
Then, You connect your "save" or "add" button from AddProductViewController to unwindFromAddProductViewSuccess: action method.
You can also connect your "save" or "add" button to SecondViewController to debug that the segue is being called:
class SecondViewController: UIViewController {
#IBOutlet weak var saveButton: UIBarButtonItem!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let uiBarButtonItem = sender as? UIBarButtonItem else {
print("There is no UIBarButtonItem sender")
return
}
if saveButton == uiBarButtonItem {
print("save button tapped")
}
print("A segue with an identifier \(segue.identifier ?? "") was called.")
}
}
Assuming that you don' have a bar button item and want to call unwidnSegue manually, maybe after the user taps on an UIAlertController action, then you can do something like this:
#IBAction func orderButtonTapped(_ sender: UIButton) {
let alert = UIAlertController(title: "Order Placed!", message: "Thank you for your order.\nWe'll ship it to you soon!", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: {
(_)in
self.performSegue(withIdentifier: "unwindToMenu", sender: self)
})
alert.addAction(OKAction)
self.present(alert, animated: true, completion: nil)
}
There are also some cases when the UIViewController that you are trying to unwind from is at the bottom of the UINavigationController stack, in this case, calling unwindSegue will not do anything. There was a similar question related to that before, here.
I hope that this info can help you figure out the problem.