Push UIViewController with Alert without UINavigationController - swift

Question

I have a button in UITableViewController. when I press this button, alert controller appears asks if the user wants to go to the cart page or stay in the same page, as follows,
if user?.uid != nil{
let title = "Item is added to your cart "
let alert = AlertController.instance(title: title)
present(alert, animated: true, completion: nil)
} else{
// Alert asks user to register..
}
AlertController is in different class and I created it with custom animation.
I want when user press (go to cart page) button, the cart page is displayed as if it was as (show,"push") segue.
This is how I pushed the view controller programmatically in alert controller class.
#IBAction func showCartButton(_ sender: Any) {
//---> go to cart page ...
print("cart button pressed")
//-----> this code is working fine with other UIviewcontrollers (however it is 'not working in UItableviewcontroller)
let storyBoard : UIStoryboard = UIStoryboard(name: "Cart", bundle:nil)
let CartViewController = storyBoard.instantiateViewController(withIdentifier: "CartPage")
navigationController?.pushViewController(CartViewController, animated: true)
//-----> this code shows the cart page without the navigation and tabs..
// let storyBoard : UIStoryboard = UIStoryboard(name: "Cart", bundle:nil)
// let CartViewController = storyBoard.instantiateViewController(withIdentifier: "CartPage")
// self.present(CartViewController, animated:true, completion:nil)
}
The push view controller is not working with Alert controller, I am not sure if it is because I used the navigation with the alert, and if so, is there a way I can push the view controller??
This is the whole AlertController Class I created in seperate storyboard and put it as initial view controller..
import UIKit
class AlertController: UIViewController{
#IBOutlet weak fileprivate var AddProductToCartLabel: UILabel!
#IBOutlet weak fileprivate var cartButton: UIButton!
#IBOutlet weak fileprivate var shoppingButton: UIButton!
#IBOutlet weak fileprivate var container: UIView!
var text = String()
override func viewDidLoad() {
setContainer()
setCartButton()
setShoppingButton()
}
override func viewDidLayoutSubviews() {
layoutContainer()
}
#IBAction func cancel(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
#IBAction func showCartButton(_ sender: Any) {
//---> go to cart page ...
print("cart button pressed")
let storyBoard : UIStoryboard = UIStoryboard(name: "Cart", bundle:nil)
let CartViewController = storyBoard.instantiateViewController(withIdentifier: "CartPage")
navigationController?.pushViewController(CartViewController, animated: true)
// let storyBoard : UIStoryboard = UIStoryboard(name: "Cart", bundle:nil)
// let CartViewController = storyBoard.instantiateViewController(withIdentifier: "CartPage")
// self.present(CartViewController, animated:true, completion:nil)
}
#IBAction func completeShopButton(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
}
fileprivate extension AlertController{
// to set the view above
func setContainer() {
let shape = CAShapeLayer()
shape.fillColor = UIColor.white.cgColor
container.backgroundColor = UIColor.clear
container.layer.insertSublayer(shape, at: 0)
}
func setCartButton(){
cartButton.clipsToBounds = true
//cartButton.layer.cornerRadius = 10
}
func setShoppingButton(){
shoppingButton.clipsToBounds = true
shoppingButton.layer.borderColor = UIColor.darkGray.cgColor
shoppingButton.layer.borderWidth = 1
//shoppingButton.layer.cornerRadius = 10
}
}
fileprivate extension AlertController{
// design the size of the container
func layoutContainer() {
let path = UIBezierPath(roundedRect: container.bounds, cornerRadius: 10)
let layer = container.layer.sublayers?.first as! CAShapeLayer
layer.path = path.cgPath
}
}
extension AlertController{
static func instance(title: String?) -> AlertController{
let storyboard = UIStoryboard(name: String(describing: self), bundle: Bundle(for: self))
let controller = storyboard.instantiateInitialViewController() as! AlertController
controller.text = title!
return controller
}
}

Answer 1

The problem is that when you try to push CartViewController, there is no navigation controller to push it on.
You present AlertController modally, and then try to do:
navigationController?.pushViewController(CartViewController, animated: true). If you put a breakpoint here and print out navigationController, I expect it is nil.
I suggest you have AlertController delegate back to your UITableViewController that is inside a navigation controller, and have the tableview controller push to the next screen. You could also present AlertController inside of a navigation view, but this seems unnecessary.