Dynamically assign ViewController to Navigate - ios

Question

In my case I have UITableView and have View all button for the listing of all the items in separate screens. So I added target for UIButton action method in cellForRowAt. Now what I am doing in action method:
#IBAction func btnViewAllOffer(_ sender: UIButton) {
let buttonPosition = sender.convert(CGPoint.zero, to: self.tblOfferView)
let indexPath = self.tblOfferView.indexPathForRow(at: buttonPosition)
if indexPath != nil {
if let type = self.homeData[indexPath!.section].type {
if type == HomeDataType.SponserProduct.rawValue {
let vc1 = self.storyboard?.instantiateViewController(withIdentifier: "ViewController1") as! ViewController1
if let title = self.homeData[indexPath!.section].title {
vc1.title = title
}
self.navigationController?.pushViewController(vc1, animated: true)
} else if type == HomeDataType.Offer.rawValue {
let vc2 = self.storyboard?.instantiateViewController(withIdentifier: "ViewController2") as! ViewController2
if let title = self.homeData[indexPath!.section].title {
vc2.title = title
}
self.navigationController?.pushViewController(vc2, animated: true)
} else if type == HomeDataType.BestSeller.rawValue {
let vc3 = self.storyboard?.instantiateViewController(withIdentifier: "ViewController3") as! ViewController3
if let title = self.homeData[indexPath!.section].title {
vc3.title = title
}
self.navigationController?.pushViewController(vc3, animated: true)
}
}
}
}
What I need, is there any way I can minimize the code and assign viewcontrollers dynamically so there is no need to instantiate each view controller and push them everytime?
Something like:
var vc = UIViewController()
if let type = self.homeData[indexPath!.section].type {
if type == HomeDataType.SponserProduct.rawValue {
vc = ViewController1()
}
else if type == HomeDataType.Offer.rawValue {
vc = ViewController2()
} else if type == HomeDataType.BestSeller.rawValue {
vc = ViewController3()
}
}
self.navigationController?.pushViewController(vc, animated: true)

Answer 1

Use a protocol (SimilarViewController) to define the common properties like title:
protocol SimilarViewController {
var title: String? { get set }
}
class ViewController1: UIViewController, SimilarViewController {
var title: String?
}
class ViewController2: UIViewController, SimilarViewController {
var title: String?
}
class ViewController3: UIViewController, SimilarViewController {
var title: String?
}
#IBAction func btnViewAllOffer(_ sender: UIButton) {
let buttonPosition = sender.convert(CGPoint.zero, to: self.tblOfferView)
let indexPath = self.tblOfferView.indexPathForRow(at: buttonPosition)
if indexPath != nil {
if let type = self.homeData[indexPath!.section].type {
var vcGeneric: SimilarViewController?
if type == HomeDataType.SponserProduct.rawValue {
vcGeneric = self.storyboard?.instantiateViewController(withIdentifier: "ViewController1") as! ViewController1
} else if type == HomeDataType.Offer.rawValue {
vcGeneric = self.storyboard?.instantiateViewController(withIdentifier: "ViewController2") as! ViewController2
} else if type == HomeDataType.BestSeller.rawValue {
vcGeneric = self.storyboard?.instantiateViewController(withIdentifier: "ViewController3") as! ViewController3
}
if let title = self.homeData[indexPath!.section].title {
vcGeneric?.title = title
}
if let vcGeneric = vcGeneric as? UIViewController {
self.navigationController?.pushViewController(vcGeneric, animated: true)
}
}
}
}

Answer 2

1: create a struct and assign the value to it.
struct TitleDetails {
static var title : String = ""
}
2: create an extension of viewController and use it to avoid code repetition.
extension UIViewController {
func pushVC(_ vcName : String) {
let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: vcname)
self.navigationController?.pushViewController(vc, animated: true)
}
}
3: now you can call it directly as,
TitleDetails.title = yourTitleValue
self.pushVC("ViewController1")
and in your ViewDidLoad() method of your destination view controller,
self.title = TitleDetails.title

Answer 3

Create BaseViewController and derived other ViewController from BaseViewController
class BaseViewController: UIViewController {
var viewTitle = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func pushVC(_ vcName : String) {
let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: vcName)
self.navigationController?.pushViewController(vc, animated: true)
}
}
And use below code on ViewController you need like:
#IBAction func btnViewAllOffer(_ sender: UIButton) {
let buttonPosition = sender.convert(CGPoint.zero, to: self.tblOfferView)
let indexPath = self.tblOfferView.indexPathForRow(at: buttonPosition)
if indexPath != nil {
if let type = self.homeData[indexPath!.section].type {
self.viewTitle = self.homeData[indexPath!.section].title
if type == HomeDataType.SponserProduct.rawValue {
self.pushVC("ViewController1")
} else if type == HomeDataType.Offer.rawValue {
self.pushVC("ViewController2")
} else if type == HomeDataType.BestSeller.rawValue {
self.pushVC("ViewController3")
}
}
}
}