SwiftUI - How you can pop to specific view in SwiftUI? - ios

Question

Is there some way to implement popToViewController(vc) equivalent in SwiftUI? For example if I have the following flow:
View1 -> View2 -> View3 -> View4
How can I pop from View4 directly to View2 considering that we do not have control over the navigation stack ?

Answer 1

Hello **#Milen Valchev**, I'm new to SwiftUI. As I'm doing R&D on some functionaities with SwiftUI. I'm facing issue with PopToSpecific View. After R&D I got something. You can use this for PopToSpecific View.
**1. First you've to create a extension for UINavigationController. check this below mentioned code**
import UIKit
extension UINavigationController {
func popToViewController(ofClass: AnyClass, animated: Bool = true) {
if let vc = viewControllers.filter({$0.isKind(of: ofClass)}).last {
popToViewController(vc, animated: animated)
}
}
func popViewControllers(viewsToPop: Int, animated: Bool = true) {
if viewControllers.count > viewsToPop {
let vc = viewControllers[viewControllers.count - viewsToPop - 1]
popToViewController(vc, animated: animated)
}
}
func popBack<T: UIViewController>(toControllerType: T.Type) {
if var viewControllers: [UIViewController] = self.navigationController?.viewControllers {
viewControllers = viewControllers.reversed()
for currentViewController in viewControllers {
if currentViewController .isKind(of: toControllerType) {
self.navigationController?.popToViewController(currentViewController, animated: true)
break
}
}
}
}
}
**2. After creating UINavigationController extension you've to get UINavigationController instance by using this code.**
let window = UIApplication.shared.connectedScenes
.filter { $0.activationState == .foregroundActive }
.map { $0 as? UIWindowScene }
.compactMap { $0 }
.first?.windows
.filter { $0.isKeyWindow }
.first
let navigation = window?.rootViewController?.children.first as? UINavigationController
**Note:- Once you get the UINavigationController instance you can easily PopToSpecific View.**
You can use this code.
navigation.popViewControllers(viewsToPop: 2)
Hopefully it'll help you.

Answer 2

Make it Simple!!
Add an extension to the UINavigationController
extension UINavigationController {
func popToViewController(ofClass: AnyClass, animated: Bool = true) {
if let vc = viewControllers.last(where: { $0.isKind(of: ofClass) }) {
popToViewController(vc, animated: animated)
}
}
Add below code to go specific SwiftUI View. You have to mention SampleView place to your view.
navigationController.popToViewController(ofClass: HostingController<SampleView>.self)
That's it!

Answer 3

// Do not change, it must be same with NavigationBarTitle
enum ViewIdentifiers: String {
case homeView = "Home"
case detailView = "Detail Page"
}
struct HomeView: View {
var body: some View {
VStack {
NavigationLink {
DetailView()
} label: {
Text("Go To Detail")
}
}
.navigationBarTitle(ViewIdentifiers.homeView.rawValue, displayMode: .inline)
}
}
struct DetailView: View {
var body: some View {
VStack {
Text("Detail")
.onTapGesture { UIApplication.shared.popToView(ViewIdentifiers.homeView) }
}
.navigationBarTitle("Detail Page", displayMode: .inline)
}
}
extension UIApplication {
var keyWindow: UIWindow? {
return UIApplication.shared.connectedScenes
.filter { $0.activationState == .foregroundActive }
.first(where: { $0 is UIWindowScene })
.flatMap({ $0 as? UIWindowScene })?.windows
.first(where: \.isKeyWindow)
}
func getNavigationController() -> UINavigationController? {
guard let window = keyWindow else { return nil }
guard let rootViewController = window.rootViewController else { return nil }
guard let navigationController = findNavigationController(viewController: rootViewController) else { return nil }
return navigationController
}
private func findNavigationController(viewController: UIViewController?) -> UINavigationController? {
guard let viewController = viewController else {
return nil
}
if let navigationController = viewController as? UINavigationController {
return navigationController
}
for childViewController in viewController.children {
return findNavigationController(viewController: childViewController)
}
return nil
}
func popToView(_ identifier: ViewIdentifiers) {
guard let navigationController = getNavigationController() else {
return
}
for vc in navigationController.children {
if vc.navigationItem.title == identifier.rawValue {
navigationController.popToViewController(vc, animated: true)
break
}
}
}
}