How to dismiss swiftUI from Viewcontroller? - swiftui

Question

In my an viewController I have this function
...{
let vc = UIHostingController(rootView: SwiftUIView())
present(vc, animated: true, completion: nil)
}
Which present the following SwiftUIView.
Q How to dismiss the SwiftUIView when CustomButton pressed?
struct SwiftUIView : View {
var body: some View {
CustomButton()
}
}
struct CustomButton: View {
var body: some View {
Button(action: {
self.buttonAction()
}) {
Text(buttonTitle)
}
}
func buttonAction() {
//dismiss the SwiftUIView when this button pressed
}
}

Answer 1

struct CustomButton: View {
var body: some View {
Button(action: {
self.buttonAction()
}) {
Text(buttonTitle)
}
}
func buttonAction() {
if let topController = UIApplication.topViewController() {
topController.dismiss(animated: true)
}
}
}
extension UIApplication {
class func topViewController(controller: UIViewController? = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController) -> UIViewController? {
if let navigationController = controller as? UINavigationController {
return topViewController(controller: navigationController.visibleViewController)
}
if let tabController = controller as? UITabBarController {
if let selected = tabController.selectedViewController {
return topViewController(controller: selected)
}
}
if let presented = controller?.presentedViewController {
return topViewController(controller: presented)
}
return controller
}
}
Or if this doesn't work because you have a different view controller on top or if you need to use view life cycle events (onDisappear and onAppear won't work with UIHostingController).
You can use instead:
final class SwiftUIViewController: UIHostingController<CustomButton> {
required init?(coder: NSCoder) {
super.init(coder: coder, rootView: CustomButton())
rootView.dismiss = dismiss
}
init() {
super.init(rootView: CustomButton())
rootView.dismiss = dismiss
}
func dismiss() {
dismiss(animated: true, completion: nil)
}
override func viewWillDisappear(_ animated: Bool) {
rootView.prepareExit()
}
override func viewDidDisappear(_ animated: Bool) {
rootView.doExit()
}
}
struct CustomButton: View {
var dismiss: (() -> Void)?
var body: some View {
Button(action: dismiss! ) {
Text("Dismiss")
}
}
func prepareExit() {
// code to execute on viewWillDisappear
}
func doExit() {
// code to execute on viewDidDisappear
}
}