[ios] Fix track recording points updates subscribe/unsubscribe

Signed-off-by: Kiryl Kaveryn <kirylkaveryn@gmail.com>

iphone/Maps/UI/PlacePage/PlacePageInteractor.swift

@@ -1,5 +1,6 @@
 protocol PlacePageInteractorProtocol: AnyObject {
   func viewWillAppear()
+  func viewWillDisappear()
   func updateTopBound(_ bound: CGFloat, duration: TimeInterval)
 }
 
@@ -19,12 +20,11 @@ class PlacePageInteractor: NSObject {
     self.mapViewController = mapViewController
     super.init()
     addToBookmarksManagerObserverList()
-    subscribeOnTrackActivePointUpdates()
+    subscribeOnTrackActivePointUpdatesIfNeeded()
   }
 
   deinit {
     removeFromBookmarksManagerObserverList()
-    unsubscribeFromTrackActivePointUpdates()
   }
 
   private func updatePlacePageIfNeeded() {
@@ -53,7 +53,8 @@ class PlacePageInteractor: NSObject {
     }
   }
 
-  private func subscribeOnTrackActivePointUpdates() {
+  private func subscribeOnTrackActivePointUpdatesIfNeeded() {
+    unsubscribeFromTrackActivePointUpdates()
     guard placePageData.objectType == .track, let trackData = placePageData.trackData else { return }
     bookmarksManager.setElevationActivePointChanged(trackData.trackId) { [weak self] distance in
       self?.trackActivePointPresenter?.updateActivePointDistance(distance)
@@ -65,7 +66,6 @@ class PlacePageInteractor: NSObject {
   }
 
   private func unsubscribeFromTrackActivePointUpdates() {
-    guard placePageData.trackData?.onActivePointChangedHandler != nil else { return }
     bookmarksManager.resetElevationActivePointChanged()
     bookmarksManager.resetElevationMyPositionChanged()
   }
@@ -89,6 +89,10 @@ extension PlacePageInteractor: PlacePageInteractorProtocol {
     updatePlacePageIfNeeded()
   }
 
+  func viewWillDisappear() {
+    unsubscribeFromTrackActivePointUpdates()
+  }
+
   func updateTopBound(_ bound: CGFloat, duration: TimeInterval) {
     mapViewController?.setPlacePageTopBound(bound, duration: duration)
   }

iphone/Maps/UI/PlacePage/PlacePageViewController.swift

@@ -79,6 +79,11 @@ final class PlacePageScrollView: UIScrollView {
     updatePreviewOffset()
   }
 
+  override func viewWillDisappear(_ animated: Bool) {
+    super.viewWillDisappear(animated)
+    interactor?.viewWillDisappear()
+  }
+
   override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
     super.traitCollectionDidChange(previousTraitCollection)
     // Update layout when the device was rotated but skip when the appearance was changed.