Could you show your code (complete for PodcastViewCell, the UICollectionViewCell). I have been guessing some missing parts, it is not very efficient. How did you name the player there ? Sure it compiles with self instead of cell, but it misses the point which is to stop players from any other cell, not the current one (self).

Do you still get the error on line 93 ? If so, try the following: @IBAction func playPodcast(_ sender: Any) { if let collectionView = self.superview as? UICollectionView { let visibleCells = collectionView.visibleCells for cell in visibleCells { if let podCell = cell as? PodcastViewCell { print("cell is PodcastViewCell") if podCell.player != nil { print("podCell.player found") } else { print("podCell.player NOT found") } } else { print("cell is NOT PodcastViewCell") } } } And tell what you get exactly on console. Or simply change: if let collectionView = self.superview as? UICollectionView { let visibleCells = collectionView.visibleCells for cell in visibleCells where cell is PodcastViewCell { if (cell as! PodcastViewCell).player != nil { } }

@Shoko You should file a bug report. There is effectively a big need to improve this forum which does not provide the needed capabilities and creates useless constraints.

It is normal at first pass, because no player yet defined. Could you add another print: if url != "" { let playerItem = AVPlayerItem( url:NSURL( string:url )! as URL ) print("New player for", url) player = AVPlayer(playerItem:playerItem) player!.rate = 1.0;

It would help to know the exact error and the exact line where the error occurs. Where do you call purchase() ? public func purchase(product: Product, completion: @escaping () - Void) { guard SKPaymentQueue.canMakePayments() else { return } guard let storeKitProduct = products.first(where: { $0.productIdentifier == product.rawValue }) else { return } Utilities.purchaseFailed = Bool() let paymentRequest = SKPayment(product: storeKitProduct) SKPaymentQueue.default().add(self) SKPaymentQueue.default().add(paymentRequest) completion() } public func restore(completion: @escaping () - Void) { SKPaymentQueue.default().restoreCompletedTransactions() completion() } func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) { transactions.forEach({ transaction in switch transaction.transactionState { case .purchasing: //No op break case .purchased: handlePurchase(transaction.payment.productIdentifier) Utilities.purchaseFailed = false SKPaymentQueue.default().finishTransaction(transaction) break case .failed: Utilities.purchaseFailed = true Utilities.restoredPurchases = false SKPaymentQueue.default().finishTransaction(transaction) break case .restored: print("purchases restored") handlePurchase(transaction.payment.productIdentifier) Utilities.restoredPurchases = true SKPaymentQueue.default().finishTransaction(transaction) break case .deferred: break @unknown default: break } }) } private func handlePurchase(_ id: String) { UserDefaults.standard.setValue(true, forKey: id) print("id = \(id)") if id == "JokesRUs.RemoveAds" { Utilities.ShowAds = false } if id == "JokesRUs.Icons.Summer" { print("summer bought") IconChange.setIconPurchased = true IconChange.summerIconUnlocked = true IconChange.numUnlocked = IconChange.numUnlocked + 1 UserDefaults.standard.setValue(IconChange.numUnlocked + 1, forKey: "numUnlocked") UserDefaults.standard.setValue(true, forKey: "summerIconUnlocked") } if id == "JokesRUs.Icons.Taco" { print("taco bought") IconChange.setIconPurchased = true IconChange.tacoIconUnlocked = true IconChange.numUnlocked = IconChange.numUnlocked + 1 UserDefaults.standard.setValue(IconChange.numUnlocked + 1, forKey: "numUnlocked") UserDefaults.standard.setValue(true, forKey: "tacoIconUnlocked") } if id == "JokesRUs.Icons.Pizza" { print("pizza bought") IconChange.setIconPurchased = true IconChange.pizzaIconUnlocked = true IconChange.numUnlocked = IconChange.numUnlocked + 1 UserDefaults.standard.setValue(IconChange.numUnlocked + 1, forKey: "numUnlocked") UserDefaults.standard.setValue(true, forKey: "pizzaIconUnlocked") } if id == "JokesRUs.Icons.HotDog" { print("hotdog bought") IconChange.setIconPurchased = true IconChange.hotdogIconUnlocked = true IconChange.numUnlocked = IconChange.numUnlocked + 1 UserDefaults.standard.setValue(IconChange.numUnlocked + 1, forKey: "numUnlocked") UserDefaults.standard.setValue(true, forKey: "hotdogIconUnlocked") } if id == "JokesRUs.Icons.Hamburger" { print("hamburger bought") IconChange.setIconPurchased = true IconChange.hamburgerIconUnlocked = true IconChange.numUnlocked = IconChange.numUnlocked + 1 UserDefaults.standard.setValue(IconChange.numUnlocked + 1, forKey: "numUnlocked") UserDefaults.standard.setValue(true, forKey: "hamburgerIconUnlocked") } if id == "JokesRUs.Icons.Doughnut" { print("doughnut bought") IconChange.setIconPurchased = true IconChange.doughnutIconUnlocked = true IconChange.numUnlocked = IconChange.numUnlocked + 1 UserDefaults.standard.setValue(IconChange.numUnlocked + 1, forKey: "numUnlocked") UserDefaults.standard.setValue(true, forKey: "doughnutIconUnlocked") } }

Just repeat the answer from the other thread, to keep a reference here, before you close the thread: Did you set color and line width for the poly line ? You should do this in func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) - MKOverlayRenderer { if let routePolyline = overlay as? MKPolyline { let renderer = MKPolylineRenderer(polyline: routePolyline) renderer.strokeColor = UIColor.blue.cgColor renderer.lineWidth = 2 return renderer } return MKOverlayRenderer() } Get more details here: https://stackoverflow.com/questions/58013956/mapkit-draw-poly-line-from-coordinates-swift-5

Did you set color and line width for the poly line ? You should do this in func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) - MKOverlayRenderer { if let routePolyline = overlay as? MKPolyline { let renderer = MKPolylineRenderer(polyline: routePolyline) renderer.strokeColor = UIColor.blue.cgColor renderer.lineWidth = 2 return renderer } return MKOverlayRenderer() } Get more details here: https://stackoverflow.com/questions/58013956/mapkit-draw-poly-line-from-coordinates-swift-5

No need to redeclare. Here is the Apple example: @main struct MyApp: App { var body: some Scene { WindowGroup { ContentView() } #if os(macOS) Settings { SettingsView() } #endif } }

Look for the doc: https://developer.apple.com/documentation/storekit/in-app_purchase/offering_completing_and_restoring_in-app_purchases You will find sample code that explains how to properly use this.

Which version of Xcode ? Which version of MacOS ? AdvancedSettingsView is only available for MacOS 11.0 + It seems you copied this code: https://developer.apple.com/documentation/swiftui/settings?changes=l_3_7 But it is different: var body: some View { TabView { GeneralSettingsView() .tabItem { Label("General", systemImage: "gear") } .tag(Tabs.general) AdvancedSettingsView() .tabItem { Label("Advanced", systemImage: "star") } .tag(Tabs.advanced) } They do not show it, but they have to define struct AdvancedSettingsView: View { } as they defined struct GeneralSettingsView: View { }

At first glance, you have a thread issue. Where are you calling crystalAPIObjecta ? Maybe some handler should be declared @escaping, otherwise you call objects which have already disappeared. More code would be necessary to confirm.

the error appears in the App Delegate Do you mean that's where the crash shows ? That's not the initial cause, could you look at the crash report ?

OK, I missed it, you have effectively some cell with active player. It is surprising in the first run that you have 2 found, as none has yet been created What are exactly the cells you hit ? Could you add yet another print: @IBAction func playPodcast(_ sender: Any) { print("Title", self.title) if let collectionView = self.superview as? UICollectionView { let visibleCells = collectionView.visibleCells There is also a case cell is NOT PodcastViewCell What cell is this ?

In the crash report, can you follow the track to see where exactly ? Is it inside setUpContactsCollectionView ? You can also track step by step in debugger to see where it crashes. Or add several prints in setUpContactsCollectionView, to see which is the last to print. Could you also show the full class, to understand better the context.

With the present code:   let data = ["Aluminum 100", "Aluminum 80", "Aluminum 63", "Aluminum 50", "Steel 120", "Steel 100", "Steel 72"] when you test:     if data == ["Aluminum 100"]{ you test in fact:     if ["Aluminum 100", "Aluminum 80", "Aluminum 63", "Aluminum 50", "Steel 120", "Steel 100", "Steel 72"] == ["Aluminum 100"]{ So that is false. OOPer explained how to solve. Note that you can streamline your formulas: consumptionAir = (Double(plannedDepth.text!) + 33) / 33 * 1.4 But you need to make it more robust: if text is empty or nil, you'll crash let depthText = plannedDepth.text ?? "0" // Handle nil textField let value = depthText == "" ? 0.0 : (Double(depthText) ?? 0.0) // Handle empty textField: value is zero ; and if text is not a num (eg: "abcd", also zero consumptionAir = (value + 33) / 33 * 1.4 // No more risk of crash For timeOutput.text, you should at least show the unit and better convert to hours and minutes.