How to reload ViewController from another class?

Question

I want to reload my ViewController after a successful purchase. But how to do it from purchase class. How to reload ViewController from another class?

class IAPObserver: NSObject, SKPaymentTransactionObserver {

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            switch transaction.transactionState {
                case .purchasing:
                    break
                
                case .purchased:
                    delegate?.purchaseStatusDidUpdate(PurchaseStatus.init(state: .complete, error: nil, transaction: transaction, message:"Purchase Complete."))
                    SKPaymentQueue.default().finishTransaction(transaction)

                    // code to reload my ViewController

                case .failed:

                    delegate?.purchaseStatusDidUpdate(PurchaseStatus.init(state: .failed, error: transaction.error, transaction: transaction, message:"An error occured."))
                    SKPaymentQueue.default().finishTransaction(transaction)
                
                case .restored:

                    delegate?.restoreStatusDidUpdate(PurchaseStatus.init(state: .complete, error: nil, transaction: transaction, message:"Restore Success!"))
                    SKPaymentQueue.default().finishTransaction(transaction)
                    
                case .deferred:

                    break
            }
        }
    }

Answer 1

You must call reloadData() in self, the view controller that manages the table view. Luckily, you can use notification to achieve calling the relevant function from another class. In the view controller

override func viewDidLoad() {
        super.viewDidLoad()
        ...
        NotificationCenter.default.addObserver(self, selector: #selector(reloadTableViewData), name: NSNotification.Name(rawValue: "reloadData"), object: nil)
    }

@objc func reloadTableViewData() {
        tableView.reloadData()
    }

In your class IAPObserver, use the following to notify that you now want to reload data:

NotificationCenter.default.post(name: NSNotification.Name(rawValue: "reloadData"), object: nil)