我在想最好的办法来处理这件事我目前正在寻找等待，直到用户停止输入（让我们说延迟3秒）之前，运行一些代码。最初我打算使用textFieldDidEndEditing，但正如我们所知，它只在用户返回时执行，而不是在他们停止输入时执行。
目前我使用@IBAction textFieldEditingChanged，但这将执行每个输入字符/数字的代码。我尝试使用像shouldExecuteCode: Bool这样的变量，但由于我解析的是XML，响应几乎是立即的，代码仍然会执行几次。
我在考虑使用某种OperationQueue，只有一个操作或没有并发。
有人有好主意吗？

当前实施情况

@IBAction func textFieldEditingChanged(_ sender: CurrencyTextField) {
        self.viewModel.currentTextFieldIdentifier = sender.textFieldIdentifier
        DispatchQueue.main.asyncAfter(deadline: .now() + viewModel.calculationDelay) {
            if let text = sender.text,
               let value = String.format(text) {
                switch self.viewModel.currentTextFieldIdentifier {
                case .fromCurrency:
                    self.calculateExchange(value: value,
                                           valueCurrency: self.fromCurrencyTextField.currency,
                                           outputCurrency: self.toCurrencyTextField.currency)
                case .toCurrency:
                    self.calculateExchange(value: value,
                                           valueCurrency: self.toCurrencyTextField.currency,
                                           outputCurrency: self.fromCurrencyTextField.currency)
                }
            }
        }
    }

可能实施

NotificationCenter.default
            .publisher(for: UITextField.textDidChangeNotification, object: sender)
            .map({ ($0.object as? UITextField)?.text ?? "" })
            .debounce(for: .milliseconds(500), scheduler: RunLoop.main)
            .sink { [weak self] text in
                guard let self = self  else { return }
                if let value = String.format(text) {
                    print(value)
                    switch self.viewModel.currencyTextFieldIdentifier {
                    case .fromCurrency:
                        self.calculateExchange(value: value,
                                               valueCurrency: self.fromCurrencyTextField.currency,
                                               outputCurrency: self.toCurrencyTextField.currency)
                    case .toCurrency:
                        self.calculateExchange(value: value,
                                               valueCurrency: self.toCurrencyTextField.currency,
                                               outputCurrency: self.fromCurrencyTextField.currency)
                    }
                }
            }
            .store(in: &subscriptions)