Swift中的多个pickerview didSelectRow错误

Question

我有 2 个选择器视图，1 个选择器视图用于从数组中选择一种加密货币，另一个选择器视图用于从数组中选择一种货币。我遇到的问题是，当我在模拟器上运行应用程序并在 cryptoPicker 中选择加密货币时，该应用程序还会从 currencyPicker 中选择相同的数组值，反之亦然。除非用户选择，否则我不希望从两个数组中提取 0 的数组值。

@IBOutlet weak var cryptoCurrentRate: UILabel!
@IBOutlet weak var currencyLabel: UILabel!
@IBOutlet weak var currencyPicker: UIPickerView!
@IBOutlet weak var cryptoPicker: UIPickerView!
@IBOutlet weak var cryptoLabel: UILabel!


var coinManager = CoinManager()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    coinManager.delegate = self
    currencyPicker.dataSource = self
    currencyPicker.delegate = self
    cryptoPicker.dataSource = self
    cryptoPicker.delegate = self   

}

}

func numberOfComponents(in pickerView: UIPickerView) -> Int {
       return 1
   }


    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if pickerView == currencyPicker {
        return coinManager.currencyArray.count
        }
        if pickerView == cryptoPicker {
        return coinManager.cryptoArray.count
    }
        return 0
    }
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if pickerView == currencyPicker {
        return coinManager.currencyArray[row]
        }
        if pickerView == cryptoPicker {
        return coinManager.cryptoArray[row]
    }
        return ""
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let selectedCurrency = coinManager.currencyArray[row]
        let selectedCrypto = coinManager.cryptoArray[row]
        coinManager.fetchCryptoCoin(assetIdBase: selectedCrypto, assetIdQuote: selectedCurrency)
    }

}

Answer 1

对picker和'didSelectRow'做同样的检查，你可以这样做：

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
     var selectedCurrency: CurrencyModel? = nil
     var selectedCrypt: CryptModel? = nil


    if pickerView == currencyPicker {
        selectedCurrency = coinManager.currencyArray[row]
    }
    if pickerView == cryptoPicker {
        selectedCrypto = coinManager.cryptoArray[row]
    }

    coinManager.fetchCryptoCoin(assetIdBase: selectedCrypt == nil ? coinManager.cryptoArray[.zero] : selectedCrypt!, assetIdQuote: selectedCurrency == nil ? coinManager.currencyArray[.zero] : selectedCurrency!)
}

默认情况下，它会从 'coinManager.currencyArray' 或 'coinManager.cryptoArray' 中获取第一个值