我的委托没有将我的 JSON 值传递给视图控制器中的 UILabel

Question

我创建了一个委托，将 JSON 值传递给我的视图控制器，这样我就可以更改两个 UILabel，但是当我运行我的应用程序时，标签不会更改。我已经坚持了很长时间，当我使用选择器视图更改货币时，我所做的一切只会导致应用程序保持不变。帮助将不胜感激。谢谢。

代表

protocol coinManagerDelegate {
    func didUpdateCoin(price: String, currency: String)
    func didFailWithError(error: Error)
}

函数

   func performRequest(with Currency: String) {
        let stringURL = baseURL + Currency + apiKey
        AF.request(stringURL).responseJSON { response in
            switch response.result {
            case .success(let value):
                let json = JSON(value)
                if let rate = json["rate"].double {
                    print(rate)
                    let totalRate = String(format: "%.2f", rate)
                    print(totalRate)
                    self.delegate?.didUpdateCoin(price: totalRate, currency: Currency)
                }
                
                
                
            case .failure(let error):
                self.delegate?.didFailWithError(error: error)
            }
        }
    }

视图控制器

extension ViewController: coinManagerDelegate {
    func didFailWithError(error: Error) {
        print(error)
    }
    
    func didUpdateCoin(price: String, currency: String) {
        DispatchQueue.main.async {
            self.bitcoinLabel.text = price
            self.currencyLabel.text = currency
        }
    }
}

调用 performRequest

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let selectedCurrency = coinManager.currencyArray[row]
        coinManager.performRequest(with: selectedCurrency)
    }

Answer 1

您必须在 ViewController 中设置 delegate。

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    let selectedCurrency = coinManager.currencyArray[row]
    coinManager.delegate = self
    coinManager.performRequest(with: selectedCurrency)
}

我的委托没有将我的 JSON 值传递给视图控制器中的 UILabel

My delegate isn't passing my JSON value to the UILabel in the View Controller

json

delegates

ios

swift