您如何在非异步函数中获取异步操作的值？

Question

所以我有这个显示股票价格的小工具。我使用HTTP调用来获取股票价格，当然此功能是异步的，并且在主体中，我等待网络服务完成后再返回股票价格。但是，每次我尝试打印此股票价格时，它都说这是一个未来，但我不知道如何拆封它？我已经在网络通话中等待着，所以不应该拆封它并让我获得真正的价值吗？

StockService stockService = new StockService();
           var stockPrice = stockService.getStockPriceBySymbol(symbols.elementAt(x));
           print(stockPrice);

NetworkServices：

Future<dynamic> getStockPriceBySymbol(String symbol) async {
    NetworkService networkService = NetworkService(
        '$alphaStockApiURL?function=GLOBAL_QUOTE&symbol=$symbol&apikey=$kAlphaStockAPIKey');

    var stockData = await networkService.getData();
    // print(stockData['Global Quote']['05. price']);
    return stockData['Global Quote']['05. price'];
  }

Answer 1

您需要等待stockService.getStockPriceBySymbol

var stockPrice = await stockService.getStockPriceBySymbol(symbols.elementAt(x));

或将来的.then

stockService.getStockPriceBySymbol(symbols.elementAt(x)).then((stockPrice){
  print(stockPrice);
)};