Flutter 使用Future wait 实现并发请求

11 min read

To execute all futures concurrently, use Future.wait This takes a list of futures and returns a future of lists: Suppose you have these futures.
要同时执行所有future，请使用 Future.wait 这将获取一个future列表并返回一个future列表：假设你有这些未来。

class CovidAPI {
  Future<int> getCases() => Future.value(1000);
  Future<int> getRecovered() => Future.value(100);
  Future<int> getDeaths() => Future.value(10);
}

You can get all the futures together using Future.wait([list of futures])
您可以使用Future. wait（[list of futures]）将所有的期货集合在一起

final api = CovidAPI();
final values = await Future.wait([
    api.getCases(),
    api.getRecovered(),
    api.getDeaths(),
]);
print(values); // [1000, 100, 10]

This is ideal when the futures are independent, and they don't need to execute sequentially. Source : https://codewithandrea.com/videos/top-dart-tips-and-tricks-for-flutter-devs/
当future是独立的，并且它们不需要顺序执行时，这是理想的。来源： https://codewithandrea.com/videos/top-dart-tips-and-tricks-for-flutter-devs/