swift - 在 firestore 上自动更新的计时器

Question

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Answer 1

当您的应用程序关闭时，您将无法与您的代码进行交互。 iOS 是严格的，一旦您的应用关闭，您有 30 秒的时间来处理任何必要的事情。您的应用已暂停常规事件，

正如@matt 提到的:

A timer can run in the background only if both the following are true:

Your app for some other reason runs in the background. (Most apps don't; most apps are suspended when they go into the background.) And: The timer was running already when the app went into the background.

我还建议看这里: Swift 3 - How to make timer work in background