UIApplicationBackgroundFetchIntervalMinimum 的实际值是多少？

Question

我要为 iOS 应用程序设置后台提取。

我愿意：

func application(
    application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?
    ) -> Bool {
        ...
        application.setMinimumBackgroundFetchInterval(
            UIApplicationBackgroundFetchIntervalMinimum)
        ...

如果我在调试器中检查并打印 UIApplicationBackgroundFetchIntervalMinimum，它会显示 0 - 实际值是多少？

我也尝试浏览 api 但没有成功 https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIApplication_Class/#//apple_ref/occ/instm/UIApplication/setMinimumBackgroundFetchInterval:

Answer 1

Apple 没有指定 UIApplicationBackgroundFetchIntervalMinimum 时间有多长，但实际上大约是 10 分钟。

UIApplicationBackgroundFetchIntervalMinimum 的实际值是多少？

What is actually the value of UIApplicationBackgroundFetchIntervalMinimum?

ios

ios7