什么是UIApplicationBackgroundFetchIntervalMinimum的值？

Question

我是关于为iOS应用程序设置后台提取.

我做:

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

如果我UIApplicationBackgroundFetchIntervalMinimum在调试器中检查和打印它说0- 实际值是多少？

我也尝试通过api查看,但没有运气https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIApplication_Class/#//apple_ref/occ/instm/UIApplication/setMinimumBackgroundFetchInterval:

Answer 1

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