Question

我想在后台每半小时调用一次函数。

描述：我已经调用了一个函数 - (void)applicationDidEnterBackground:(UIApplication *)application方法。我需要在每半小时后重复一次这个功能。请帮我这样做。如果您需要任何细节，请告诉我。

Answer 1

当您的应用在function时，您无法运行任何background，直到您的应用支持这些 -

Apps that play audible content to the user while in the background, such as a music player app

Apps that keep users informed of their location at all times, such as a navigation app

Apps that support Voice over Internet Protocol (VoIP)

Newsstand apps that need to download and process new content

Apps that receive regular updates from external accessories

有关您可以在后台执行的操作以及如何操作的更多详细信息，请访问 -

http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

在xcode中每半小时后调用一个函数

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