objective-c – IOS 7后台获取

我需要它每秒5秒在后台执行的功能,但是我在google中看到的代码,SO决定何时应该调用该函数.

我希望它每5秒执行一次这个函数.

我的代码在这里：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.

[[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum];
return YES;
}