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对不起我的愚蠢问题,但我不明白如何在ios7中调用背景抓取。这里是代码:后台抓取只执行一次ios7
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[application setMinimumBackgroundFetchInterval:20];
return YES;
}
-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
NSLog(@"Fetch called");
completionHandler(UIBackgroundFetchResultNoData);
[UIApplication sharedApplication].applicationIconBadgeNumber += 1;
}
问题是我已经设置间隔为20秒,但它只执行一次。这种行为看起来很奇怪。也许我错了,背景获取的模拟只在默认情况下执行一次,但在真实设备上它会定期执行。我怎样才能确定它会每隔20秒被调用一次?请帮忙!