Question

我正在开发一个应用，我希望每小时进行一次网络通话（同步目的）。即使应用程序处于终止状态。我怎样才能做到这一点？

任何地方都没有涉及UI更新，我只需要更新本地数据库和云存储文件。

Answer 1

-(void)applicationDidEnterBackground:(UIApplication *)application
{
    bgTask = [application beginBackgroundTaskWithName:@"MyTask" expirationHandler:^{
        // Clean up any unfinished task business by marking where you
        // stopped or ending the task outright.
        [application endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    }];

    // Start the long-running task and return immediately.
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        // Do the work associated with the task, preferably in chunks.

        [application endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    });
}

Answer 2

if([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)])
{
    __block UIBackgroundTaskIdentifier background_task;
    background_task = [application beginBackgroundTaskWithExpirationHandler:^ {
        [application endBackgroundTask: background_task];
        background_task = UIBackgroundTaskInvalid;
    }];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        while(YES)
        { 

            [NSThread sleepForTimeInterval:your_sleep_time];

        }
    });
}
else
{
    NSLog(@"Multitasking Not Supported");
}

我们已经创建了一个新的后台任务并为其添加了一个新线程，因此您可以自由地睡眠线程:) 我希望我能帮到你

后台定时任务iOS

2 个答案: