ios后台运行程序-优快云博客

本文详细介绍了如何在iOS应用中执行后台任务并设置本地通知的方法，包括使用beginBackgroundTaskWithExpirationHandler来释放共享资源和保存用户数据，以及如何通过scheduleAlarmForDate来触发定时通知。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

http://blog.youkuaiyun.com/csharpjasp/article/details/6833343

1.运行逻辑代码:

-(void)execBackrgoundMethod

{
    /*
     Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
     If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
     */
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
     [app endBackgroundTask:bgTask];
     bgTask = UIBackgroundTaskInvalid;
     }];
// Start the long-running task and return immediately.
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,
     0), ^{

//在这里写你要在后运行行的代码

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

2.后台弹出UILocalNotification:

- (void)scheduleAlarmForDate:(NSDate*)theDate
{
//theDate延迟多长时间弹出
     UIApplication* app = [UIApplication sharedApplication];
     NSArray* oldNotifications = [app scheduledLocalNotifications];
     // Clear out the old notification before scheduling a new one.
     if ([oldNotifications count] > 0)
     [app cancelAllLocalNotifications];
     // Create a new notification.
     UILocalNotification* alarm = [[[UILocalNotification alloc] init] autorelease];
     if (alarm)
     {
     alarm.fireDate = theDate;
     alarm.timeZone = [NSTimeZone defaultTimeZone];
     alarm.repeatInterval = 0;
     alarm.soundName = @"alarmsound.caf";
     alarm.alertBody = @"Time to wake up!";
     [app scheduleLocalNotification:alarm];
     }
}