IOS_后台定时器

来源：互联网发布：云计算行业编辑：程序博客网时间：2024/04/29 09:13

 ////////////    //注入定时器    NSError *setCategoryErr = nil;    NSError *activationErr  = nil;    [[AVAudioSession sharedInstance]     setCategory: AVAudioSessionCategoryPlayback     error: &setCategoryErr];    [[AVAudioSession sharedInstance]     setActive: YES     error: &activationErr];

- (void)applicationDidEnterBackground:(UIApplication *)application{    //后台继续运行定时器    UIApplication*   app = [UIApplication sharedApplication];    __block    UIBackgroundTaskIdentifier bgTask;    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{        dispatch_async(dispatch_get_main_queue(), ^{            if (bgTask != UIBackgroundTaskInvalid)            {                bgTask = UIBackgroundTaskInvalid;            }        });    }];        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{        dispatch_async(dispatch_get_main_queue(), ^{            if (bgTask != UIBackgroundTaskInvalid)            {                bgTask = UIBackgroundTaskInvalid;            }        });    });}

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