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请求更多的后台时间

发表于 2016-6-7 11:04:26 | 查看: 913| 回复: 5

监听程序进入后台

[[NSNotificationCenter defaultCenter] addObserver:self selectorselector(enterBack name:UIApplicationDidEnterBackgroundNotification object:[UIApplication sharedApplication]];

执行代码

-(void)enterBackNSNotification *)notification{
UIApplication *app=[UIApplication sharedApplication];
__bl<a href="https://www.bbs.webhostingtalk.cn/tag/oc/" title="查看更多关于oc的文章" target="_blank">oc</a>k UIBackgroundTaskIdentifier backTaskId;
backTaskId=[app beginBackgroundTaskWithExpirationHandler:^{
NSLog(@"＝＝＝＝在而外申请的10min内依然没有完成任务");
[app endBackgroundTask:backTaskId];
}];
if (backTaskId==UIBackgroundTaskInvalid) {
NSLog(@"不支持后台");
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
NSLog(@"－－－－－－在额外申请的10min内执行的任务");
[app endBackgroundTask:backTaskId];
});
}