iOS程序进入后台后仍运行定时器NSTimer
由于本应用需要在应用进入后台后还要进行定时的检测功能,因此对于我来说怎样让APP在进入后台后 保持运行状态是比较大的需求。然后在iOS系统中是很难实现的,不管是 通过 音频还是 定位系统,我查找了一些资料后都是只能申请到十分钟的运行态。没有所谓的长期运行的概念。。。。。
然而在博客中突然看到这篇文章,尝试了下竟然可以运行很久。不管怎么样我还是先试试了......至于苹果是否能审核通过估计又是个难是
具体如下:
本文所讲为其中之一:iOS程序进入后台后十分钟之内就会被系统kill掉,怎么解决呢?我想要程序进入后台后仍然运行计时功能,否则就无法达到考试的目的,之后在网上查阅了相关资料最后终于找到答案,其精髓就是:利用苹果给出的三种类型的程序可以保持在后台运行:音频播放类,位置更新类,另外一个记不太清楚了,我利用了苹果给出的音频播放类的这个“特权”来满足我程序上的要求,详细步骤如下:
1、步骤一:在Info.plist中,添加"Required background modes"键,value为:App plays audio
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" alt="" />
步骤二:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
NSError *setCategoryErr = nil;
NSError *activationErr = nil;
[[AVAudioSession sharedInstance]
setCategory: AVAudioSessionCategoryPlayback
error: &setCategoryErr];
[[AVAudioSession sharedInstance]
setActive: YES
error: &activationErr];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
步骤三:将以下代码添加到appDelegate文件中的- (void)applicationDidEnterBackground:(UIApplication *)application函数,也可添加到在具体类中注册的应用进入后台后的通知方法
- (void)applicationDidEnterBackground:(UIApplication *)application{ 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;
}
});
});
}
完成以上步骤你会发现,程序进入后台后仍可运行定时器!
感谢 http://www.cnblogs.com/zzltjnh/archive/2013/05/15/3080058.html ! 希望我这里有用
以后也要仔细看下苹果的官方文档......
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