iOS小demo之无限后台

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首先需要配置Info-Plist文件,在里面新建一个Required background modes。这个是一个数组,在下面添加如下内容:

App provides Voice over IP services(VOIP)

App plays audio or streams audio/video using AirPlay(audio)

App processes Newsstand Kit downloads(newsstand-content)

App communicates using CoreBluetooth(bluetooth-central

App shares data using CoreBluetooth(bluetooth-peripheral

App registers for location updates(location)

添加完成后,在- (void)applicationDidEnterBackground:(UIApplication *)application里面添加如下代码

Long Running Background Task Plist

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    <key>UIBackgroundModes</key>
    <array>
        <string>location</string>
        <string>voip</string>
        <string>audio</string>
        <string>newsstand-content</string>
        <string>bluetooth-central</string>
        <string>bluetooth-peripheral</string>
    </array>


添加完成后,在- (void)applicationDidEnterBackground:(UIApplication *)application里面添加如下代码


  1. __block UIBackgroundTaskIdentifier background_task;  
  2.       
  3.     background_task = [application beginBackgroundTaskWithExpirationHandler:^ {  
  4.         [application endBackgroundTask: background_task];  
  5.         background_task = UIBackgroundTaskInvalid;  
  6.     }];  
  7.       
  8.     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  
  9.     while(TRUE)  
  10.         {  
  11.             [NSThread sleepForTimeInterval:1];  
  12.               
  13.              //编写执行任务代码  
  14.   
  15.         }  
  16.           
  17.         [application endBackgroundTask: background_task];  
  18.         background_task = UIBackgroundTaskInvalid;  
  19.     });  

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