1，voip方式
1）首先要修改应用的plist配置，添加下面的设置：
Application does not run in background: NO
Required background modes: VOIP
注：添加这些配置之后，程序重启解锁就会自动运行application:
didFinishLaunchingWithOptions方法。
2）主要测试代码：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
__block UIBackgroundTaskIdentifier background_task;
background_task = [application beginBackgroundTaskWithExpirationHandler:^ {
//打开后台运行任务
}];
static dispatch_queue_t _queue ;
_queue = dispatch_queue_create("sddfgfgwerty456567fre4ghghkjdsfbnjfrtyrt", DISPATCH_QUEUE_SERIAL);
dispatch_async(_queue, ^{
while(TRUE)
{
//打印进程id
NSLog(@"processID = %d++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++CurrentThread = %@",[SSProcessInfo processID],[[NSThread currentThread] description]);
[NSThread sleepForTimeInterval: 5]; //wait for 15 min
}
});
sleep(1);
return YES;
}
注：程序测试必须真机下，观察log信息用Xcode上自带的Organizer工具。
经过分析log信息，发现processID过一段时间就会变，说明程序运行一段时间就会被kill掉，然后程序会自动重启。虽然达到了持续运行的目的，但是不符合程序持续运行要求。
2，GPS方式
1）首先要修改应用的plist配置，添加下面的设置：
Application does not run in background: NO
Required background modes: App registers for location updates
添加这两项之后可以保证程序在后台运行
2）主要测试代码：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
if ([CLLocationManager significantLocationChangeMonitoringAvailable])
{
[self.locationManager startUpdatingLocation];
}
else
{
NSLog(@"Significant location change monitoring is not available.");
}
return YES;
}
- (CLLocationManager *)locationManager
{
if (_locationManager == nil) {
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
if([CLLocationManager locationServicesEnabled])
{
NSLog(@"无限运行................................................");
//这个分支进入后台后，运行时间和前台一样，是无限的
[_locationManager startMonitoringSignificantLocationChanges];
_locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
_locationManager.distanceFilter= 1;
_locationManager.pausesLocationUpdatesAutomatically = NO;
_locationManager.activityType = CLActivityTypeAutomotiveNavigation;
[_locationManager startUpdatingLocation];
}
}
return _locationManager;
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
while (true) {
[NSThread sleepForTimeInterval:1];
NSLog(@"processID = %d++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++CurrentThread = %@",[SSProcessInfo processID],[[NSThread currentThread] description]);
[self.locationManager allowDeferredLocationUpdatesUntilTraveled:CLLocationDistanceMax timeout:10];
}
}
注：程序测试必须真机下，观察log信息用Xcode上自带的Organizer工具。
经过分析log信息，发现processID不会变，说明程序能够持续运行。