获取用户位置每n分钟应用被切换到后台后， [英] Getting user location every n minutes after app goes to background
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问题描述
我试图实施<给定的建议href=\"http://stackoverflow.com/questions/6347503/how-do-i-get-a-background-location-update-every-n-minutes-in-my-ios-application\">this帖子。
不幸的是，步骤我也不清楚。我试图执行这些建议，但backgroundTimeRemaining继续即使我开始和停止locationServices减少。这是我开发的：
- （无效）applicationDidEnterBackground：（UIApplication的*）{应用 UIApplication的*应用= [UIApplication的sharedApplication] bgTask = [应用beginBackgroundTaskWithExpirationHandler：^ {
[应用endBackgroundTask：bgTask];
bgTask = UIBackgroundTaskInvalid;
}]; //开始长时间运行的任务，并立即返回。
dispatch_async（dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0），^ { //完成与任务相关的工作。
self.timer =零;
[个体经营initTimer] }）;
}
initTimer：
- （无效）{initTimer //创建位置管理器，如果此对象不
//已经有一个。
如果（零== self.locationManager）
self.locationManager = [[CLLocationManager的alloc]初始化]; self.locationManager.delegate =自我;
[self.locationManager startMonitoringSignificantLocationChanges] 如果（self.timer ==无）{
self.timer = [的NSTimer scheduledTimerWithTimeInterval：0.3
目标：自我
选择：@选择（checkUpdates :)
用户信息：无
重复：YES];
}
}
checkUpdates：
- （无效）checkUpdates：（*的NSTimer）定时器{
UIApplication的*应用= [UIApplication的sharedApplication]
双剩余= app.backgroundTimeRemaining;
如果（剩余＆LT; 580.0）{
[self.locationManager startUpdatingLocation]
[self.locationManager stopUpdatingLocation]
[self.locationManager startMonitoringSignificantLocationChanges]
}
DbgLog（@Reminaing％F，app.backgroundTimeRemaining）;
}
有没有人有什么可能是错误的，我code有何建议？无论initTimer和checkUpdates都被称为，但仅仅是在为背景执行时间（+ - 10分钟）。我希望应用程序每n分钟永远更新的位置。
我的应用程序的UIBackgroundModes设置为位置。
更新：
我现在重新上didUpdateToLocation和didFailWithError计时器。但仍backgroundTimeRemaining不断下降：
- （空）的LocationManager：（CLLocationManager *）经理
didUpdateToLocation：（CLLocation *）newLocation
fromLocation：（CLLocation *）oldLocation {的NSLog（@难道更新位置=％F /％F，[newLocation坐标] .latitude，[newLocation坐标] .longitude）;UIApplication的*应用= [UIApplication的sharedApplication]bgTask = [应用beginBackgroundTaskWithExpirationHandler：^ {
[应用endBackgroundTask：bgTask];
bgTask = UIBackgroundTaskInvalid;
}];//开始长时间运行的任务，并立即返回。
dispatch_async（dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0），^ { //完成与任务相关的工作。 [个体经营initTimer]}）;
} - （无效）的LocationManager：（CLLocationManager *）经理didFailWithError：（NSError *）错误{[self.locationManager stopUpdatingLocation]
UIApplication的*应用= [UIApplication的sharedApplication]bgTask = [应用beginBackgroundTaskWithExpirationHandler：^ {
[应用endBackgroundTask：bgTask];
bgTask = UIBackgroundTaskInvalid;
}];//开始长时间运行的任务，并立即返回。
[个体经营initTimer]
dispatch_async（dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0），^ { //完成与任务相关的工作。}）;}
我也是无效的计时器：
- （无效）checkUpdates：（*的NSTimer）定时器{
UIApplication的*应用= [UIApplication的sharedApplication]
双剩余= app.backgroundTimeRemaining;
如果（剩余＆LT;＆580.0功放;＆安培;其余＆GT; 570.0）{
[self.timer无效]
self.timer =零;
[self.locationManager startUpdatingLocation]
[self.locationManager stopUpdatingLocation]
}
DbgLog（@********检查更新!!!!!!!!!!! Reminaing％F应用程序。 backgroundTimeRemaining）;
}
解决方案
几天以后，尝试所有可能的解决方案我终于能够使它发挥作用。下面是什么是错在我的解决方案：
- 我需要设置2 UIBackgroundTaskIdentifier，一个计时器，另一个用于的LocationManager
在我的解决方案，只需添加：
的UIApplication *应用= [UIApplication的sharedApplication]bgTask2 = [应用beginBackgroundTaskWithExpirationHandler：^ {[应用endBackgroundTask：bgTask2]; bgTask2 = UIBackgroundTaskInvalid; }];self.locationManager.delegate =自我;
[self.locationManager startUpdatingLocation]
I am trying to implement the suggestions given in this post.
Unfortunately the steps are not clear to me. I tried implementing those suggestions, but the backgroundTimeRemaining continues to decrease even after I start and stop locationServices. This is how I developed it:
- (void)applicationDidEnterBackground:(UIApplication *)application {
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Do the work associated with the task.
self.timer = nil;
[self initTimer];
});
}
initTimer:
- (void)initTimer {
// Create the location manager if this object does not
// already have one.
if (nil == self.locationManager)
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self.locationManager startMonitoringSignificantLocationChanges];
if (self.timer == nil) {
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.3
target:self
selector:@selector(checkUpdates:)
userInfo:nil
repeats:YES];
}
}
checkUpdates:
- (void)checkUpdates:(NSTimer *)timer{
UIApplication* app = [UIApplication sharedApplication];
double remaining = app.backgroundTimeRemaining;
if(remaining < 580.0) {
[self.locationManager startUpdatingLocation];
[self.locationManager stopUpdatingLocation];
[self.locationManager startMonitoringSignificantLocationChanges];
}
DbgLog(@"Reminaing %f", app.backgroundTimeRemaining);
}
Does anyone have a suggestion on what might be wrong in my code? Both initTimer and checkUpdates are being called, but only during for the background execution time (+- 10 Mins). I want the app to update the location every n minutes "forever".
My app's UIBackgroundModes is set to location.
UPDATE:
I am now resetting the timer on didUpdateToLocation and didFailWithError. But still the backgroundTimeRemaining keeps decreasing:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
NSLog(@"Did Update Location = %f / %f", [newLocation coordinate].latitude, [newLocation coordinate].longitude);
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Do the work associated with the task.
[self initTimer];
});
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
[self.locationManager stopUpdatingLocation];
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
[self initTimer];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Do the work associated with the task.
});
}
I am also invalidating the timer:
- (void)checkUpdates:(NSTimer *)timer{
UIApplication* app = [UIApplication sharedApplication];
double remaining = app.backgroundTimeRemaining;
if(remaining < 580.0 && remaining > 570.0) {
[self.timer invalidate];
self.timer = nil;
[self.locationManager startUpdatingLocation];
[self.locationManager stopUpdatingLocation];
}
DbgLog(@"*************************Checking for updates!!!!!!!!!!! Reminaing %f", app.backgroundTimeRemaining);
}
解决方案
After some days trying all possible solutions I was finally able to make it work. Here is what was wrong in my solution:
- I need to setup 2 UIBackgroundTaskIdentifier, one for the timer, and another one for the locationManager
On my solution, just add:
UIApplication *app = [UIApplication sharedApplication];
bgTask2 = [app beginBackgroundTaskWithExpirationHandler:^{ [app endBackgroundTask:bgTask2]; bgTask2 = UIBackgroundTaskInvalid; }];
self.locationManager.delegate = self;
[self.locationManager startUpdatingLocation];
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