每5分鐘取GPS位置

Question

在我的位置應用中執行didUpdateToLocation方法。此方法每秒調用一次並提供位置數據。但是我不需要每秒鐘獲取位置，我只需要每5分鐘啓動一次該方法。是否有可能做到這一點？

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    //initialize location lisetener on Application startup 
    self.myLocationManager = [[CLLocationManager alloc]init]; 
    self.myLocationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    self.myLocationManager.delegate = self; 
    [self.myLocationManager startUpdatingLocation]; 


    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    // Override point for customization after application launch. 
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { 
     self.viewController = [[INNOViewController alloc] initWithNibName:@"INNOViewController_iPhone" bundle:nil]; 
    } else { 
     self.viewController = [[INNOViewController alloc] initWithNibName:@"INNOViewController_iPad" bundle:nil]; 
    } 
    self.window.rootViewController = self.viewController; 
    [self.window makeKeyAndVisible]; 
    return YES; 
} 


-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
    /* 
    if(self.executingInBackground) 
    { 
     NSLog(@"Aplication running in background"); 
    } 
    else 
    { 
     NSLog(@"Aplication NOT running in background"); 
    } 
    */ 


    //NSLog(@"new location->%@ and old location -> %@",newLocation,oldLocation); 

    NSString *urlAsString = @"http://www.apple.com"; 

    NSURL *url=[NSURL URLWithString:urlAsString]; 

    NSURLRequest *urlRequest=[NSURLRequest requestWithURL:url]; 

    NSOperationQueue *queue = [[NSOperationQueue alloc]init]; 


    [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { 

     if ([data length] > 0 && error == nil) { 
      NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 
      NSLog(@"Downloaded html -> %@",html); 
      //NSLog(@"Downloaded successfully"); 
     } 
     else if([data length] == 0 && error == nil) 
     { 
      NSLog(@"Nothing downloaded"); 
     } 
     else 
     { 
      NSLog(@"Error occured -> %@",error); 
     } 

    }]; 
} 

Answer 1

減少accuraccy和距離過濾器，這樣會減少在該方法被調用
頻率如果你想讓它5分鐘後叫那麼你可以強制調用的方法stopupdating和startupdating每五分鐘

Answer 2

因爲您要求kCLLocationAccuracyBest，所以很快就會這麼做。退後一點。它不是基於時間，而是基於三角距離。在這種精確度下，即使距離發生微小變化，也會在接收良好的地區觸發更新。使用不同的值。

此外，這些方法並不打算基於時間使用。它們意味着根據增量距離使用。

Answer 3

相反的：

[self.myLocationManager startUpdatingLocation]; 

使用：

[self.myLocationManager startMonitoringSignificantLocationChanges]; 

如果你使用：startUpdatingLocation它會調用每個第二委託方法。當您使用startMonitoringSignificantLocationChanges時，它會在發生重大位置變化或間隔5分鐘後調用委託方法。

---

startMonitoringSignificantLocationChanges

Starts the generation of updates based on significant location changes. - (void)startMonitoringSignificantLocationChanges

Discussion

This method initiates the delivery of location events asynchronously, returning shortly after you call it. Location events are delivered to your delegate’s locationManager:didUpdateLocations: method. The first event to be delivered is usually the most recently cached location event (if any) but may be a newer event in some circumstances. Obtaining a current location fix may take several additional seconds, so be sure to check the timestamps on the location events in your delegate method.

After returning a current location fix, the receiver generates update events only when a significant change in the user’s location is detected. For example, it might generate a new event when the device becomes associated with a different cell tower. It does not rely on the value in the distanceFilter property to generate events. Calling this method several times in succession does not automatically result in new events being generated. Calling stopMonitoringSignificantLocationChanges in between, however, does cause a new initial event to be sent the next time you call this method.

If you start this service and your application is subsequently terminated, the system automatically relaunches the application into the background if a new event arrives. In such a case, the options dictionary passed to the locationManager:didUpdateLocations: method of your application delegate contains the key UIApplicationLaunchOptionsLocationKey to indicate that your application was launched because of a location event. Upon relaunch, you must still configure a location manager object and call this method to continue receiving location events. When you restart location services, the current event is delivered to your delegate immediately. In addition, the location property of your location manager object is populated with the most recent location object even before you start location services.

In addition to your delegate object implementing the locationManager:didUpdateLocations: method, it should also implement the locationManager:didFailWithError: method to respond to potential errors.

Note: Apps can expect a notification as soon as the device moves 500 meters or more from its previous notification. It should not expect notifications more frequently than once every five minutes. If the device is able to retrieve data from the network, the location manager is much more likely to deliver notifications in a timely manner.

Declared In CLLocationManager.h

參考CLLocationManager

Answer 4

你可以使用startMonitoringSignificantLocationChanges代替startUpdatingLocation。只有當用戶從最後位置移動大約500米時纔會更新。