locationManager：didStartMonitoringForRegion：錯誤區域回調

Question

我正在使用locationManager:didStartMonitoringForRegion:進行區域監控。有時回調包含錯誤的區域，即使在CLLocationManager.monitoredRegions中顯示的右側區域也是如此。

的locationManager:didStartMonitoringForRegion:消息：

- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region { 
    NSLog(@"Started monitoring %@ region", region.identifier); 
    NSLog(@"Monitored regions: %@", self.locationManager.monitoredRegions); 
} 

這裏一個示例輸出（具有改變經度/ latidue保存地方）

2013-12-13 20:01:34.047 N[] Started monitoring Hamburg region 
2013-12-13 20:01:34.048 N[] Monitored regions: {(
    CLCircularRegion (identifier:'Hamburg', center:<+47.0,+8.1>, radius:1000.00m), 
    CLCircularRegion (identifier:'Zürich', center:<+47.0,+8.0>, radius:500.00m), 
    CLCircularRegion (identifier:'St.Gallen', center:<+47.0,+9.0>, radius:5000.00m) 
)} 
2013-12-13 20:01:42.070 N[] Started monitoring Hamburg region 
2013-12-13 20:01:42.072 N[] Monitored regions: {(
    CLCircularRegion (identifier:'Hamburg', center:<+47.0,+8.1>, radius:1000.00m), 
    CLCircularRegion (identifier:'Zürich', center:<+47.0,+8.0>, radius:500.00m), 
    CLCircularRegion (identifier:'St.Gallen', center:<+47.0,+9.0>, radius:5000.00m) 
)} 
2013-12-13 20:01:46.837 N[] Started monitoring Hamburg region 
2013-12-13 20:01:46.839 N[] Monitored regions: {(
    CLCircularRegion (identifier:'Hamburg', center:<+47.0,+8.1>, radius:1000.00m), 
    CLCircularRegion (identifier:'Zürich', center:<+47.0,+8.0>, radius:500.00m), 
    CLCircularRegion (identifier:'St.Gallen', center:<+47.0,+9.0>, radius:5000.00m) 
)} 

我開始didUpdateLocations監視其被稱爲我打電話startMonitoringSignificantLocationChanges

後回

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{ 
    NSLog(@"%s", __PRETTY_FUNCTION__); 
    [manager stopMonitoringSignificantLocationChanges]; 
    if (locations && [locations count]){ 
     CLLocation* position = [locations lastObject]; 
     NSLog(@"New Location latitude: %f longitude %f", position.coordinate.latitude, position.coordinate.longitude); 
     //self.geofences.allValues is containing Hamburg,Zürich and St.Gallen 
     for(CLCircularRegion *geofence in self.geofences.allValues) { 
      if(![self.locationManager.monitoredRegions containsObject:geofence]){ 
       [self.locationManager startMonitoringForRegion:geofence]; 
      } 
      if([geofence containsCoordinate:[position coordinate]]){ 
       [self locationManager:manager didEnterRegion:geofence]; 
      } 
     } 
    } 
} 

該didEnterRegion爲@synchronized以保證原子性。

任何想法？

Answer 1

我不明白爲什麼它會出現重複註冊相同的區域。我的懷疑會導致我在那裏添加一些額外的NSLog調用來驗證源代碼self.geofences的內容。我要做的另一件事是在那裏休息觀察For循環中的值和條件。其他

兩個項目我會檢查：

1. 確認您是從if(![self.locationManager.monitoredRegions containsObject:geofence]){得到預期的結果。不保證CLLocationManager中的對象與您最初註冊的對象相同。您應該使用isEqualToString正確測試標識符。您可能會無意中更換您的區域，因爲您已經寫入了該區域。
2. 如果該地區已經註冊，我認爲您不需要撥打didEnterRegion。在發射之間報道邊界事件。即使應用程序被終止，它應該在重新啓動時自動處理。

如果這些都不能說明問題，我會研究如何以及何時啓動/停止位置服務。是否有可能每個調用都是didUpdateLocations方法的另一個迭代？

我認爲這是第一次被調用，在全新的會話中，monitoredRegions是空的，因此您的過程按預期工作。我發現在隨後的位置更新中可能出現不可預知的行爲的原因。

我會開始通過完全改變你的for循環。

if (locations && locations.count) { 
    CLLocation* position = [locations lastObject]; 
    NSSet *regionIdentifiers = [self.locationManager.monitoredRegions valueForKey:@"identifier"]; 
    NSSet *regionsForMonitoring = [NSSet setWithArray:self.geofences.allValues]; 
    NSSet *unMonitoredRegions = [regionsForMonitoring objectsPassingTest:^BOOL(id obj, BOOL *stop) { 
     CLCircularRegion *regionForTest = (CLCircularRegion *)obj; 
     if (![regionIdentifiers containsObject:regionForTest.identifier]) { 
      return YES; 
     } else { 
      return NO; 
     } 
    }]; 

    for (CLCircularRegion *geofence in unMonitoredRegions) { 
     [self.locationManager startMonitoringForRegion:geofence]; 
     // We'll check if we are in the new region as it was not previously monitored 
     if([geofence containsCoordinate:[position coordinate]]){ 
      [self locationManager:manager didEnterRegion:geofence]; 
     } 
    } 
}