區域監控以類似的方式工作 - 包括在被終止后重新啟動應用程序 - 但精度更高(取決于 Wifi 網絡和手機信號塔的可用性):

Region Monitoring works in a similar way - including restarting the app after being terminated - but with higher accuracy (depending on availability of Wifi networks and cell towers):

具體的閾值距離由硬件和當前可用的定位技術決定.例如，如果禁用 Wi-Fi，則區域監控的準確性會大大降低.但是，出于測試目的，您可以假設最短距離約為 200 米.

The specific threshold distances are determined by the hardware and the location technologies that are currently available. For example, if Wi-Fi is disabled, region monitoring is significantly less accurate. However, for testing purposes, you can assume that the minimum distance is approximately 200 meters.

另一個區域監控考慮是(根據 CLLocationManager 類參考) 區域進出通知可能僅在跨越區域邊界后 3-5 分鐘左右收到.

Another region monitoring consideration is that (according to the CLLocationManager class reference) region entry and exit notifications might only be received 3-5 minutes or so after crossing the region's boundaries.

根據實際需求，可以使用區域監控來獲取粗略"位置，然后當用戶在特定區域內時，在位置管理器上啟動更準確的基于 GPS 的服務.當用戶離開感興趣的區域時，關閉GPS服務以節省電池并再次恢復到粗略的位置監控服務(即區域監控).這是一個基本的實現:

Depending on the actual requirements, region monitoring could be used for obtaining a "rough" location and then when the user is within a specific region, start up the more accurate GPS based service on the location manager. When the user leaves the region of interest, turn off the GPS service to preserve battery and revert to the rough location monitoring service (ie. region monitoring) once again. Here's a basic implementation:

SomeViewController.m:

...
@interface SomeViewController () <CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, strong) CLRegion *someRegion;

@end

@implementation SomeViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.locationManager = [[CLLocationManager alloc] init];

    CLLocationDistance radius = 10; // 10 metre sensitivity
    self.someRegion = [[CLRegion alloc] initCircularRegionWithCenter:someCoordinates radius:radius identifier:@"Smithtown Dry Cleaners"];

    self.locationManager.delegate = self;
    [self.locationManager startMonitoringForRegion:self.someRegion];

    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.distanceFilter = 10;
    [self.locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    [self.locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
    [self.locationManager stopUpdatingLocation];
}

// Delegate method from the CLLocationManagerDelegate protocol.
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation* location = [locations lastObject];

    // If the user's current location is not within the region anymore, stop updating
    if ([self.someRegion containsCoordinate:location.coordinate] == NO) {
        [self.locationManager stopUpdatingLocation];
    }

    NSString *locationData = [NSString stringWithFormat:@"latitude %+.6f, longitude %+.6f
",
                              location.coordinate.latitude,
                              location.coordinate.longitude];
    NSLog(@"%@", locationData);

    UILocalNotification *localNotification = [[UILocalNotification alloc] init];
    localNotification.alertBody = locationData;
    localNotification.alertAction = @"Location data received";
    localNotification.hasAction = YES;
    [[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
}

記得將適當的條目添加到應用程序的 plist 文件中，以便應用程序在后臺運行并訪問適當的資源:

Remember to add the appropriate entries to the application's plist file so the app will run in the background with access to the appropriate resources:

MyApp-Info.plist:

<key>UIBackgroundModes</key>
<array>
        ...
        <string>location</string>
</array>
<key>UIRequiredDeviceCapabilities</key>
<array>
        ...
        <string>location-services</string>
        <string>gps</string>
</array>

以上代碼假設使用 iOS6 和 ARC

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