如何在 iOS 上使用基于地理的推送通知?

区域监控以类似的方式工作 - 包括在被终止后重新启动应用程序 - 但精度更高(取决于 Wifi 网络和手机信号塔的可用性):

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):

具体的阈值距离由硬件和当前可用的定位技术决定.例如，如果禁用 Wi-Fi，则区域监控的准确性会大大降低.但是，出于测试目的，您可以假设最短距离约为 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.

另一个区域监控考虑是(根据 CLLocationManager 类参考) 区域进出通知可能仅在跨越区域边界后 3-5 分钟左右收到.

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.

根据实际需求，可以使用区域监控来获取粗略"位置，然后当用户在特定区域内时，在位置管理器上启动更准确的基于 GPS 的服务.当用户离开感兴趣的区域时，关闭GPS服务以节省电池并再次恢复到粗略的位置监控服务(即区域监控).这是一个基本的实现:

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];
}

记得将适当的条目添加到应用程序的 plist 文件中，以便应用程序在后台运行并访问适当的资源:

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>

以上代码假设使用 iOS6 和 ARC

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