ios - 如何使用地理围栏和 CLCircularRegion 设置 "Check-In"警报？

Question

我正在尝试设置一个警报，一旦用户输入特定位置，警报就会弹出并允许用户“ checkin ”。用户 checkin 后，应用程序会通知 api 端点用户已成功 checkin 。这是我第一次使用地理围栏和核心定位。我了解了如何设置它的基本概念，但不完全确定签到警报和地理围栏如何结合在一起。这是我的代码:

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate{


  var manager = CLLocationManager()


  override func viewDidLoad() {
    super.viewDidLoad()


    // Core Location
    manager.delegate = self
    manager.desiredAccuracy = kCLLocationAccuracyBest
    manager.requestWhenInUseAuthorization()
    manager.startUpdatingLocation()


    var latitude: CLLocationDegrees = 43.039278
    var longitude: CLLocationDegrees = -87.932479
    var center: CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    var radius: CLLocationDistance = CLLocationDistance(10.0)
    var identifier: String = "storeID"

    var geoRegion: CLCircularRegion = CLCircularRegion(center: center, radius: radius, identifier: identifier)

  }


  func showSimpleAlertWithTitle(title: String!, message: String!, viewController: UIViewController) {
    let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
    let action = UIAlertAction(title: "Check-In", style: .Cancel , handler: nil)
    alert.addAction(action)
    viewController.presentViewController(alert, animated: true, completion: nil)
  }


}

Answer 1

1. 在 CLCircularRegion 上设置 notifyOnEntry = true，以便在进入或退出该区域时收到通知。
2. 实现locationManager:didEnterRegion:委托(delegate)方法来处理事件。

示例:

override func viewDidLoad() {
    super.viewDidLoad()


    manager.delegate = self
    manager.desiredAccuracy = kCLLocationAccuracyBest
    manager.requestWhenInUseAuthorization()
    manager.startUpdatingLocation()

    var latitude: CLLocationDegrees = 43.039278
    var longitude: CLLocationDegrees = -87.932479
    var center: CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    var radius: CLLocationDistance = CLLocationDistance(10.0)
    var identifier: String = "storeID"

    var geoRegion: CLCircularRegion = CLCircularRegion(center: center, radius: radius, identifier: identifier)
    geoRegion.notifyOnEntry = true

    manager.startMonitoringForRegion(geoRegion)
}


func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {

    showSimpleAlertWithTitle("Entered region \(region.identifier)", message: nil)
}

func showSimpleAlertWithTitle(title: String!, message: String!) {
    let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
    let action = UIAlertAction(title: "Check-In", style: .Cancel , handler: nil)
    alert.addAction(action)
    presentViewController(alert, animated: true, completion: nil)
  }

参见:CLRegion.notifyOnEntry