iOS在通知服务扩展中获取用户位置

Question

在UNNotificationServiceExtension中可以使用CoreLocation框架吗？我尝试过的：

class NotificationService: UNNotificationServiceExtension {

    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?
    private let locationManager = CLLocationManager()

    override func didReceive(_ request: UNNotificationRequest,
                             withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        os_log("%{public}@",
        log: OSLog(subsystem: "bundleIdentifier", category: "WakeUpExtension"),
        type: OSLogType.debug,
        "Push received")
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()

        self.contentHandler = contentHandler
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
    }

    override func serviceExtensionTimeWillExpire() {
        os_log("%{public}@",
        log: OSLog(subsystem: "bundleIdentifier", category: "WakeUpExtension"),
        type: OSLogType.debug,
        "Task expired")
        locationManager.stopUpdatingLocation()
        locationManager.delegate = nil

        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
            contentHandler(bestAttemptContent)
        }
    }

}

extension NotificationService: CLLocationManagerDelegate {

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        locations.forEach {
            os_log("%{public}@",
            log: OSLog(subsystem: "bundleIdentifier", category: "WakeUpExtension"),
            type: OSLogType.debug,
            $0.horizontalAccuracy)
        }

        for location in locations {
            let locationAge = -location.timestamp.timeIntervalSinceNow
            if locationAge < 5 {
                os_log("%{public}@",
                log: OSLog(subsystem: "bundleIdentifier", category: "WakeUpExtension"),
                type: OSLogType.debug,
                "Send")
                locationManager.stopUpdatingLocation()
                locationManager.delegate = nil
                contentHandler?(UNNotificationContent())
            }
        }
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        os_log("%{public}@",
        log: OSLog(subsystem: "bundleIdentifier", category: "WakeUpExtension"),
        type: OSLogType.debug,
        error.localizedDescription)
    }
}

我在控制台里得到的只有：

​

Answer 1

看起来在UNNotificationServiceExtension中永远不会调用CLLocationManagerDelegate方法。但是可以从CLLocationManager location属性中获取最后接收到的位置：

 let locationManager = CLLocationManager()
 let lastLocation = locationManager.location

Answer 2

您需要实现一个后台url会话。它有助于延迟扩展到期，在这种情况下，直到位置更新被传递(以及任何其他编写的后期处理)。

private lazy var urlSession: URLSession = {
    let config = URLSessionConfiguration.background(withIdentifier: "MySession")
    config.sessionSendsLaunchEvents = true
    return URLSession(configuration: config, delegate: self, delegateQueue: nil)
}()

参考：https://developer.apple.com/documentation/foundation/url_loading_system/downloading_files_in_the_background