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PositionProvider.swift
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PositionProvider.swift
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//
// Copyright 2015 - 2022 Anton Tananaev (anton@traccar.org)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
import UIKit
import CoreLocation
protocol PositionProviderDelegate: AnyObject {
func didUpdate(position: Position)
}
class PositionProvider: NSObject, CLLocationManagerDelegate {
weak var delegate: PositionProviderDelegate?
var locationManager: CLLocationManager
var lastLocation: CLLocation?
var deviceId: String
var interval: Double
var distance: Double
var angle: Double
var pendingStart = false
override init() {
let userDefaults = UserDefaults.standard
deviceId = userDefaults.string(forKey: "device_id_preference")!
interval = userDefaults.double(forKey: "frequency_preference")
distance = userDefaults.double(forKey: "distance_preference")
angle = userDefaults.double(forKey: "angle_preference")
locationManager = CLLocationManager()
super.init()
locationManager.delegate = self
locationManager.pausesLocationUpdatesAutomatically = false
switch userDefaults.string(forKey: "accuracy_preference") ?? "medium" {
case "high":
locationManager.desiredAccuracy = kCLLocationAccuracyBest
case "low":
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
default:
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
}
if #available(iOS 9.0, *) {
locationManager.allowsBackgroundLocationUpdates = true
}
}
func startUpdates() {
switch CLLocationManager.authorizationStatus() {
case .authorizedAlways:
locationManager.startUpdatingLocation()
default:
pendingStart = true
locationManager.requestAlwaysAuthorization()
}
}
func stopUpdates() {
locationManager.stopUpdatingLocation()
}
func getBatteryStatus() -> BatteryStatus {
let device = UIDevice.current
if device.batteryState != .unknown {
return BatteryStatus(
level: device.batteryLevel * 100,
charging: device.batteryState == .charging || device.batteryState == .full
)
} else {
return BatteryStatus(level: 0, charging: true)
}
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
switch status {
case .authorizedAlways, .authorizedWhenInUse:
if pendingStart {
pendingStart = false
locationManager.startUpdatingLocation()
}
default:
break
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.last {
if lastLocation == nil
|| location.timestamp.timeIntervalSince(lastLocation!.timestamp) >= interval
|| (distance > 0 && DistanceCalculator.distance(fromLat: location.coordinate.latitude, fromLon: location.coordinate.longitude, toLat: lastLocation!.coordinate.latitude, toLon: lastLocation!.coordinate.longitude) >= distance)
|| (angle > 0 && fabs(location.course - lastLocation!.course) >= angle) {
let position = Position(managedObjectContext: DatabaseHelper().managedObjectContext)
position.deviceId = deviceId
position.setLocation(location)
let batteryStatus = getBatteryStatus()
position.battery = batteryStatus.level as NSNumber
position.charging = batteryStatus.charging
delegate?.didUpdate(position: position)
lastLocation = location
}
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
}
}