feat: Background download on iOS (#1442)

ui/flutter/ios/Runner.xcodeproj/project.pbxproj

@@ -21,6 +21,8 @@
 		D0E623A929482D160001185E /* Libgopeed.xcframework in Frameworks */ = {isa = PBXBuildFile; fileRef = D0E623A729482D030001185E /* Libgopeed.xcframework */; };
 		D0E623AA29482D160001185E /* Libgopeed.xcframework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = D0E623A729482D030001185E /* Libgopeed.xcframework */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
 		DCA5B0FA95A8007ADEDACA1B /* Pods_Runner.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 70BC8D37FAC641C7F20125E8 /* Pods_Runner.framework */; };
+		A10000000000000000000001 /* LocationKeepAliveManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = A10000000000000000000002 /* LocationKeepAliveManager.swift */;};
+		A10000000000000000000002 /* LocationKeepAliveManager.swift */ = {isa = PBXFileReference;lastKnownFileType = sourcecode.swift;path = LocationKeepAliveManager.swift;sourceTree = "<group>";};
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -153,18 +155,19 @@
 			sourceTree = "<group>";
 		};
 		97C146F01CF9000F007C117D /* Runner */ = {
-			isa = PBXGroup;
-			children = (
-				0C585CC72D41E36800FF2EC0 /* Runner.entitlements */,
-				97C146FA1CF9000F007C117D /* Main.storyboard */,
-				97C146FD1CF9000F007C117D /* Assets.xcassets */,
-				97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
-				97C147021CF9000F007C117D /* Info.plist */,
-				1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */,
-				1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */,
-				74858FAE1ED2DC5600515810 /* AppDelegate.swift */,
-				74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */,
-			);
+    			isa = PBXGroup;
+    			children = (
+        			0C585CC72D41E36800FF2EC0 /* Runner.entitlements */,
+        			97C146FA1CF9000F007C117D /* Main.storyboard */,
+        			97C146FD1CF9000F007C117D /* Assets.xcassets */,
+        			97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
+        			97C147021CF9000F007C117D /* Info.plist */,
+        			1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */,
+        			1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */,
+        			74858FAE1ED2DC5600515810 /* AppDelegate.swift */,
+        			A10000000000000000000002 /* LocationKeepAliveManager.swift */,
+        			74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */,
+    			);
 			path = Runner;
 			sourceTree = "<group>";
 		};
@@ -376,12 +379,13 @@
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 		97C146EA1CF9000F007C117D /* Sources */ = {
-			isa = PBXSourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-				74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */,
-				1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
-			);
+    			isa = PBXSourcesBuildPhase;
+    			buildActionMask = 2147483647;
+    			files = (
+        			74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */,
+        			A10000000000000000000001 /* LocationKeepAliveManager.swift in Sources */,
+        			1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
+    		);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXSourcesBuildPhase section */

ui/flutter/ios/Runner/AppDelegate.swift

@@ -32,6 +32,34 @@ import Libgopeed
             }
         })
         
+        let locationChannel = FlutterMethodChannel(
+            name: "gopeed/location_keep_alive",
+            binaryMessenger: controller.binaryMessenger
+)
+
+        locationChannel.setMethodCallHandler {
+            (call: FlutterMethodCall, result: @escaping FlutterResult) in
+
+        switch call.method {
+
+        case "requestPermission":
+          LocationKeepAliveManager.shared.requestPermission { authorized in
+            result(authorized)
+    }
+
+        case "start":
+            LocationKeepAliveManager.shared.start()
+            result(nil)
+
+        case "stop":
+            LocationKeepAliveManager.shared.stop()
+            result(nil)
+
+        default:
+            result(FlutterMethodNotImplemented)
+    }
+}
+        
         GeneratedPluginRegistrant.register(with: self)
 
         SwiftFlutterForegroundTaskPlugin.setPluginRegistrantCallback(registerPlugins)

ui/flutter/ios/Runner/Info.plist

@@ -106,5 +106,15 @@
 		<true/>
 		<key>LSSupportsOpeningDocumentsInPlace</key>
 		<true/>
+		<key>UIBackgroundModes</key>
+		<array>
+    			<string>location</string>
+		</array>
+		<key>NSLocationWhenInUseUsageDescription</key>
+		<string>Please go to Settings and change the location permission to "Always" so that the app can continue running in the background.</string>
+		<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
+		<string>Please go to Settings and change the location permission to "Always" so that the app can continue running in the background.</string>
+		<key>NSLocationAlwaysUsageDescription</key>
+		<string>Please go to Settings and change the location permission to "Always" so that the app can continue running in the background.</string>
 	</dict>
 </plist>

ui/flutter/ios/Runner/LocationKeepAliveManager.swift

@@ -0,0 +1,126 @@
+import Foundation
+import CoreLocation
+
+final class LocationKeepAliveManager: NSObject, CLLocationManagerDelegate {
+
+    static let shared = LocationKeepAliveManager()
+
+    private let locationManager = CLLocationManager()
+
+    private(set) var isRunning = false
+
+    private var permissionCompletion: ((Bool) -> Void)?
+
+    override init() {
+        super.init()
+
+        locationManager.delegate = self
+        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
+        locationManager.distanceFilter = kCLDistanceFilterNone
+        locationManager.pausesLocationUpdatesAutomatically = false
+
+        if #available(iOS 9.0, *) {
+            locationManager.allowsBackgroundLocationUpdates = true
+        }
+
+        if #available(iOS 14.0, *) {
+            locationManager.showsBackgroundLocationIndicator = true
+        }
+    }
+
+    func requestPermission(completion: @escaping (Bool) -> Void) {
+        let status = CLLocationManager.authorizationStatus()
+
+        switch status {
+        case .authorizedAlways:
+            completion(true)
+
+        case .authorizedWhenInUse:
+            completion(false)
+
+        case .denied, .restricted:
+            completion(false)
+
+        case .notDetermined:
+            permissionCompletion = completion
+            locationManager.requestAlwaysAuthorization()
+
+        @unknown default:
+            completion(false)
+        }
+    }
+
+
+    func start() {
+        guard !isRunning else {
+            return
+        }
+
+        let status = CLLocationManager.authorizationStatus()
+
+        guard status == .authorizedAlways else {
+            return
+        }
+
+        if #available(iOS 9.0, *) {
+            locationManager.allowsBackgroundLocationUpdates = true
+        }
+
+        locationManager.startUpdatingLocation()
+        isRunning = true
+    }
+
+    func stop() {
+        locationManager.stopUpdatingLocation()
+        isRunning = false
+    }
+
+    private func handleAuthorizationStatus(
+        _ status: CLAuthorizationStatus
+    ) {
+        switch status {
+        case .authorizedAlways:
+            permissionCompletion?(true)
+            permissionCompletion = nil
+
+        case .authorizedWhenInUse,
+             .denied,
+             .restricted:
+            permissionCompletion?(false)
+            permissionCompletion = nil
+
+        case .notDetermined:
+            break
+
+        @unknown default:
+            permissionCompletion?(false)
+            permissionCompletion = nil
+        }
+    }
+
+    @available(iOS 14.0, *)
+    func locationManagerDidChangeAuthorization(
+        _ manager: CLLocationManager
+    ) {
+        handleAuthorizationStatus(manager.authorizationStatus)
+    }
+
+    func locationManager(
+        _ manager: CLLocationManager,
+        didChangeAuthorization status: CLAuthorizationStatus
+    ) {
+        handleAuthorizationStatus(status)
+    }
+
+    func locationManager(
+        _ manager: CLLocationManager,
+        didUpdateLocations locations: [CLLocation]
+    ) {
+    }
+
+    func locationManager(
+        _ manager: CLLocationManager,
+        didFailWithError error: Error
+    ) {
+    }
+}