Flutter ile iOS Entegrasyonu: Platform Channel ve Native Modüller

1// Dart tarafı
2import 'package:flutter/services.dart';
3 
4class BatteryService {
5  static const _channel = MethodChannel('com.myapp/battery');
6 
7  Future getBatteryLevel() async {
8    final int level = await _channel.invokeMethod('getBatteryLevel');
9    return level;
10  }
11 
12  Future isCharging() async {
13    return await _channel.invokeMethod('isCharging');
14  }
15}

1// iOS Swift tarafı (AppDelegate.swift)
2import Flutter
3import UIKit
4 
5@UIApplicationMain
6@objc class AppDelegate: FlutterAppDelegate {
7    override func application(
8        _ application: UIApplication,
9        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
10    ) -> Bool {
11        let controller = window?.rootViewController as! FlutterViewController
12        let channel = FlutterMethodChannel(
13            name: "com.myapp/battery",
14            binaryMessenger: controller.binaryMessenger
15        )
16 
17        channel.setMethodCallHandler { [weak self] call, result in
18            switch call.method {
19            case "getBatteryLevel":
20                let level = self?.getBatteryLevel() ?? -1
21                result(level)
22            case "isCharging":
23                let charging = self?.isCharging() ?? false
24                result(charging)
25            default:
26                result(FlutterMethodNotImplemented)
27            }
28        }
29 
30        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
31    }
32 
33    private func getBatteryLevel() -> Int {
34        UIDevice.current.isBatteryMonitoringEnabled = true
35        return Int(UIDevice.current.batteryLevel * 100)
36    }
37 
38    private func isCharging() -> Bool {
39        UIDevice.current.isBatteryMonitoringEnabled = true
40        return UIDevice.current.batteryState == .charging
41    }
42}

1// Dart - sürekli konum güncellemesi al
2class LocationService {
3  static const _channel = EventChannel('com.myapp/location');
4 
5  Stream> get locationStream {
6    return _channel.receiveBroadcastStream().map((event) {
7      final map = Map.from(event);
8      return {
9        'latitude': map['latitude'] as double,
10        'longitude': map['longitude'] as double,
11      };
12    });
13  }
14}

1// iOS - EventChannel handler
2class LocationStreamHandler: NSObject, FlutterStreamHandler, CLLocationManagerDelegate {
3    private let locationManager = CLLocationManager()
4    private var eventSink: FlutterEventSink?
5 
6    func onListen(withArguments arguments: Any?, eventSink events: @escaping FlutterEventSink) -> FlutterError? {
7        self.eventSink = events
8        locationManager.delegate = self
9        locationManager.startUpdatingLocation()
10        return nil
11    }
12 
13    func onCancel(withArguments arguments: Any?) -> FlutterError? {
14        locationManager.stopUpdatingLocation()
15        eventSink = nil
16        return nil
17    }
18 
19    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
20        guard let location = locations.last else { return }
21        eventSink?([
22            "latitude": location.coordinate.latitude,
23            "longitude": location.coordinate.longitude,
24        ])
25    }
26}

1// pigeon/messages.dart - Pigeon şema tanımı
2import 'package:pigeon/pigeon.dart';
3 
4class SearchRequest {
5  String? query;
6  int? limit;
7}
8 
9class SearchResponse {
10  List? results;
11  int? totalCount;
12}
13 
14@HostApi()
15abstract class SearchApi {
16  SearchResponse search(SearchRequest request);
17}
18 
19// pigeon generate komutu ile Swift ve Dart kodu otomatik oluşturulur
20// flutter pub run pigeon --input pigeon/messages.dart

1// iOS Native MKMapView'ı Flutter'da göster
2class MapViewFactory: NSObject, FlutterPlatformViewFactory {
3    func create(withFrame frame: CGRect, viewIdentifier viewId: Int64,
4                arguments args: Any?) -> FlutterPlatformView {
5        return MapPlatformView(frame: frame, viewId: viewId, args: args)
6    }
7}
8 
9class MapPlatformView: NSObject, FlutterPlatformView {
10    private let mapView: MKMapView
11 
12    init(frame: CGRect, viewId: Int64, args: Any?) {
13        mapView = MKMapView(frame: frame)
14        super.init()
15    }
16 
17    func view() -> UIView { mapView }
18}

1// Dart tarafında kullanım
2Widget build(BuildContext context) {
3  return UiKitView(
4    viewType: 'native-map-view',
5    creationParams: {'latitude': 41.0, 'longitude': 29.0},
6    creationParamsCodec: StandardMessageCodec(),
7  );
8}

1// Podfile'a ekle
2// pod 'Flutter', :podspec => '../my_flutter/.ios/Flutter/Flutter.podspec'
3 
4// FlutterViewController'ı göster
5let flutterEngine = FlutterEngine(name: "my engine")
6flutterEngine.run()
7 
8let flutterVC = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
9present(flutterVC, animated: true)

1// Engine group ile birden fazla Flutter ekranı
2class FlutterEngineManager {
3    static let shared = FlutterEngineManager()
4    let engineGroup = FlutterEngineGroup(name: "multi-engine", project: nil)
5 
6    func makeEngine(entrypoint: String? = nil) -> FlutterEngine {
7        engineGroup.makeEngine(withEntrypoint: entrypoint, libraryURI: nil)
8    }
9}

1// Swift tarafında detaylı hata döndürme
2channel.setMethodCallHandler { call, result in
3    switch call.method {
4    case "processImage":
5        guard let args = call.arguments as? [String: Any],
6              let path = args["path"] as? String else {
7            result(FlutterError(
8                code: "INVALID_ARGS",
9                message: "path parametresi gerekli",
10                details: "Beklenen: [String: Any] icinde 'path' key'i"
11            ))
12            return
13        }
14 
15        do {
16            let processed = try ImageProcessor.process(path: path)
17            result(processed)
18        } catch let error as ImageError {
19            result(FlutterError(
20                code: "PROCESSING_FAILED",
21                message: error.localizedDescription,
22                details: "File: \(path), Error code: \(error.code)"
23            ))
24        } catch {
25            result(FlutterError(
26                code: "UNKNOWN",
27                message: error.localizedDescription,
28                details: nil
29            ))
30        }
31    default:
32        result(FlutterMethodNotImplemented)
33    }
34}

1// Dart tarafında hata yakalama
2Future processImage(String path) async {
3  try {
4    final result = await _channel.invokeMethod('processImage', {'path': path});
5    return result ?? '';
6  } on PlatformException catch (e) {
7    switch (e.code) {
8      case 'INVALID_ARGS':
9        throw ArgumentError(e.message ?? 'Gecersiz arguman');
10      case 'PROCESSING_FAILED':
11        throw ProcessingException(e.message ?? 'Islem basarisiz', details: e.details);
12      default:
13        throw Exception('Bilinmeyen hata: ' + e.message);
14    }
15  }
16}

1// Background thread'de agir islem
2channel.setMethodCallHandler { call, result in
3    if call.method == "heavyComputation" {
4        DispatchQueue.global(qos: .userInitiated).async {
5            let output = performHeavyTask()
6            DispatchQueue.main.async {
7                result(output)
8            }
9        }
10    }
11}