Swift to Objective-C: Flutter Plugin Code Conversion

+ (void)registerWithRegistrar:(NSObject*)registrar {\n SwiftFlutterAmapTrackPlugin.channel = [FlutterMethodChannel\n methodChannelWithName:@"flutter_amap_track"\n binaryMessenger:[registrar messenger]];\n SwiftFlutterAmapTrackPlugin *instance = [[SwiftFlutterAmapTrackPlugin alloc] init];\n [registrar addMethodCallDelegate:instance channel:SwiftFlutterAmapTrackPlugin.channel];\n}