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To use Swift's FlutterMethodChannel without flutterViewController, you can follow these steps:

1. Create a new FlutterEngine instance:

let engine = FlutterEngine(name: "my_engine")
engine.run();

1. Instantiate the FlutterMethodChannel:

guard let flutterChannel = FlutterMethodChannel(name: "my_channel", binaryMessenger: engine.binaryMessenger) else {
    return
}

1. Set up the method to be called from Flutter:

func myMethod(arguments: Any?) -> String? {
    // Code to execute
    return "Result of my method"
}

1. Set up the call handler to receive calls from Flutter:

flutterChannel.setMethodCallHandler { [weak self] (call: FlutterMethodCall, result: FlutterResult) in
    guard call.method == "myMethod" else {
        result(FlutterMethodNotImplemented)
        return
    }
    let arguments = call.arguments
    let response = self?.myMethod(arguments: arguments)
    result(response)
}

With these steps, you should be able to use Swift's FlutterMethodChannel without the need for flutterViewController.