Since the FlutterBinaryMessenger has been remove from FlutterViewController, I got the compiler error in my Swift Project:

Argument type 'FlutterViewController' does not conform to expected type 'FlutterBinaryMessenger'

What should I pass to the second param for initial the FlutterMethodChannel instance in swift project?

got the resolve from #35773

Old Code:

[FlutterMethodChannel 
methodChannelWithName:@"foo" 
binaryMessenger:flutterViewController]

New Code:

[FlutterMethodChannel 
methodChannelWithName:@"foo"
binaryMessenger:flutterViewController.binaryMessenger]

Great @lhp3851 , your solution worked to me, but flutterViewController.binaryMessenger looks to be deprecated. :(

I'm not know very well. According the annotation of this property:

"This is just a convenient way to get the |FlutterEngine|'s binary messenger."

It seems to be the property binaryMessenger should belongs to FlutterEngine class, and I lookup the Docs, The FlutterEngine did maintain this property .

Based on the API docs the implementation in question does still exist.
https://api.flutter.dev/objcdoc/Classes/FlutterViewController.html#/c:objc(cs)FlutterViewController(py)binaryMessenger