performance question, For example, there are 10 NSString parameters

[xiushaomin]

When there are many parameters and there is also a callback, multiple parameter objects and block objects are created every time the method is called, so is it really faster than the method channel? do you have a test？

[yulingtianxia]

See this article: http://yulingtianxia.com/blog/2019/11/28/DartObjC-Design/

We should do more tests.

[xiushaomin]

because I want to get some native information through methodchannel before runApp(), but methodchannel has some problems, so I am also looking at ffi-related methods. I read your article that the performance has been greatly improved. I think the performance problem of methodchannel should be Is it the encode/decode byteDate and match to the channel?

I think dart-native create objects is also very performance consuming？ The following is my test dart-native code, when the parameter increases, the performance decreases.

class RealChannel {
  static const MethodChannel _channel =
  const MethodChannel('dart_native');

  static Future<String> get platformVersion async {
    final String version = await _channel.invokeMethod('getPlatformVersion',["xxxx", 'xxxxx', 'xxxxx', 'xxxxx', 'xxxxx']);
    return version;
  }
}

  final time = DateTime.now().millisecondsSinceEpoch;
  for (int i = 0; i < 10000; i++) {
     final value = await RealChannel.platformVersion;
     print(value);
  }
 /// 4568ms
  print("------------ channel ${DateTime.now().millisecondsSinceEpoch - time}");

  final time2 = DateTime.now().millisecondsSinceEpoch;
  for (int i = 0; i < 10000; i++) {
    stub.fooCompletion('xxx', 'xxxx', 'xxxxxx', 'xxxxxx', (NSString value) {
      print(value.raw);
    });
  }
 /// 5768ms
  print("------------ native ${DateTime.now().millisecondsSinceEpoch - time2}");

  final time3 = DateTime.now().millisecondsSinceEpoch;
  for (int i = 0; i < 10000; i++) {
    stub.fooCompletion1((NSString value) {
      print(value.raw);
    });
  }
 /// 3639ms
  print("------------ native2 ${DateTime.now().millisecondsSinceEpoch - time3}");

[yulingtianxia]

Converting a Dart String to a NSString is time-consuming. This happens in both Channel and DartNative. We are trying to optimize it. See this issue: https://github.com/dart-native/dart_native/issues/22

[xiushaomin]

ok，thanks！learned a lot in this project~

[yulingtianxia]

ok，thanks！learned a lot in this project~

Thank you for using DartNative. We are still developing and optimizing.