kmpdfkit_demo/ios/Classes/CompdfkitFlutterPlugin.m

#import "CompdfkitFlutterPlugin.h"
#import "FLNativeView.h"

#import <ComPDFKit/ComPDFKit.h>

@implementation CompdfkitFlutterPlugin

+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
    
  FlutterMethodChannel* channel = [FlutterMethodChannel
      methodChannelWithName:@"com.compdfkit.flutter.plugin"
            binaryMessenger:[registrar messenger]];
  CompdfkitFlutterPlugin* instance = [[CompdfkitFlutterPlugin alloc] init];

  [registrar addMethodCallDelegate:instance channel:channel];
    
  FLNativeViewFactory* factory =
  [[FLNativeViewFactory alloc] initWithMessenger:registrar.messenger];
    [registrar registerViewFactory:factory withId:@"com.compdfkit.flutter.pdfviewer"];
}

- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
  if ([@"sdk_version_code" isEqualToString:call.method]) {
    result([CPDFKit sharedInstance].versionString);
  } else if ([@"init_sdk" isEqualToString:call.method]) {
      NSDictionary *initInfo = (NSDictionary *)call.arguments;
      NSString *key = initInfo[@"key"] ?: @"";
      NSString *secret = initInfo[@"secret"] ?: @"";
      [CPDFKit setLicenseKey:key secret:secret];
  } else if ([@"sdk_build_tag" isEqualToString:call.method]) {
      result([@"iOS build tag:" stringByAppendingFormat:@"%ld", [CPDFKit sharedInstance].buildNumber]);
  } else {
    result(FlutterMethodNotImplemented);
  }
}

@end