git clone https://github.com/bcl-chain/web3.go.git

// generate frameworkgomobile bind -target=ios 
./github.com/bcl-chain/web3
.go/mobile// generate arr jargomobile bind -target=android
 ./github.com/bcl-chain/web3.go/mobile

yarn
react-native run-android
react-native run-ios

// IOS
RCT_EXPORT_METHOD(getBalance:
         (NSString*) address:
         (RCTPromiseResolveBlock)resolve
         rejecter:(RCTPromiseRejectBlock)reject){
 // ip地址
 Web3goEthereumClient* client = Web3goNewEthereumClient(nodeIP, nil);
 Web3goContext* ctx = Web3goNewContext();
 // 账户地址
 Web3goAddress* address1 = Web3goNewAddressFromHex(address, nil);
 @try {
  Web3goBigInt* a = [client getBalanceAt:ctx account:address1 number:-1 error:nil];
  NSString* ammount = [a getString:10];
  NSLog(@"%@", ammount);
  resolve(ammount);
 } @catch (NSError *exception) {
  NSLog(@"NSError: %@", exception);
  reject(@"NSError: %@", @"There were no events", exception);
 } @finally {
  NSLog(@"finally");
 }
 
}

// android
@ReactMethod
public void getBalance(String address, Promise promise) {
  try {
   web3go.EthereumClient client = Web3go.newEthereumClient(nodeIP);
   web3go.Context ctx = Web3go.newContext();
   web3go.Address address1 = Web3go.newAddressFromHex(address);
   web3go.BigInt a = client.getBalanceAt(ctx, address1, -1);
   String ammout = a.getString(10);
   promise.resolve(ammout);
  } catch (Exception e) {
   promise.reject(e.getMessage());
  }
}

// react-native
async getBalance() {
  try {
   var ammount = await NativeModules.Web3go.getBalance(this.state.defGaAddress);
   this.setState({
    gaAmmount: ammount
   })
  } catch (e) {
   console.error(e);
  }
}