EthereumContract with Custom ABI returns nil

[SwiftyLimi]

Problem:
I'm trying to initialize a smart contract uploaded lately on the Ropsten Test Network but without success so far.
Here is the contract: https://ropsten.etherscan.io/address/0x36cC04E8fDb5237EAD5B475089c640834436e61b

Using:
pod 'web3swift' , :git => 'https://github.com/lvyikai/web3swift.git', :branch => 'develop'

Steps to reproduce:

let ropstenContractABI: String = Uniswap.ABI
let ropstenEthereumAddress: EthereumAddress = EthereumAddress(Uniswap.address)!
let ropstenContract = EthereumContract(ropstenContractABI, at: ropstenEthereumAddress)

Where Uniswap.address is:

"0x36cC04E8fDb5237EAD5B475089c640834436e61b"

and Uniswap.ABI is :

"[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"","type":"address"}],"name":"Error","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"","type":"address"},{"indexed":false,"internalType":"uint256","name":"","type":"uint256"}],"name":"Received","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"claimOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"enum Router.OrderType","name":"orderType","type":"uint8"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"uint256","name":"assetInOffered","type":"uint256"},{"internalType":"uint256","name":"assetOutExpected","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"executeSwap","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_to","type":"address"}],"name":"feesWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"uint256","name":"amountIn","type":"uint256"}],"name":"getBestQuote","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"},{"internalType":"bool","name":"direct","type":"bool"},{"internalType":"bool","name":"renounce","type":"bool"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]"

For some reason, the library initializes the Contract when I use the Web3.Utils.erc20ABI, which is :

"[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_extraData","type":"bytes"}],"name":"approveAndCall","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"type":"function"},{"inputs":[{"name":"_initialAmount","type":"uint256"},{"name":"_tokenName","type":"string"},{"name":"_decimalUnits","type":"uint8"},{"name":"_tokenSymbol","type":"string"}],"type":"constructor"},{"payable":false,"type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"},]"

Your help would be much appreciated

Thank you in advance for taking the time to read this

[SwiftyLimi]

Removing {"stateMutability":"payable","type":"receive"} from the contract ABI, allowed me to initialize the contract for some reason !

[skywinder]

Thanks for the update. Did you realize, what cause the issue? I would be happy to send bounty for this fix.

[SwiftyLimi]

Hi @skywinder. The issue happened when a contract ABI included {"stateMutability":"payable","type":"receive"} on it's body. A type apparently missing on ABI.Element. Hence the parsing error which brought back a nil value.

I added a new receive type at ABI.Element that parses this type.

This ABI element, when present in a contract, indicates that the contract allows to receive tokens through a function call.