finding Gas Limit using Abi file in swift

[vanijain3108]

I am building crypto wallet iOS application . I am facing an issue regarding estimateGas Fee in swift . in this library document we give limit manually and static but when I need to transfer native and custom token then we need to known the gas limit using erc20Abi file and contract . I tried lots of method from which some give less gas fee error while transfer token some give execution reverted . I need a proper solution of this problem .
if any one can help for resolving this that would be big help for me

[JeneaVranceanu]

We had a similar question on Discord. Maybe it was from you: https://discord.com/channels/852230666292559882/855076147985776661/1217652210331025529

But to put it simple there's only one function to estimate gas that you'll need to execute a transaction and that is web3.eth.estimateGas.

Example:

        let web3 = try await Web3.InfuraMainnetWeb3(accessToken: Constants.infuraToken)
        var tx = CodableTransaction(
            type: .eip1559,
            to: EthereumAddress("0xb47292B7bBedA4447564B8336E4eD1f93735e7C7")!,
            chainID: web3.provider.network!.chainID,
            value: try XCTUnwrap(Utilities.parseToBigUInt("0.1", units: .ether))
        )
        tx.from = EthereumAddress("0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B")!
        // Estimation is not an exact value of what transaction will cost
        // but close to it. Consider adding 5-10% to make sure your transaction passes.
        let estimation = try await web3.eth.estimateGas(for: tx)

[vanijain3108]

it working