こんにちは！友好的な注意点：このページは、 Swift リクエストの操作に関する確かな概要を提供することを目的としています。実践的なコード例については、 API Methods documentation をチェックしてください。そこにはすべてのサポートされている言語ですぐに使用できる例があります！

# Web3.swift

Native Swift implementation for Ethereum.

import Web3
import BigInt

class EthereumClient {
    private let web3 = Web3(rpcURL: "YOUR_ETHEREUM_NODE_URL")

    func getBalance(address: String) async throws -> Double {
        let address = try EthereumAddress(hex: address, eip55: true)
        let balance = try await web3.eth.getBalance(address: address)
        return balance.converted(to: .ether).value
    }

    func sendTransaction(
        from: EthereumPrivateKey,
        to: String,
        amount: Double
    ) async throws -> String {
        let toAddress = try EthereumAddress(hex: to, eip55: true)
        let amount = EthereumAmount(value: amount, unit: .ether)

        let transaction = try await web3.eth.prepareTransaction(
            to: toAddress,
            value: amount,
            from: from.address
        )

        let signed = try transaction.sign(with: from)
        return try await web3.eth.send(transaction: signed)
    }
}

GitHub: web3.swift
Features:
- Native Swift implementation
- iOS and macOS support
- Async/await support
- Type-safe contract interactions
- Wallet management
- ENS support

# SwiftUI Integration

Modern SwiftUI example for Ethereum interactions:

import SwiftUI
import Web3

struct WalletView: View {
    @StateObject private var viewModel = WalletViewModel()

    var body: some View {
        VStack {
            Text("Balance: \(viewModel.balance) ETH")

            Button("Refresh") {
                Task {
                    await viewModel.updateBalance()
                }
            }
        }
    }
}

class WalletViewModel: ObservableObject {
    private let client = EthereumClient()
    @Published var balance: Double = 0

    func updateBalance() async {
        do {
            balance = try await client.getBalance(address: "YOUR_ADDRESS")
        } catch {
            print("Error: \(error)")
        }
    }
}

# Smart Contract Integration

Interact with smart contracts using Swift:

struct Contract {
    let web3 = Web3(rpcURL: "YOUR_ETHEREUM_NODE_URL")
    let contractAddress: EthereumAddress

    func callMethod() async throws -> String {
        let contract = try await web3.eth.Contract(
            json: contractABI,
            address: contractAddress
        )

        return try await contract.method(
            "methodName",
            parameters: [param1, param2],
            extraData: Data()
        ).call()
    }
}

# Error Handling

Proper Swift error handling for Ethereum operations:

enum EthereumError: Error {
    case invalidAddress
    case insufficientFunds
    case networkError(String)
}

extension EthereumClient {
    func safeGetBalance(address: String) async throws -> Double {
        guard address.hasPrefix("0x") else {
            throw EthereumError.invalidAddress
        }

        do {
            return try await getBalance(address: address)
        } catch {
            throw EthereumError.networkError(error.localizedDescription)
        }
    }
}

Swift Tools

# Web3.swift

# SwiftUI Integration

# Smart Contract Integration

# Error Handling

See also