Swift SDK Overview - Para Docs

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Para Swift SDK eliminates the complexity of blockchain integration by providing a unified interface for wallet creation, authentication, and multi-chain transactions in iOS applications.

Quick Start

AuthView.swift

import SwiftUI
import ParaSwift

struct AuthView: View {
    @EnvironmentObject var paraManager: ParaManager
    @Environment(\.webAuthenticationSession) private var webAuthenticationSession
    @Environment(\.authorizationController) private var authorizationController

    var body: some View {
        VStack {
            Button("Authenticate") {
                startAuth()
            }
        }
        .task {
            // Reuse the system WebAuthenticationSession for hosted auth flows
            paraManager.setDefaultWebAuthenticationSession(webAuthenticationSession)
        }
    }

    private func startAuth() {
        Task {
            do {
                let authState = try await paraManager.initiateAuthFlow(auth: .email("user@example.com"))

                switch authState.stage {
                case .done:
                    // One Click hosted auth finished automatically
                    handleAuthenticatedUser()
                case .verify:
                    // Show OTP or passkey enrollment UI
                    presentVerification(authState)
                case .signup:
                    // Let the user pick passkey vs password enrollment
                    presentSignupOptions(authState)
                case .login:
                    // Existing user — Para chooses passkey/password automatically
                    try await paraManager.handleLogin(
                        authState: authState,
                        authorizationController: authorizationController
                    )
                    handleAuthenticatedUser()
                default:
                    // Handle other states as needed (e.g., show error UI)
                    break
                }
            } catch {
                // Handle errors according to your UI needs
            }
        }
    }
}

Implement lightweight helpers like handleAuthenticatedUser(), presentVerification(_:), or presentSignupOptions(_:) to align with your navigation flow. Create the ParaManager once at your app entry point (for example with @StateObject in App) and inject it into views with .environmentObject(paraManager).

Sign Transactions

TransactionHandler.swift

// Get wallet
let wallets = try await paraManager.fetchWallets()
let evmWallet = wallets.first { $0.type == .evm }!
let solanaWallet = wallets.first { $0.type == .solana }!

// EVM transaction
let transaction = EVMTransaction(
    to: "0x742d35Cc6634C0532925a3b844Bc9e7595f6E2c0",
    value: BigUInt("1000000000000000")!, // 0.001 ETH in wei
    gasLimit: BigUInt("21000")!
)

let result = try await paraManager.signTransaction(
    walletId: evmWallet.id,
    transaction: transaction,
    chainId: "11155111", // Sepolia
    rpcUrl: "https://sepolia.infura.io/v3/YOUR_API_KEY"
)

// Solana message signing  
let signature = try await paraManager.signMessage(
    walletId: solanaWallet.id,
    message: "Hello, Solana!"
)

Next Steps