Swift wrote the EOS open source framework SwiftyEOS

SwiftyEOS is an open source framework for interacting with EOS, written in Swift. Available on iOS and macOS.

Features: – EOS key pair generation – Private key import – Signature hashing – Basic RPC API (chain/History) queryable client – Transactions (EOS Token transfer) – Help classes to handle offline wallets on iOS – Encrypt/decrypt import private keys on iOS

How to use it

Key pair generation

SwiftyEOS now supports secP256K1 key pair.

Secp256r1 key pair generation bug but I can’t figure out why. Create the key from the unit test created by CLEOS — R1 will not pass. You might not consider secp256R1 as an option, because the cleos wallet command doesn’t import these keys either.

Generate a random key pair:

let (pk, pub) = generateRandomKeyPair(enclave: .Secp256k1)
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print("private key: \(pk! .wif())") print("public key : \(pub! .wif())") // private key: PVT_K1_5HxrYTdZX89zodtJhTzCk87MfNZAkiBRfFvSX8kacYjtwaDpTkL // public key : PUB_K1_4yDYdmcVcXxAxeNsUWRG7x9FKQE4HbJZdzgZFv1AYxk6oSVcLdCopy the code

print("private key: \(pk! .rawPrivateKey())") print("public key : \(pub! .rawPublicKey())") // private key: 5HxrYTdZX89zodtJhTzCk87MfNZAkiBRfFvSX8kacYjtwaDpTkL // public key : EOS4yDYdmcVcXxAxeNsUWRG7x9FKQE4HbJZdzgZFv1AYxk6oSVcLdCopy the code

Import existing keys:

let importedPk = try PrivateKey(keyString: "5HxrYTdZX89zodtJhTzCk87MfNZAkiBRfFvSX8kacYjtwaDpTkL")
let importedPub = PublicKey(privateKey: importedPk!)
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Delimiters and prefixes:

let importedPk = try PrivateKey(keyString: "PVT_K1_5HxrYTdZX89zodtJhTzCk87MfNZAkiBRfFvSX8kacYjtwaDpTkL")
let importedPub = PublicKey(privateKey: importedPk!)
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RPC API

EOSRPC.sharedInstance.chainInfo { (chainInfo, error) in if error == nil { print("Success: \(chainInfo!) ") } else { print("Error: \(error! .localizedDescription)") } }Copy the code

IOS key store

We have SEWallet. Swift offline Wallet Manager for iOS.

SEWallet. Swift makes it easy to save AES encrypted key information to the file system. The default location is the application sandbox.

Multiple wallet management is not currently supported.

Create a new wallet on iOS

[SEKeystoreService.sharedInstance newAccountWithPasscode:passcode succeed:^(SELocalAccount *account) {
} failed:^(NSError *error) {
        
}];
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Retrieve the saved wallet

[SELocalAccount currentAccount];
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If the wallet is not saved, it returns zero.

trading

Money transfer

Var transfer = transfer () transfer.from = "agoodaccount" transfer.to = "gq3dinztgage" transfer.quantity = "1.0000 EOS" transfer.memo = "eureka" Currency.transferCurrency(transfer: transfer, code: "eosio.token", privateKey: importedPk! , completion: { (result, error) in if error ! = nil { if error is RPCErrorResponse { print("\((error as! RPCErrorResponse).errorDescription())") } else { print("other error: \(String(describing: error? .localizedDescription))") } } else { print("done.") } })Copy the code

Submission of general transaction

Let account = "raoji" let asset = "1.0000 EPRA" let data = "{\"hey\": {\"account\":\"" + account + "\", \"quantity\":\"" + asset + "\"}}" let abi = try! AbiJson(code: "prabox1", action: "withdraw", json: data) TransactionUtil.pushTransaction(abi: abi, account: account, privateKey: importedPk! , completion: { (result, error) in if error ! = nil { if (error! as NSError).code == RPCErrorResponse.ErrorCode { print("\(((error! as NSError).userInfo[RPCErrorResponse.ErrorKey] as! RPCErrorResponse).errorDescription())") } else { print("other error: \(String(describing: error? .localizedDescription))") } } else { print("Ok. Txid: \(result! .transactionId)") } })Copy the code

AbiJson *your_abi;
[TransactionUtil pushTransactionWithAbi:your_abi
                                account:@"your_account"
                               pkString:@"your_private_key"
                             completion:^(TransactionResult *result, NSError *error) {
        
}];
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Wallet lock and unlock on (offline) devices on iOS

We add lock and timedUnlock functions to SELocalAccount.

Cpu/net/ram operation

ResourceUtil. StakeResource (account: "raoji", net: 1.0, CPU: 1.0, pkString: "5HsaHvRCPrjU3yhapB5rLRyuKHuFTsziidA13Uw6WnQTeJAG3t4", completion: { (result, error) in })Copy the code

mnemonics

Create a new key pair:

let (pk, pub, mn) = generateRandomKeyPair(enclave: .Secp256k1)
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Import existing mnemonics:

let (pk, mn) = PrivateKey(enclave: .Secp256k1, mnemonicString: "your words here")
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We have key management iOS Assistant apis and mnemonics in SEWallet. Swift. You can now create and import mnemonics using the SEKeystoreService class (or use the SEKeystore deeper API if you store them yourself) :

SEKeystoreService.sharedInstance.newAccountAndMnemonic(passcode: "your pass here", succeed: { (account, mnemonic) in

}) { (error) in

}
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We’re using NSObject native classes for all of our top-level apis, so it’s the same for calling Objective-C without providing additional bridge files.

There is also help for iOS in the SEWallet. Swift file.

thank you

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Huizhi net original translation, reprint please indicate the source. Here is the original EOS open source framework SwiftyEOS written by Swift