Web3Swift与自定义ABI的交互

我正试图与我建立的智能合约互动。 基本上，目标是从iOS应用程序5设置参数

projectTitle

projectLocation

projectStart

projectEnd

teamType

我希望用户设置这些参数并将其写入ropsten testnetwork

我还希望在以后用户需要时获得合同信息

我的solidity代码在remix中正常工作，合同已经部署：

pragma solidity >=0.4.22 <0.7.0;

contract ProjectContent {
    
    string public projectTitle;
    string public projectLocation;
    string public projectStart;
    string public projectEnd;
    string public teamType;

    
    function projectContent(string initialProjectTitle, string initialProjectLocation, string initialProjectStart, string initialProjectEnd, string initialTeamType) public {
        projectTitle = initialProjectTitle;
        projectLocation = initialProjectLocation;
        projectStart = initialProjectStart;
        projectEnd = initialProjectEnd;
        teamType = initialTeamType;
    }
    
    function setContract(string newProjectTitle, string newProjectLocation, string newProjectStart, string newProjectEnd, string newTeamType) public {
        projectTitle = newProjectTitle;
        projectLocation = newProjectLocation;
        projectStart = newProjectStart;
        projectEnd = newProjectEnd;
        teamType = newTeamType;
        
    }
   
    function getProjectTitle() public view returns (string) {
      return projectTitle;
    } 
    
    function getProjectLocation() public view returns (string) {
      return projectLocation;
    } 
    
    function getProjectStart() public view returns (string) {
        return projectStart;
    }
    
    function getProjectEnd() public view returns (string) {
        return projectEnd;
    }
    
    function getTeamType() public view returns (string) {
        return teamType;
    }

    
   
}

我得到一个

结果的错误，它说：
调用可以抛出，但未标记为“try”，并且未处理错误

一般来说，我发现很难与智能合约abi建立交互

我已经在使用web3swift功能发送交易了，它的工作方式很有魅力

也许有人知道我如何在区块链上记录信息，并使用web3swift获取信息

不幸的是，互联网上的东西在这方面确实没有帮助

谢谢你的帮助：）
你很接近了。从错误开始
“调用可以抛出，但它没有标记为“try”，并且错误没有得到处理”
这是由于尝试
调用
合约函数而不使用try-Catch模式造成的。按照web3库的设计方式执行此模式对于所有写入和调用方法都是必需的

//不正确
让结果=transactionIntermediate！。通话（交易选项：选项）
//正确的
做{
让结果=尝试transactionIntermediate！。调用（transactionOptions:options）
}抓住{
打印（“尝试调用方法\（错误）”时出错）
}

此外，我建议在进行合同调用时使用
DispatchQueue.main.async
以及
Promise Kit库

ABI很难阅读，也很混乱，不要建议使用它来帮助在合同中找到可调用的方法和参数。相反，我会让契约沿着Xcode端打开，并通过使用包含将要使用的所有契约方法的enum或struct来打开

//合同中可用的方法
枚举方法：字符串{
案例projectContract=“项目内容”
案例setContract=“setContract”
案例getProjectTitle=“getProjectTitle”
案例getProjectLocation=“getProjectLocation”
案例getProjectStart=“getProjectStart”
案例getProjectEnd=“getProjectEnd”
case getTeamType=“getTeamType”
}
//用法
ContractMethods.setContract.rawValue

我将ABI移动到xcode中的一个单独文件中，以保持其干净。这是文件

下面是一个很好的例子，可以帮助您开始学习。查看我的更新版本。希望这有帮助，如果您还有任何问题，请告诉我。：）

导入UIKit
导入web3swift
进口承诺书
结构钱包{
let地址：String
让数据：数据
let name:String
让我想想，布尔
}
结构HDKey{
名称：字符串？
let地址：String
}
var password=“”//为ganache留空或使用您的钱包密码
let privateKey=”“//钱包的私钥
让walletName=“我的钱包”
let contractAddress=“”//0x11A0c067d7481240dCA57457eff77fc98dEAdE0F
让端点=URL（字符串：”http://127.0.0.1:7545")! // 我正在使用Ganache，但它可能看起来像endpoint=URL（字符串）：https://rinkeby.infura.io/v3/")!
设abiVersion=2
类ViewController:UIViewController{
//合同中使用的模拟数据
让projectTitle=“房屋壁板”
let projectLocation=“佐治亚州达库拉赛马大道299号30019”
让projectStart=“2021年5月14日”
让projectEnd=“2021年6月15日”
让teamType=“协作”
var web3:web3？
var合同：web3.web3合同？
重写func viewDidLoad（）{
super.viewDidLoad（）
//1.使用私钥创建钱包
让formattedKey=privateKey.trimmingCharacters（在：。空格和换行符中）
让dataKey=Data.fromHex（formattedKey）！
让keyStore=try！以太坊keystorev3（privateKey:dataKey，password:password）！
让keyData=try！JSONEncoder（）.encode（keyStore.keystreparams）
让address=keyStore.addresses！.first！.address
let wallet=wallet（地址：地址，数据：keyData，名称：walletName，isHD:false）
//2.构建web3和密钥管理器
做{
web3=尝试web3.new（端点）
let data=wallet.data
var keysteremanager:keysteremanager
如果钱包是我的{
让keystore=BIP32Keystore（数据）！
keystoreManager=keystoreManager（[keystore]）
}否则{
让keystore=EthereumKeystoreV3（数据）！
keystoreManager=keystoreManager（[keystore]）
}
打印（密钥管理器地址）
web3！.addKeystoreManager（keystoreManager）
让ethContractAddress=EthereumAddress（contractAddress，ignoreChecksum:true）！
contract=web3！。contract（contractABI，地址：ethContractAddress，abiVersion:abiVersion）！
}抓住{
打印（“无法构造合同和/或密钥管理器\（错误）”）
}
//3.创建并调用合同方法
//让参数=[projectTitle，projectLocation，projectStart，projectEnd，teamType]作为[AnyObject]//用于创建新项目的参数
将参数=[]设为[AnyObject]//无参数
让响应=承诺{盖章
DispatchQueue.global（）.async{
//捕获异步调用中的错误
做{
//方法调用没有额外的数据
let extraData:Data=Data（）
//方法调用的选项
var options=TransactionOptions.defaultOptions
class ProjectContractViewController: UIViewController, HalfModalPresentable {

    @IBOutlet weak var contractABIView: UITextView!
    
    
    var halfModalTransitioningDelegate: HalfModalTransitioningDelegate?
    
    var contractABI = "[{\"constant\":false,\"inputs\":[{\"name\":\"initialProjectTitle\",\"type\":\"string\"},{\"name\":\"initialProjectLocation\",\"type\":\"string\"},{\"name\":\"initialProjectStart\",\"type\":\"string\"},{\"name\":\"initialProjectEnd\",\"type\":\"string\"},{\"name\":\"initialTeamType\",\"type\":\"string\"}],\"name\":\"projectContent\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"newProjectTitle\",\"type\":\"string\"},{\"name\":\"newProjectLocation\",\"type\":\"string\"},{\"name\":\"newProjectStart\",\"type\":\"string\"},{\"name\":\"newProjectEnd\",\"type\":\"string\"},{\"name\":\"newTeamType\",\"type\":\"string\"}],\"name\":\"setContract\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectEnd\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectLocation\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectStart\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectTitle\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getTeamType\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectEnd\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectLocation\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectStart\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectTitle\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"teamType\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}]"
    
    
    let str = "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       
    var contractAddress = EthereumAddress("0x11A0c067d7481240dCA57457eff77fc98dEAdE0F")

    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    
    func callContract(Password: String) {
        
        // Get from address from private key
        
        let formattedKey = Password.trimmingCharacters(in: .whitespacesAndNewlines)
        let dataKey = Data.fromHex(formattedKey )!
                    
                    // @@@ use [passKey]
        let keystore = try! EthereumKeystoreV3(privateKey: dataKey, password: "")!

  
        let keyData = try! JSONEncoder().encode(keystore.keystoreParams)
//            let address = keystore.addresses!.first!.address
        let address =  keystore.addresses!.first!.address
        let ethAddress = EthereumAddress(address)
        
        
        let infura = Web3.InfuraMainnetWeb3()
        // 1
        let contract = infura.contract(contractABI, at: contractAddress, abiVersion: 2)
        // 2
        var options = TransactionOptions.defaultOptions
            options.from = keystore.addresses!.first!
        // 3
        
        let data = Data.init(hex: str)

        let transactionIntermediate = contract?.method("getProjectTitle", parameters: [address] as [AnyObject], extraData: data, transactionOptions: options)
            
        // 4
        let result = transactionIntermediate!.call(transactionOptions: options)
        
        switch result {
        // 5
        case .success(let res):
            let ans = res["0"] as! Bool
            DispatchQueue.main.async {
                completion(Result.Success(ans))
            }
        case .failure(let error):
            DispatchQueue.main.async {
                completion(Result.Error(error))
            }
        }
    }
}