😎주제

현상금 앱을 MVVM 패턴을 이용해서 재설정
Model, View, ViewModel로 구현

📒 MVVM 패턴 알아보기

🖥 Code

BountyViewController

import UIKit

class BountyViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    // Model
    // 이름, 정보 - BountyInfo
    
    // View
    // -ListCell에 필요한 정보를 ViewController가 아닌 ViewModel에게서 받아야함
    // -ListCell은 ViewModel에게서 받은 정보를 View Update 하기
    
    // ViewModel
    // - BountyViewModel
    // - View에서 필요한 메서드
    // - Model -> BountyInfo 가지고 있기
    
    let viewModel = BountyViewModel()
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // DetailViewController 데이터 줄꺼에요
        if segue.identifier == "showDetail" {
            let vc = segue.destination as? DetailViewController
            if let index = sender as? Int {
                
                let bountyInfo = viewModel.bountyInfo(at: index)
                vc?.viewModel.update(model: bountyInfo)
            }
        }
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    // UITableViewDataSource
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return viewModel.numOfBountyInList
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? ListCell else {
            return UITableViewCell()
        }
        
        let bountyInfo = viewModel.bountyInfo(at: indexPath.row)
        cell.update(info: bountyInfo)
        return cell
    }
    
    // UITableViewDelegate
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("--> \(indexPath.row)")
        performSegue(withIdentifier: "showDetail", sender: indexPath.row)
    }
}

class ListCell: UITableViewCell {
    @IBOutlet weak var imgView: UIImageView!
    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var bountyLabel: UILabel!
    
    func update(info: BountyInfo) {
        imgView.image = info.image
        nameLabel.text = info.name
        bountyLabel.text = "\(info.bounty)"
    }
}


struct BountyInfo {
    let name: String
    let bounty: Int
    
    var image: UIImage? {
        return UIImage(named: "\(name).jpg")
    }
    
    init(name: String, bounty: Int) {
        self.name = name
        self.bounty = bounty
    }
}

class BountyViewModel {
    let bountyInfoList: [BountyInfo] = [
        BountyInfo(name: "brook", bounty: 33000000),
        BountyInfo(name: "chopper", bounty: 50),
        BountyInfo(name: "franky", bounty: 44000000),
        BountyInfo(name: "luffy", bounty: 300000000),
        BountyInfo(name: "nami", bounty: 16000000),
        BountyInfo(name: "robin", bounty: 80000000),
        BountyInfo(name: "sanji", bounty: 77000000),
        BountyInfo(name: "zoro", bounty: 120000000)
    ]
    
    var sortedList: [BountyInfo] {
        let sortedList = bountyInfoList.sorted { (lhs, rhs) -> Bool in
            return lhs.bounty > rhs.bounty
        }
        return sortedList
    }
    
    var numOfBountyInList: Int {
        return bountyInfoList.count
    }
    
    func bountyInfo(at index: Int) -> BountyInfo {
        return sortedList[index]
    }
}

DetailViewController

import UIKit

class DetailViewController: UIViewController {
    
    // Model
    // 이름,정보 BountyInfo
    
    // View
    // imgView, nameLabel, bountyLabel
    // ViewModel를 통해서 정보를 받기
    
    // ViewModel
    // DetailViewModel
    // view에 필요한 메서드
    // Model, BountyInfo
    
    @IBOutlet weak var imgView: UIImageView!
    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var bountyLabel: UILabel!
    
    let viewModel = DetailViewModel()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        updateUI()
    }
    
    func updateUI() {
        
        if let bountyInfo = self.viewModel.bountyInfo {
            imgView.image = bountyInfo.image
            nameLabel.text = bountyInfo.name
            bountyLabel.text = "\(bountyInfo.bounty)"
        }
    }
    
    @IBAction func close(_ sender: Any) {
        dismiss(animated: true, completion: nil)
    }
}

class DetailViewModel {
    var bountyInfo: BountyInfo?
    
    func update(model: BountyInfo?) {
        bountyInfo = model
    }
}