SwiftUI error All In One

Instance member xxx cannot be used on type yyy

Instance member 'game' cannot be used on type 'ContentView_Previews'

//
//  ContentView.swift
//  MemorizeGame
//
//  Created by 夏凌晨 on 2020/10/28.
//  Copyright © 2020 xgqfrms. All rights reserved.
//

// viewModel
import SwiftUI

// ✅ some View，返回任意類型的 View, 自動推斷 View 類型
// Identifiable
struct ContentView: View {
  var viewModel: EmojiMemoryGame

  var body: some View {
    HStack {
      // ForEach(0..<4) { index in
      ForEach(viewModel.cards) { card in
        // print("index \(index)")
        CardView(card: card).onTapGesture {
          // self
          self.viewModel.choose(card: card)
        }
        // CardView(isFaceUp: (index % 2 == 0))
      }
    }
//    HStack {
//      CardView(isFaceUp: true)
//      CardView(isFaceUp: false)
//      CardView(isFaceUp: true)
//      CardView(isFaceUp: false)
//    }
  }
}

struct CardView: View {
  var card: MemoryGame<String>.Card
  // var isFaceUp: Bool
  // var isFaceUp: Bool = false
  var body: some View {
    ZStack {
      if card.isFaceUp {
        RoundedRectangle(cornerRadius: 10.0).fill(Color.white)
        RoundedRectangle(cornerRadius: 10.0).stroke(lineWidth: 3.0)
        Text(card.content).font(.largeTitle)
        // Text("👻").font(.largeTitle)
      } else {
        RoundedRectangle(cornerRadius: 10.0).fill(Color.orange)
      }
    }.padding()
  }
}




//  PreviewProvider 僅用於預覽，代碼在項目中沒有實際的意義
struct ContentView_Previews: PreviewProvider {
  let game = EmojiMemoryGame()
  static var previews: some View {
    ContentView(viewModel: game)
  }
}

change file name bug

1. old MemorizeGame ❌

//
//  ContentView.swift
//  MemorizeGame

2. new MemoryGame ✅

//
//  ContentView.swift
//  MemoryGame

refs

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