2022-03-17 可以翻转了

import SwiftUI

struct ContentView: View {
    var body: some View {
        HStack {
            CardView()
            CardView()
            CardView()
            CardView()
        }
        .padding()
        .foregroundColor(.red)
        
    }
}

struct CardView: View {
    @State var isFaceUp: Bool = true
    var body: some View {
        ZStack {
            let shape = RoundedRectangle(cornerRadius: 20)
            if isFaceUp {
            shape.fill().foregroundColor(.white)
            shape.stroke(lineWidth: 3)
            Text("💝").font(.largeTitle)
            } else {
                shape.fill()
            }
        }
        .onTapGesture {
            isFaceUp = !isFaceUp
        }
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .preferredColorScheme(.dark)
        ContentView()
            .preferredColorScheme(.light)
    }
}

import SwiftUI

struct ContentView: View {
    var emojis: Array<String> = ["❤️", "🧡", "💙", "🖤"]
    
    var body: some View {
        HStack {
            CardView(content: emojis[0])
            CardView(content: emojis[1])
            CardView(content: emojis[2])
            CardView(content: emojis[3])
        }
        .padding()
        .foregroundColor(.red)
        
    }
}

struct CardView: View {
    var content: String
    @State var isFaceUp: Bool = true
    
    var body: some View {
        ZStack {
            let shape = RoundedRectangle(cornerRadius: 20)
            if isFaceUp {
            shape.fill().foregroundColor(.white)
            shape.stroke(lineWidth: 3)
            Text(content).font(.largeTitle)
            } else {
                shape.fill()
            }
        }
        .onTapGesture {
            isFaceUp = !isFaceUp
        }
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .preferredColorScheme(.dark)
        ContentView()
            .preferredColorScheme(.light)
    }
}

import SwiftUI

struct ContentView: View {
    var emojis: Array<String> = ["❤️", "🧡", "💙", "🖤"]
    
    var body: some View {
        HStack {
            ForEach(emojis, id: \.self){ emoji in
                CardView(content: emoji)
            }
        }
        .padding()
        .foregroundColor(.red)
        
    }
}

struct CardView: View {
    var content: String
    @State var isFaceUp: Bool = true
    
    var body: some View {
        ZStack {
            let shape = RoundedRectangle(cornerRadius: 20)
            if isFaceUp {
            shape.fill().foregroundColor(.white)
            shape.stroke(lineWidth: 3)
            Text(content).font(.largeTitle)
            } else {
                shape.fill()
            }
        }
        .onTapGesture {
            isFaceUp.toggle()
        }
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .preferredColorScheme(.dark)
        ContentView()
            .preferredColorScheme(.light)
    }
}