shape.strokeBorder(lineWidth: 3)  //解决裁边的问题
LazyVGrid(columns: [GridItem(),GridItem(),GridItem()])  //设置为固定3列
ScrollView //滑动，解决超出
.aspectRatio(2/3, contentMode: .fit) //设置默认宽高比
LazyVGrid(columns: [GridItem(.adaptive(minimum: 65))]) //设置卡片最小宽度，横屏不会超大

代码备份

import SwiftUI


struct ContentView: View {
    var emojis = ["🚙", "🚗", "⛱", "🎡", "🪝", "🗿", "🛖", "⏱", "☎️", "🎰","🚜","🛴", "✈️"]
    @State var emojiCount = 4
    
    var body: some View {
        VStack {
            ScrollView {
                LazyVGrid(columns: [GridItem(.adaptive(minimum: 65))]){
                    ForEach(emojis[0..<emojiCount], id: \.self) { emoji in
                        CardView(content: emoji).aspectRatio(2/3, contentMode: .fit)
                    }
                }
            }
            .foregroundColor(.red)
            Spacer()
            HStack {
                remove
                Spacer()
                add
            }
            .font(.largeTitle)
            .padding(.horizontal)
        }
        .padding(.horizontal)
        
    }
    var remove: some View {
        Button(action:{
            if emojiCount > 1{
                emojiCount -= 1
            }
        }, label: {
            Image(systemName: "minus.circle")
        })
    }
    var add: some View {
        Button(action:{
            if emojiCount < emojis.count {
                emojiCount += 1
            }
        }, label: {
            Image(systemName: "plus.circle")
        })
    }
}

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.strokeBorder(lineWidth: 3)
                Text(content).font(.largeTitle)
                
            } else {
                shape.fill()
            }
        }
        .onTapGesture {
            isFaceUp = !isFaceUp
        }
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .preferredColorScheme(/*@START_MENU_TOKEN@*/.dark/*@END_MENU_TOKEN@*/)
        ContentView()
            .preferredColorScheme(.light)
    }
}