Ios 如何在 SwiftUI 中创建两个大小相同的正方形占据整个屏幕宽度

您接近了，可以使用LazyVGrid来确保视图始终为2列，然后使用GeometryReader来匹配大小

        import SwiftUI

    struct boxProblem: View {
        
        private let gridItemLayout = Array(repeating: GridItem(.flexible(), spacing: 10), count: 2)
        
        var body: some View {
            VStack {
                LazyVGrid(columns: gridItemLayout) {
                    SubscriptionPriceBox(title: "Basic Price",
                                         duration: "Monthly",
                                         price: "2.49$ / month",
                                         renewInfo: "Renew every month")
                    SubscriptionPriceBox(title: "Save 33%",
                                         duration: "Annual",
                                         price: "19.99$ / month",
                                         renewInfo: "Renew every year")
                }
                .padding(.horizontal)
            }
        }
    }

    struct SubscriptionPriceBox: View {
        let title: String
        let duration: String
        let price: String
        let renewInfo: String
        
        var body: some View {
            GeometryReader { geometry in
                ZStack(alignment: .topLeading) {
                    
                    VStack {
                        VStack {
                            Text(duration)
                            Text(price)
                        }
                        Text(renewInfo)
                    }
                    .frame(maxWidth: .infinity)
                    .frame(height: geometry.size.width)
                    .overlay {
                        RoundedRectangle(cornerRadius: 2)
                            .stroke(.gray, lineWidth: 2)
                    }
                    Text(title)
                        .background(Color.yellow)
                        .offset(x: -20, y: -10)
                }
                .background(Color.red)
            }
        }
    }