SwiftUI-单张事项卡片

import SwiftUI

struct ContentView: View {
    
    //@State属性包装器，isChecked是一种State，编译器会一直盯着，如果isChecked改变则所有用到它的视图都要更新
    @State var isChecked: Bool = false
    
    var body: some View {
        HStack {
            
            Rectangle()
                .frame(width: 6)
                .foregroundColor(.blue)
            
            VStack(alignment: .leading, spacing: 6) {
                Text("写作业")
                    .font(.headline)
                    .fontWeight(.heavy)
                Text("2020.02.02")
                    .font(.subheadline)
                    .foregroundColor(Color.gray)
            }
            .padding(.leading)
            Spacer()
            
            Image(systemName: self.isChecked ? "checkmark.square.fill" : "square")
                .imageScale(.large)
                .padding(.trailing)
                .onTapGesture {
                    self.isChecked.toggle()
                }
        }
        .frame(height: 80)
        .background(Color.white)
        .cornerRadius(10)
        .shadow(radius: 10, x: 0, y: 10)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}