SwiftUIViewDemo.swift

//
//  SwiftUIViewDemo.swift
//
//  Created by Peter Larson on 5/25/20.
//  Copyright © 2020 Peter Larson. All rights reserved.
//

import SwiftUI
import SwiftUIPager

struct SwiftUIViewDemo: View {
    
    @State var page1 = 0
    @State var page2 = 0
    
    var body: some View {
        VStack {
            GeometryReader { proxy in
                Pager(page: self.$page1, data: Array(0..<10), id: \.self) { page in
                    VStack(spacing: 0) {
                        Color.orange
                            .overlay(Text("Parent Pager Page \(page)"))
                        Pager(page: self.$page2, data: Array(0..<5), id: \.self) { x in
                            Rectangle()
                                .foregroundColor(.red)
                                .padding()
                                .overlay(Text("SubView Pager Page \(x.description)"))
                        }
                            .itemSpacing(16)
                            .interactive(0.6)
                            .itemAspectRatio(1.0, alignment: .center)
                            .highPriorityGesture()
                            .swipeInteractionArea(.page)
                            .background(Color.blue)
                            .frame(width: proxy.size.width, height: proxy.size.width / 2)
                        
                        Color.orange
                    }
                }
                .itemSpacing(16)
                .interactive(0.6)
                .itemAspectRatio(1.0, alignment: .center)
                .swipeInteractionArea(.page)
            }
            
            HStack {
                ForEach(0 ..< 10, id: \.self) { page in
                    Circle()
                        .foregroundColor(page == self.page1 ? .black : .gray)
                        .frame(width: 15, height: 15)
                }
            }.opacity(0.5)
        }
    }
}

struct SwiftUIViewDemo_Previews: PreviewProvider {
    static var previews: some View {
        SwiftUIViewDemo()
    }
}