import SwiftUI

struct ContentView: View {
    @State var selectedTag = 1

var body: some View {
  TabView(selection: $selectedTag) {
  HomeTabView().tag(1)
   WeatherTabView().tag(2)
   NewsTabView().tag(3)
    NewsTabView2().tag(4)
     NewsTabView3().tag(5)
 }
    .tabViewStyle(PageTabViewStyle())
    .ignoresSafeArea()
  }
}

struct HomeTabView: View {
   var body: some View {
     VStack {
      Image(systemName: "music.note.house")
        .scaleEffect(x: 3.0, y: 3.0)
       .frame(width: 100, height: 100)
    Text("HOME").font(.system(size: 40))
 }
     .frame(maxWidth: .infinity, maxHeight: .infinity)
     .background(Color(red: 0.5, green: 0.9, blue: 0.9))
    .ignoresSafeArea()
 }
}

struct WeatherTabView: View {
    var body: some View {
      VStack {
         Image(systemName: "cloud.sun")
          .scaleEffect(x: 3.0, y: 3.0)
           .frame(width: 100, height: 100)
          Text("Weather").font(.system(size: 40))
 }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
    .background(Color(red: 1.0, green: 0.9, blue: 1.0))
    .ignoresSafeArea()
   }
}

struct NewsTabView: View {
var body: some View {
     VStack {
        Image(systemName: "newspaper")
        .scaleEffect(x: 3.0, y: 3.0)
         .frame(width: 100, height: 100)
       Text("News").font(.system(size: 40))
 }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
    .background(Color(red: 0.9, green: 0.9, blue: 0.8))
    .ignoresSafeArea()
 }
}

struct NewsTabView2: View {
  @State var isShowSubViw = false
    var body: some View {
       GeometryReader { geometory in
     ZStack {
        VStack {
        Image(systemName: "ant.circle.fill")
         .scaleEffect(x: 3.0, y: 3.0)
         .frame(width: 100, height: 100)
          Text("NewsTabView2")
          .font(.system(size: 40, weight: .black, design: .default))
         .padding(.top, -20)
 }
   if isShowSubViw {
          SubView()
      } else {
         Button(action: {
         withAnimation() {
          self.isShowSubViw.toggle()
      }
}) {
     Text("SubViewへ遷移")
         .padding(.top, 200)
         }
       }
  }
      .frame(width: geometory.size.width,
        height: geometory.size.height)
         .background(Color.green)
          .animation(.easeInOut(duration: 0.42))
      }
       .transition(.move(edge: .leading))
  }
 }

struct SubView: View {
  @State var isShowSubViw = false
    var body: some View {
      GeometryReader { geometory in
       ZStack {
        if isShowSubViw {
            NewsTabView2()
        } else {
            Button(action: {
            withAnimation() {
             self.isShowSubViw.toggle()
         }
     }) {
      Text("NewsTabView2へ戻る")
       }
   .padding(.top, 100)
        VStack {
        Text("SubView")
       .font(.system(size: 40, weight: .black, design: .default))
 }
  }
    .frame(width: geometory.size.width,
       height: geometory.size.height)
    .background(
       LinearGradient(
      gradient: Gradient(colors: [Color.yellow, Color.red]),
       startPoint: .init(x: 0.3, y: 0.3),    // start地点
      endPoint: .init(x: 0.55, y: 0.55)     // end地点 。
 ))
   .animation(.easeInOut(duration: 0.42))
 }
   .transition(.move(edge: .leading))
}
}

struct NewsTabView3: View {
    @State var isShow: Bool = false
    var body: some View {
     VStack {
       Image(systemName: "ladybug.fill")
         .scaleEffect(x: 3.0, y: 3.0)
         .frame(width: 100, height: 100)
 Text("First View").font(.system(size: 30))
     .padding(.bottom, 30)
      Button(action: {
     withAnimation {
       self.isShow.toggle()
 }
  }) {
   Text("Second View pageへ").font(.system(size: 20))
 }
   .fullScreenCover(isPresented: $isShow){
    SomeView(isPresented: $isShow)  // SomeViewビューを表示する
   }
 }
 .frame(maxWidth: .infinity, maxHeight: .infinity)
 .background(Color.yellow)
  .ignoresSafeArea()
 }
}

struct SomeView: View {
    // ContentViewビューの変数isShowとバインディングする
    @Binding var isPresented: Bool
 var body: some View {
    NavigationView {
    VStack {
         Image(systemName: "ladybug").scaleEffect(2.0)
        Text("Second View").font(.title2).padding()
   }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
.background(
       LinearGradient(
         gradient: Gradient(colors: [Color.yellow, Color.green]),
          startPoint: .init(x: 0.3, y: 0.3),    // start地点
           endPoint: .init(x: 0.55, y: 0.55)     // end地点
      ))
.toolbar {
   ToolbarItem(placement: .navigationBarLeading) {
     Button {
       isPresented = false
  } label: {
     HStack {
         Image(systemName:"lessthan")
          .foregroundColor(.green)
          Text("First Viewへ戻る")
          .foregroundColor(Color.green)
      }
   }
  }
  }
  }
 }
}
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}