SwiftUI_MyModifier_ButtonSegue

gistfile1.txt

import SwiftUI

struct ContentView: View {
    var body: some View {
        GeometryReader { geometry in
            NavigationView {
                ZStack {
                    VStack {
                        Text("Something")
                            .modifier(MyModifier(color: .yellow,
                                                 frameSizeHeight: 40,
                                                 frameSizeWidth: 100, // frmae is size
                                verticalSet: .top, // originY
                                horizontalSet: .none, // originX
                                verticalSize: -80, // originY size
                                horizontalSize: 0))
                        Text("Something").modifier(
                            MyModifier(color: .yellow,
                                       frameSizeHeight: UIScreen.main.bounds.height,
                                       frameSizeWidth: UIScreen.main.bounds.width,
                                       verticalSet: .none,
                                       horizontalSet: .none,
                                       verticalSize: 0,
                                       horizontalSize: 0))
                            .padding(.horizontal)
                        
                    }
                    CommonButton(0)
                }
            }
        }
    }
}

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

struct SecondView: View {
    var body: some View {
        Text("画面遷移できました")
    }
}

struct MyModifier: ViewModifier {
    var color           : Color? = nil
    var frameSizeHeight : CGFloat? = nil
    var frameSizeWidth  : CGFloat? = nil
    var frameSize       : CGFloat? = nil
    var verticalSet     : Edge.Set? = nil
    var horizontalSet   : Edge.Set? = nil
    var verticalSize    : CGFloat? = nil
    var horizontalSize  : CGFloat? = nil
    
    func body(content: Content) -> some View {
        return content
            .frame(maxWidth: frameSizeWidth, maxHeight: frameSizeHeight)
            .background(color)
            .padding(verticalSet ?? Edge.Set.init(rawValue: 0), verticalSize ?? 0.0)
            .padding(horizontalSet ?? Edge.Set.init(rawValue: 0), horizontalSize ?? 0.0)
    }
}

struct CommonButton: View {
    
    var id: Int?
    @State var tag: Int?
    @State var destination: AnyView?
    
    init(_ id: Int) {
        self.id = id
    }
    
    var body: some View {
        VStack {
            Spacer()
            Button(action: {
                if self.id == 0 {
                    self.tag = 0
                    self.destination = AnyView(SecondView())
                }
            }) {
                Text("次へ")
                    .frame(minWidth: 0, maxWidth: .infinity, maxHeight: 64)
                    .foregroundColor(Color.red)
            }
            .background(Color.gray)
            .padding(.horizontal)
            NavigationLink(destination: self.destination, tag: self.tag ?? 0, selection: $tag) {
                EmptyView()
            }
        }
    }
}