```swift
import SwiftUI

struct ContentView: View {
    
    @State var breatheOut = false
    @State var breatheIn = true
    
    var body: some View {
        
        ZStack {
            
            Color.black
                    .edgesIgnoringSafeArea(.all)
            
            Text("Breathe In")
                .foregroundColor(.white)
                .opacity(breatheIn ? 0 : 1)
                .scaleEffect(breatheIn ? 0 : 1, anchor: .center)
                .animation(Animation.easeInOut(duration: 4)
                            .delay(0.75)
                            .repeatForever(autoreverses: true))
                .onAppear {
                    breatheIn.toggle()
                }
            
            Text("Breathe Out")
                .foregroundColor(.white)
                .opacity(breatheOut ? 0 : 1)
                .animation(Animation.easeInOut(duration: 4)
                            .delay(0.75)
                            .repeatForever(autoreverses: true))
                .onAppear {
                    breatheOut.toggle()
                }
                
        }
        
    }
}

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


```

![画面収録 2021-05-09 11 05 08 2021-05-09 11_09_04](https://user-images.githubusercontent.com/871484/117558312-4d75c680-b0b7-11eb-9e45-616a3cabc9c5.gif)