Counter animation. Demo: https://imgur.com/a/3tEx6B9

CounterAnimationSample.swift

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
    @State var number: Int = 1
    @State var dummyFlag: Bool = true
    @State var isIncrement: Bool = false // forgive me for this, this is just for demonstration. Surely there are better ways
    
    var body: some View {
        Rectangle()
            .frame(width: 300, height: 50)
            .foregroundColor(.white)
            .overlay {
                HStack {
                    Text("-")
                        .foregroundColor(.red)
                        .onTapGesture {
                            isIncrement = false
                            withAnimation(.easeInOut(duration: 0.2)) {
                                dummyFlag.toggle()
                            }
                            DispatchQueue.main.asyncAfter(deadline: .now() + 0.1, execute: {
                                number -= 1
                            })
                        }
                    
                    textView
                    
                    Text("+")
                        .foregroundColor(.blue)
                        .onTapGesture {
                            isIncrement = true
                            withAnimation(.easeInOut(duration: 0.2)) {
                                dummyFlag.toggle()
                            }
                            DispatchQueue.main.asyncAfter(deadline: .now() + 0.1, execute: {
                                number += 1
                            })
                        }
                }
            }
    }
    
    @ViewBuilder
    private var textView: some View {
        Group {
            if dummyFlag {
                Text("\(number)")
            } else {
                Text("\(number)")
            }
        }
        .monospaced()
        .frame(maxHeight: .infinity)
        .transition(.asymmetric(insertion: isIncrement ? .push(from: .bottom) : .push(from: .top), removal: isIncrement ? .move(edge: .top) : .move(edge: .bottom)))
    }
}

PlaygroundPage.current.setLiveView(ContentView())