LoadingViewTutorial

import SwiftUI

struct LoadingView<Content>: View where Content: View {

    @Binding var isShowing: Bool
    var content: () -> Content
    var text: String?

    var body: some View {
        GeometryReader { geometry in
            ZStack(alignment: .center) {
                content()
                    .disabled(isShowing)
                    .blur(radius: isShowing ? 2 : 0)
                    
                if isShowing {
                    Rectangle()
                        .fill(Color.black).opacity(isShowing ? 0.6 : 0)
                        .edgesIgnoringSafeArea(.all)

                    VStack(spacing: 48) {
                        ProgressView().scaleEffect(2.0, anchor: .center)
                        Text(text ?? "Loading...").font(.title).fontWeight(.semibold)
                    }
                    .frame(width: 250, height: 200)
                    .background(Color.white)
                    .foregroundColor(Color.primary)
                    .cornerRadius(16)
                }
            }
        }
    }
}

struct ContentView: View {
    
    @State var loadingViewShowing = false
    
    var body: some View {
        LoadingView(isShowing: $loadingViewShowing) {
            Button(action: {
                loadingViewShowing = true
                // mock some network request or other task
                DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
                    loadingViewShowing = false
                }
            }, label: {
                Text("Tap Me!")
            })
        }
    }
}