another.im-ios/ConversationsClassic/View/UIToolkit/View+Loader.swift

import Foundation
import SwiftUI

public extension View {
    func loadingIndicator(_ isShowing: Bool) -> some View {
        modifier(LoadingIndicator(isShowing: isShowing))
    }
}

struct LoadingIndicator: ViewModifier {
    var isShowing: Bool

    func body(content: Content) -> some View {
        ZStack {
            content
            if isShowing {
                loadingView
            }
        }
    }

    private var loadingView: some View {
        GeometryReader { proxyReader in
            ZStack {
                Color.Material.Elements.active.opacity(0.3)
                    .frame(maxWidth: .infinity, maxHeight: .infinity)

                // loader
                ProgressView()
                    .progressViewStyle(
                        CircularProgressViewStyle(tint: .Material.Elements.active)
                    )
                    .position(x: proxyReader.size.width / 2, y: proxyReader.size.height / 2)
                    .controlSize(.large)
            }
        }
        .ignoresSafeArea()
        .transition(AnyTransition.opacity.animation(.easeInOut(duration: 0.1)))
    }
}