laevandus

let appFlowCoordinator = AppFlowCoordinator()
let rootView = RootView().environmentObject(appFlowCoordinator)
window.rootViewController = UIHostingController(rootView: rootView)

laevandus

struct LoginView: View {
    @EnvironmentObject var appFlowCoordinator: AppFlowCoordinator
    
    var body: some View {
        ZStack {
            Button(action: appFlowCoordinator.showMainView) {
                Text("Login")
            }
        }
    }

laevandus

struct RootView: View {
    @EnvironmentObject var appFlowCoordinator: AppFlowCoordinator
    
    @ViewBuilder
    var body: some View {
        ZStack {
            Color.black.edgesIgnoringSafeArea(.all)
            if appFlowCoordinator.activeFlow == .main {
                ContentView().transition(.asymmetric(insertion: .scale, removal: .opacity))
            }

laevandus

import SwiftUI

final class AppFlowCoordinator: ObservableObject {
    @Published var activeFlow: Flow = .login
    
    func showLoginView() {
        withAnimation {
            activeFlow = .login
        }
    }

laevandus

import SwiftUI

struct ContentView: View {
    @Environment(\.dependencyManager) var dependencyManager: DependencyManager
    
    var body: some View {
        Text(dependencyManager.identifier)
    }
}

laevandus

// Setting non-default instance of DependencyManager, otherwise default instance is used created in DependencyManagerKey
let dependencyManager = DependencyManager(identifier: "Scene delegate created")
let contentView = ContentView().environment(\.dependencyManager, dependencyManager)

laevandus

import Foundation
import SwiftUI

struct DependencyManager {
    let identifier: String
    let urlSession = URLSession.shared
}

struct DependencyManagerKey: EnvironmentKey {
    typealias Value = DependencyManager

laevandus

let textView = TokenTextView(frame: .zero)
textView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(textView)
NSLayoutConstraint.activate([
    textView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 16),
    textView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -16),
    textView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 16),
    textView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -16)
])
        

laevandus

final class TokenTextView: UITextView {
    init(frame: CGRect) {
        let layoutManager = TokenLayoutManager()
        let textStorage = NSTextStorage()
        textStorage.addLayoutManager(layoutManager)
        let textContainer = NSTextContainer()
        textContainer.heightTracksTextView = true
        textContainer.widthTracksTextView = true
        layoutManager.addTextContainer(textContainer)
        super.init(frame: frame, textContainer: textContainer)

laevandus

extension NSAttributedString.Key {
    static let token = NSAttributedString.Key("Token")
}

final class TokenLayoutManager: NSLayoutManager {
    var textContainerOriginOffset: CGSize = .zero
    
    override func drawGlyphs(forGlyphRange glyphsToShow: NSRange, at origin: CGPoint) {
        let characterRange = self.characterRange(forGlyphRange: glyphsToShow, actualGlyphRange: nil)
        textStorage?.enumerateAttribute(.token, in: characterRange, options: .longestEffectiveRangeNotRequired, using: { (value, subrange, _) in