Add title and subtitle (#540)

Mastodon/Scene/Onboarding/Login/MastodonLoginView.swift

@@ -10,18 +10,39 @@ import MastodonAsset
 
 class MastodonLoginView: UIView {
 
-  // Title, Subtitle
   // SearchBox, queries api.joinmastodon.org/servers with domain
   // List with (filtered) domains
 
+  let titleLabel: UILabel
+  let subtitleLabel: UILabel
+  private let headerStackView: UIStackView
   let navigationActionView: NavigationActionView
 
   override init(frame: CGRect) {
+
+    titleLabel = UILabel()
+    titleLabel.font = MastodonLoginViewController.largeTitleFont
+    titleLabel.textColor = MastodonLoginViewController.largeTitleTextColor
+    titleLabel.text = "Welcome Back" //TODO: @zeitschlag localization
+    titleLabel.numberOfLines = 0
+
+    subtitleLabel = UILabel()
+    subtitleLabel.font = MastodonLoginViewController.subTitleFont
+    subtitleLabel.textColor = MastodonLoginViewController.subTitleTextColor
+    subtitleLabel.text = "Log you in with the server where you created your account" //TODO: @zeitschlag localization
+    subtitleLabel.numberOfLines = 0
+
+    headerStackView = UIStackView(arrangedSubviews: [titleLabel, subtitleLabel])
+    headerStackView.axis = .vertical
+    headerStackView.spacing = 16
+    headerStackView.translatesAutoresizingMaskIntoConstraints = false
+
     navigationActionView = NavigationActionView()
     navigationActionView.translatesAutoresizingMaskIntoConstraints = false
 
     super.init(frame: frame)
 
+    addSubview(headerStackView)
     addSubview(navigationActionView)
     backgroundColor = .systemBackground
 
@@ -34,6 +55,11 @@ class MastodonLoginView: UIView {
 
   private func setupConstraints() {
     let constraints = [
+
+      headerStackView.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor),
+      headerStackView.leadingAnchor.constraint(equalTo: readableContentGuide.leadingAnchor),
+      headerStackView.trailingAnchor.constraint(equalTo: readableContentGuide.trailingAnchor),
+
       navigationActionView.leadingAnchor.constraint(equalTo: leadingAnchor),
       navigationActionView.trailingAnchor.constraint(equalTo: trailingAnchor),
       bottomAnchor.constraint(equalTo: navigationActionView.bottomAnchor),

Mastodon/Scene/Onboarding/Login/MastodonLoginViewController.swift

@@ -43,6 +43,7 @@ class MastodonLoginViewController: UIViewController {
   override func viewDidLoad() {
     super.viewDidLoad()
 
+    defer { setupNavigationBarBackgroundView() }
     setupOnboardingAppearance()
   }