Basic animation to show/hide 💊 (IOS-234)

Mastodon/Scene/HomeTimeline/HomeTimelineViewController.swift

@@ -100,6 +100,9 @@ final class HomeTimelineViewController: UIViewController, NeedsDependency, Media
     
     let refreshControl = RefreshControl()
     let timelinePill = TimelineStatusPill()
+    var timelinePillCenterXAnchor: NSLayoutConstraint?
+    var timelinePillVisibleTopAnchor: NSLayoutConstraint?
+    var timelinePillHiddenTopAnchor: NSLayoutConstraint?
 
 
     private func generateTimeSelectorMenu() -> UIMenu {
@@ -299,17 +302,24 @@ extension HomeTimelineViewController {
             }
             .store(in: &disposeBag)
 
-//        timelinePill.translatesAutoresizingMaskIntoConstraints = false
-//        view.addSubview(timelinePill)
-//
-//        // has to up updated and animated
-//        timelinePill.update(with: .postSent)
-//        NSLayoutConstraint.activate([
-//            timelinePill.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 8),
-//            timelinePill.centerXAnchor.constraint(equalTo: view.centerXAnchor),
-//        ])
+        timelinePill.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(timelinePill)
+
+        let timelinePillCenterXAnchor = timelinePill.centerXAnchor.constraint(equalTo: view.centerXAnchor)
+        let timelinePillVisibleTopAnchor = timelinePill.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 8)
+        let timelinePillHiddenTopAnchor = view.safeAreaLayoutGuide.topAnchor.constraint(equalTo: timelinePill.bottomAnchor, constant: 8)
+
+        NSLayoutConstraint.activate([
+            timelinePillHiddenTopAnchor, timelinePillCenterXAnchor
+        ])
+
+        timelinePill.addTarget(self, action: #selector(HomeTimelineViewController.timelinePillPressed(_:)), for: .touchUpInside)
+
+        self.timelinePillCenterXAnchor = timelinePillCenterXAnchor
+        self.timelinePillVisibleTopAnchor = timelinePillVisibleTopAnchor
+        self.timelinePillHiddenTopAnchor = timelinePillHiddenTopAnchor
     }
-    
+
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
         
@@ -459,6 +469,42 @@ extension HomeTimelineViewController {
         }
     }
 
+    @objc private func timelinePillPressed(_ sender: TimelineStatusPill) {
+        guard let reason = sender.reason else { return }
+        switch reason {
+        case .newPosts:
+            print("Bring me to the new posts and disappear")
+        case .postSent:
+            print("Bring me to my post and disappear")
+        case .offline:
+            print("Just disappear")
+        }
+
+        hideTimelinePill()
+    }
+
+    private func showTimelinePill() {
+        guard let timelinePillHiddenTopAnchor, let timelinePillVisibleTopAnchor else { return }
+
+        NSLayoutConstraint.deactivate([timelinePillHiddenTopAnchor])
+        NSLayoutConstraint.activate([timelinePillVisibleTopAnchor])
+
+        UIView.animate(withDuration: 0.4) {
+            self.view.layoutIfNeeded()
+        }
+    }
+
+    private func hideTimelinePill() {
+        guard let timelinePillHiddenTopAnchor, let timelinePillVisibleTopAnchor else { return }
+
+        NSLayoutConstraint.deactivate([timelinePillVisibleTopAnchor])
+        NSLayoutConstraint.activate([timelinePillHiddenTopAnchor])
+
+        UIView.animate(withDuration: 0.4, animations: {
+            self.view.layoutIfNeeded()
+        })
+    }
+
 }
 // MARK: - UIScrollViewDelegate
 extension HomeTimelineViewController {

Mastodon/Scene/HomeTimeline/TimelineStatusPill.swift

@@ -5,32 +5,34 @@ import MastodonAsset
 
 class TimelineStatusPill: UIButton {
 
-    func update(with state: State) {
+    var reason: Reason?
+
+    func update(with reason: Reason) {
+        self.reason = reason
         var configuration = UIButton.Configuration.filled()
 
-
         configuration.attributedTitle = AttributedString(
-            state.title, attributes: AttributeContainer(
+            reason.title, attributes: AttributeContainer(
                 [
                     .font: UIFontMetrics(forTextStyle: .subheadline).scaledFont(for: .systemFont(ofSize: 15, weight: .bold)),
                     .foregroundColor: UIColor.white
                 ]
             ))
 
-        let image = state.image?
+        let image = reason.image?
             .withConfiguration(UIImage.SymbolConfiguration(paletteColors: [.white]))
             .withConfiguration(UIImage.SymbolConfiguration(textStyle: .subheadline))
             .withConfiguration(UIImage.SymbolConfiguration(pointSize: 12, weight: .bold, scale: .medium))
 
         configuration.image = image
         configuration.imagePadding = 8
-        configuration.baseBackgroundColor = state.backgroundColor
+        configuration.baseBackgroundColor = reason.backgroundColor
         configuration.cornerStyle = .capsule
 
         self.configuration = configuration
     }
 
-    public enum State {
+    public enum Reason {
         case newPosts
         case postSent
         case offline