Correctly round corners of My Profile tab icon

Tusker/Screens/Profile/MyProfileViewController.swift

@@ -21,19 +21,8 @@ class MyProfileViewController: ProfileViewController {
             
             DispatchQueue.main.async {
                 self.accountID = account.id
+                self.setAvatarTabBarImage()
             }
-            
-            _ = ImageCache.avatars.get(account.avatar, completion: { [weak self] (data) in
-                guard let self = self, let data = data, let image = UIImage(data: data) else { return }
-                DispatchQueue.main.async {
-                    let size = CGSize(width: 30, height: 30)
-                    let tabBarImage = UIGraphicsImageRenderer(size: size).image { (_) in
-                        image.draw(in: CGRect(origin: .zero, size: size))
-                    }
-                    let alwaysOriginalImage = tabBarImage.withRenderingMode(.alwaysOriginal)
-                    self.tabBarItem.image = alwaysOriginalImage
-                }
-            })
         }
     }
     
@@ -45,8 +34,38 @@ class MyProfileViewController: ProfileViewController {
         super.viewDidLoad()
 
         navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Preferences", style: .plain, target: self, action: #selector(preferencesPressed))
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(preferencesChanged), name: .preferencesChanged, object: nil)
     }
     
+    private func setAvatarTabBarImage() {
+        guard let id = mastodonController.account?.id,
+           let account = mastodonController.persistentContainer.account(for: id) else {
+            return
+        }
+        
+        _ = ImageCache.avatars.get(account.avatar, completion: { [weak self] (data) in
+            guard let self = self, let data = data, let image = UIImage(data: data) else { return }
+            DispatchQueue.main.async {
+                let size = CGSize(width: 30, height: 30)
+                let rect = CGRect(origin: .zero, size: size)
+                let tabBarImage = UIGraphicsImageRenderer(size: size).image { (_) in
+                    let radius = Preferences.shared.avatarStyle.cornerRadiusFraction * 30
+                    UIBezierPath(roundedRect: rect, cornerRadius: radius).addClip()
+                    image.draw(in: rect)
+                }
+                let alwaysOriginalImage = tabBarImage.withRenderingMode(.alwaysOriginal)
+                self.tabBarItem.image = alwaysOriginalImage
+            }
+        })
+    }
+    
+    @objc private func preferencesChanged() {
+        setAvatarTabBarImage()
+    }
+    
+    // MARK: - Interaction
+    
     @objc func preferencesPressed() {
         present(PreferencesNavigationController(mastodonController: mastodonController), animated: true)
     }