Just a reminder for myself. How to fold and unfold code in XCode:

• ⌘ + ⌥ + ⇧ + ← fold all methods in file.
• ⌘ + ⌥ + ⇧ + → unfold all methods in file.
• ⌘ + ⌥ + ← fold block underneath the cursor.
• ⌘ + ⌥ + → unfold block underneath the cursor.