macOS Split View
macOS Split View puts two or more panes side by side. A draggable divider gives more room to one pane and less to another without covering either one.
Map states and behavior before polishing.
A real example
A code editor lets someone widen the file tree. The editor pane gets smaller but stays usable.
Main parts
- 01Simultaneously visible pane regions
- 02Draggable split divider
- 03Per-pane minimum dimensions
- 04Allocated pane proportions
Use it when
Use it when nearby panes must stay visible together. Let people divide space among menus, content, or details.
Do not use it when
Avoid it when one pane is only temporary. Each pane must keep a useful minimum size. Resizing must not make either task unusable.
Name used in code
AppKit NSSplitView / SwiftUI HSplitView or VSplitView Before you ship
Check the supported macOS versions and AppKit or SwiftUI integration. Check standard focus and keyboard behavior. Also check VoiceOver, Full Keyboard Access, window resizing, and multi-window state. When needed, check restore, localization, and reduced motion.
Outcome: Apply or review macOS Split View in a native macOS app without breaking platform rules. User context: A code editor lets someone widen the file tree. The editor pane gets smaller but stays usable. macOS concept or control: macOS Split View. Why it fits: Use it when nearby panes must stay visible together. Let people divide space among menus, content, or details. Do not use it when: Avoid it when one pane is only temporary. Each pane must keep a useful minimum size. Resizing must not make either task unusable. Platform requirements: List the supported macOS versions. Say whether AppKit or SwiftUI owns each part and how they connect. Define window, menu, focus, keyboard, saved state, restore, and multi-window behavior. Platform accessibility and resilience: Use the right accessibility APIs. Check VoiceOver and Full Keyboard Access. Support localization, contrast, and reduced motion when needed. Keep user state after a relaunch. Acceptance criteria: Check the behavior on supported macOS versions with a keyboard and VoiceOver. Window resizing, focus, state restore, and AppKit or SwiftUI integration work in the normal macOS way. Evidence and limits (evidence boundary): It is official for that source. Other platforms or teams may use the term in another way. Unknowns to confirm: Supported macOS versions, AppKit or SwiftUI structure, and window model. Also confirm sandbox and entitlement limits, save rules, and the accessibility goal.
Check this request
Review the current use of macOS Split View. Definition: macOS Split View puts two or more panes side by side. A draggable divider gives more room to one pane and less to another without covering either one. Release checks: Check the supported macOS versions and AppKit or SwiftUI integration. Check standard focus and keyboard behavior. Also check VoiceOver, Full Keyboard Access, window resizing, and multi-window state. When needed, check restore, localization, and reduced motion. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.