To enable navigation, persistently highlight the current selection in each pane that leads to the detail view.
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In a compact environment, such as iPhone in portrait orientation, it’s difficult to display multiple panes without wrapping or truncating the content, making it less legible and harder to interact with. A split view needs horizontal space in which to display multiple panes. Prefer using a split view in a regular - not a compact - environment. Rarely, you might also use a split view to provide groups of functionality that supplement the primary view - for example, Keynote in macOS uses split view panes to present the slide navigator, the presenter notes, and the inspector pane in areas that surround the main slide canvas. For example, Mail in iPadOS lists accounts and mailboxes in the primary pane, a selected mailbox’s messages in the secondary pane, and a selected email in the tertiary pane. It’s common to use a split view to create a sidebar interface, where the leading pane lists the top-level items or collections in an app, and the secondary and optional tertiary panes can present child collections and item details. Similarly, a split view can display a tertiary pane if items in the secondary pane contain additional content.
![ios split screen ios split screen](https://www.geeky-gadgets.com/wp-content/uploads/2014/06/ios-841.jpg)
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In this scenario, selecting an item in the view’s primary pane displays the item’s contents in the secondary pane. Typically, you use a split view to support navigation through a hierarchy of information. A split view manages the presentation of multiple adjacent panes of content, each of which can contain a variety of components, including tables, collections, images, and custom views.