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Learn how to configure your UISplitViewController in Storyboard to display the master view first when your iOS app starts.
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This video is based on the question https://stackoverflow.com/q/65569501/ asked by the user 'meaning-matters' ( https://stackoverflow.com/u/1971013/ ) and on the answer https://stackoverflow.com/a/65569921/ provided by the user 'Pranav Kasetti' ( https://stackoverflow.com/u/4995828/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Make UISplitViewController Show Master View First on Startup

When developing an iOS app that utilizes the UISplitViewController, you might encounter an issue where the detail view appears first, especially when running the app on an iPhone simulator. This behavior can be counterintuitive, particularly for master-detail user interfaces where it’s often expected that the master view displays at startup. Fortunately, with some adjustments in your code, you can ensure that the master view shows first every time your app launches. Let’s explore how to solve this problem effectively.

Understanding the UISplitViewController Behavior

A UISplitViewController provides a convenient way to manage a primary (master) and a secondary (detail) view controller. In most cases, for apps designed for iPads, the master view naturally appears to the left, showcasing a list of items, while the detail view occupies the right side.

However, when viewed on an iPhone, the default behavior may cause the detail view to be displayed first, which can lead to a less intuitive user experience. To align your app's behavior with user expectations, you need to modify the default settings of your UISplitViewController.

Steps to Show Master View First

Follow these steps to modify your UISplitViewController implementation in Swift so that the master view displays first on app startup:

1. Create a Custom SplitViewController Class

Create a subclass of UISplitViewController. This will allow you to implement the necessary delegate methods.

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2. Implement the Delegate Methods

Add the UISplitViewControllerDelegate to your split view controller class, and implement the required methods to control the display behavior.

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3. Update for Backward Compatibility

While the code provided is suitable for iOS 14 and later, the behavior also needs to be preserved for earlier iOS versions. The implementations you’ve just added should be compatible, but always test your application across multiple iOS versions to ensure no issues arise.

4. Avoid Deprecated Methods

In previous versions of iOS, developers might have used preferredDisplayMode = .primaryOverlay to manage the display settings. However, note that this method is now deprecated. It’s best to rely on the code shown above for effective implementation moving forward.

Conclusion

By following these steps, you can effectively configure your UISplitViewController to ensure that the master view is displayed first upon app startup. This approach not only improves usability but also aligns the app behavior with common user expectations in master-detail layouts. Whether you’re building a new app or refining an existing one, implementing these changes is straightforward and beneficial.

Keep exploring the endless possibilities that iOS development offers and remember—it’s all about creating the best user experience possible!