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Learn how to effectively change the frame of an `SCNView` in Xcode SceneKit without creating a new instance. Practical tips and explanations included!
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This video is based on the question https://stackoverflow.com/q/65622924/ asked by the user 'Wendell' ( https://stackoverflow.com/u/9948663/ ) and on the answer https://stackoverflow.com/a/65803845/ provided by the user 'Wendell' ( https://stackoverflow.com/u/9948663/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Change the SCNView Frame in Xcode SceneKit

If you’re working with Xcode and SceneKit, you might encounter a common challenge: the inability to change the frame size of an SCNView once it has been added as a subview. This can be frustrating, especially when you want to dynamically adjust the scene's display area during your app’s runtime. In this guide, we’ll delve into why this happens and how you can resolve the issue effectively.

Understanding the Problem

When you initialize an SCNView and add it to a parent view, altering the sceneView variable to a new frame doesn’t automatically update the view in the hierarchy. You might think updating the frame directly would suffice, but that’s not how it works in practice.

Here's an example of the initialization code you may have used to set up your SCNView:

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In this snippet, the SCNView is correctly created and added to your main view. However, if you attempt to change its frame later with:

[[See Video to Reveal this Text or Code Snippet]]

You’ll find that the view does not resize as intended. The problem lies in how views are managed in the iOS view hierarchy.

The Solution

To address this issue, we need to understand that simply reassigning the sceneView variable to a new instance of SCNView does not affect the already added view. Instead, you should modify the existing view’s properties directly or remove it and add a new one. Below are effective methods to adjust the SCNView frame without creating an entirely new instance each time.

1. Changing the Frame Directly

The frame property of a view is mutable, which means you can change it directly without needing to create a new instance. Here’s how you can do it:

[[See Video to Reveal this Text or Code Snippet]]

When you update the frame in this way, the view will reposition and resize itself based on the new dimensions.

2. Using Auto Layout

If your project leverages Auto Layout, you can also modify constraints instead of directly changing the frame. For example, if you have constraints set up for your SCNView, adjust those constraints to reflect the desired dimensions and positions. Auto Layout will take care of updating the view size accordingly.

Here's a quick example:

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3. Adding and Removing Subviews

If the need arises to completely change your SCNView instance due to irreconcilable changes, remove the old view and add a new one:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Changing the frame of an SCNView in Xcode SceneKit requires a proper understanding of how the view hierarchy works in iOS. By directly modifying the frame property or using Auto Layout, you can effectively manage your views without the overhead of re-instantiation. This not only keeps your application responsive but also ensures a seamless user experience.

Next time you find yourself struggling with SCNView frame changes, remember these strategies to make your life a little easier. Happy coding!