Скачать или смотреть How to Set a Custom UIView Frame in UIViewRepresentable for SwiftUI

Learn how to correctly set custom `UIView` frames in `UIViewRepresentable` with SwiftUI, ensuring your views display as intended with step-by-step guidance.
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This video is based on the question https://stackoverflow.com/q/62301450/ asked by the user 'IrelDev' ( https://stackoverflow.com/u/12517479/ ) and on the answer https://stackoverflow.com/a/62301587/ provided by the user 'Asperi' ( https://stackoverflow.com/u/12299030/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Setting a Custom UIView Frame in UIViewRepresentable for SwiftUI

SwiftUI is a powerful framework that allows you to build user interfaces using a declarative syntax. However, when it comes to bringing in traditional UIView components into your SwiftUI views, things can get a bit tricky, especially when it comes to sizing. In this guide, we will explore how to correctly set a custom UIView frame when using UIViewRepresentable in SwiftUI, ensuring that your UI behaves as expected.

The Problem

Many developers encounter a common issue: they want to integrate a custom UIView into their SwiftUI application but struggle to make it respect the frame size they set in SwiftUI. You might have tried implementing something like this:

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

And you may find that the UIView does not adhere to the frame settings unless you explicitly define its size in the UIViewRepresentable implementation. This can lead to frustration as you try to make your user interface look precise and well-organized.

Understanding UIViewRepresentable

The UIViewRepresentable protocol is designed to allow SwiftUI to use UIKit components. To properly implement it, you need to understand its two required methods: makeUIView(context:) and updateUIView(_:context:).
Here's a quick breakdown:

makeUIView(context:): This method is called to create the initial UIView. This is where you instantiate and configure your UIView or custom components.

updateUIView(_:context:): This method is called when the SwiftUI view’s state changes, allowing you to update your UIView accordingly.

The Solution: Setting the Frame Correctly

To solve the issue of not getting the correct frame size for your UIView, you don't need to set the frame directly inside the makeUIView function. Instead, set it to .zero and let SwiftUI handle the sizing based on its frame. Here's a step-by-step solution to achieve the desired layout:

Step 1: Implement the UIViewRepresentable

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

Step 2: Using the UIViewRepresentable in Your SwiftUI View

You can then use your MyViewRepresentable struct in your SwiftUI view like this:

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

What You Need to Know

No External Limitations: If your UIView is layouted correctly (considering its internal contents), using .zero in makeUIView will mean SwiftUI automatically sizes it as per the .frame() modifiers.

Layout Issues: If you find that your UIView does not display correctly, you might need to check the internal layout of your custom UIView to ensure it's set up to respond to its bounds properly.

Conclusion

Integrating UIKit’s UIView into SwiftUI requires some adjustments to frame management to ensure your views display correctly. By returning a view with a frame of .zero from makeUIView, you allow SwiftUI to handle sizing, resulting in a more integrated experience. With these adjustments, you can confidently create custom components within your SwiftUI applications that appear and behave just the way you want them. Happy coding!