Скачать или смотреть How to Set the Initial Tab in Xamarin.CommunityToolkit's TabView?

Learn how to change the initial tab in Xamarin Community Toolkit's TabView. This guide provides a step-by-step solution suitable for beginners in C# and Xamarin.
---
This video is based on the question https://stackoverflow.com/q/71639603/ asked by the user 'Riley' ( https://stackoverflow.com/u/18574951/ ) and on the answer https://stackoverflow.com/a/71640194/ provided by the user 'Jason' ( https://stackoverflow.com/u/1338/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: I cannot seem to change the order of Xamarin.CommunityToolkit TabView tabs. Is there a way to do this?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Set the Initial Tab in Xamarin.CommunityToolkit's TabView?

If you're a beginner diving into C# and Xamarin, you may find yourself facing various challenges while developing your applications. One common question among developers working with the Xamarin.CommunityToolkit's TabView is how to change the order of tabs and make the application open directly on a specific tab. If you are building an app, such as a Snapchat-style application, you might prefer starting your app on the second tab instead of the default first one. In this guide, we'll explore how to accomplish this effectively.

Understanding the Problem

In your XAML file, you might have structured your TabView as follows:

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

You would think that assigning a value to each tab could help set the starting tab. However, efforts to change the initial display tab often don't align with the functionality provided by the Community Toolkit. Trying properties such as TabIndex does not correlate directly with the TabView functionality.

The Solution: Setting the Initial Tab in Code

To accomplish your goal of displaying the middle tab initially, you will need to configure this in the code-behind rather than just through the XAML. Here’s how to do it step-by-step:

Step 1: Name Your TabView

The first step is to give your TabView a name to refer to it in your code more easily. You can do this by adding the x:Name attribute to your TabView. Modify your XAML like this:

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

Step 2: Set the Selected Index in the Code-Behind

Next, navigate to the code-behind file (typically a .xaml.cs file) of your page. Here, you can set the initially selected tab by using the SelectedIndex property of your TabView. You can achieve this in the OnAppearing method, which runs every time your page appears. Here’s an example of what that code looks like:

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

Final Thoughts

Now you've successfully instructed your app to open on the middle tab instead of the default first tab. By utilizing code-behind, you can fine-tune your Xamarin application’s behavior and ensure users land where you want them to.

By following this guide, you should be able to overcome the challenge of setting a specific initial tab in Xamarin.CommunityToolkit’s TabView. This solution demonstrates the importance of combining XAML with code-behind for greater control over your application’s user interface. Happy coding!