How to Change the Grid Background Color in Xamarin.Forms with Tap Gesture

Learn how to dynamically change a `Grid` background color in Xamarin.Forms using gesture recognizers, while ensuring the previous selection resets to original color.
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This video is based on the question https://stackoverflow.com/q/66323520/ asked by the user 'signalover' ( https://stackoverflow.com/u/15210283/ ) and on the answer https://stackoverflow.com/a/66323608/ 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.

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Changing the Color of a Grid Background in Xamarin.Forms

If you're working on a Xamarin.Forms application and are looking to enhance user experience by allowing users to visually select items using taps, you might find yourself needing to change the background color of a Grid. This is especially useful when you want to highlight an item that a user has selected, providing immediate feedback. In this post, we will explore how to implement this functionality effectively, ensuring that only one Grid is highlighted at a time.

The Problem

In a CollectionView, you might want to implement a feature where the background color of a Grid changes upon user interaction, such as tapping a button. The challenge arises when you wish to revert the previous selection's background color back to its original state when another item is tapped. Without the proper setup, once a Grid changes its color, it might stay that way, leading to confusion for the user.

Initial Implementation

Consider the following basic XAML structure for the CollectionView:

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

In this setup, we define a TapGestureRecognizer that calls SelectedDate_Tapped when the Grid is tapped.

The Initial Code for Tapping

The corresponding C# code is simple:

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

While this allows the Grid to change colors, it does not provide any functionality to reset the color of the previously tapped Grid.

The Solution

To solve this problem, we need to track the last selected Grid so that we can revert its color when another Grid is tapped. Here’s how to achieve that:

Step 1: Declare a Variable for the Last Selected Grid

We need to keep a reference to the last tapped Grid. This can be done by declaring a variable:

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

Step 2: Update the Tapped Method

Next, modify your SelectedDate_Tapped method to include logic for reverting the color of the previously tapped Grid:

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

In the above code, myDefaultColor should be replaced with the original color value you want to revert to (e.g., Color.Transparent).

Recap

Track Last Selected Grid: Keep a reference to the last Grid tapped.

Update Colors: Change the background color on tap and revert the previous one to its default color.

Simple Code Implementation: Use straightforward code to ensure clarity and maintainability.

Conclusion

By following these steps, you can create a more interactive and user-friendly experience in your Xamarin.Forms application. Users will appreciate clear feedback when selecting items, enhancing navigation and selection processes. If you haven't implemented this functionality yet, now's a great time to do so!

By using this approach, you will successfully manage the background color of Grid views in a CollectionView, ensuring that only one item is highlighted at a time, maintaining clarity and improving overall UX.

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