How to Fix TappedCommand Not Triggering in Xamarin Forms Custom Control

Learn how to troubleshoot and fix the issue of `TappedCommand` not triggering in your Xamarin Forms custom control with our step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/72111422/ asked by the user 'Funky Sloth' ( https://stackoverflow.com/u/15368826/ ) and on the answer https://stackoverflow.com/a/72121499/ provided by the user 'ColeX' ( https://stackoverflow.com/u/8187800/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting TappedCommand Not Triggering in Xamarin Forms Custom Control

In your Xamarin Forms application, you might encounter a situation where a TappedCommand associated with a custom control does not trigger as expected. This can be frustrating, especially if you have carefully set up your bindable properties and commands. Let's dive deep into understanding the problem and providing a solution in a clear, organized manner.

The Problem

You have created a custom control named RateControl intended to handle rating selections using tap gestures. Despite initializing the OnRateSelectedCommand, the command is not being invoked when users tap the rating stars.

Key Observations

You have defined a BindableProperty for the rating.

You created a command but it fails to execute upon tapping the associated UI elements.

The XAML binding for the command appears set up correctly, but it does not work as intended.

The Solution

The root cause of why the TappedCommand is not triggering lies in the generic type used for the Command. Instead of using int, you should use string. Here’s how to fix the issue step-by-step:

Step 1: Update the Command Type

Change the OnRateSelectedCommand to accept a string parameter instead of an int. This matches how you will bind the command in XAML.

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

Step 2: Modify the Command Handling Method

Update the OnRateClicked method to accept a string parameter. You will then need to convert this string to an integer rating within the method.

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

Step 3: Update the XAML Binding

Modify the XAML code where the TappedCommand is defined. Remove the Source={x:Reference component} to bind directly since the BindingContext is already set to this within your control’s constructor.

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

Conclusion

By making these changes, you will ensure that your TappedCommand activates correctly when users tap on the rating stars within your custom control. Be sure to test the functionality after implementing these updates to confirm that the command triggers as expected.

Wrapping Up

With this guide, you can overcome the challenge of TappedCommand not triggering in your Xamarin Forms custom control. Always remember to check the types of parameters being passed and confirm that your bindings are set correctly for the intended behavior.

Don’t hesitate to reach out in the comments if you have further questions or run into additional issues! Happy coding!

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