Why Your Icon Is Not Changing on onPressed in Flutter: A Simple Fix

Discover the common mistake that prevents your Flutter `IconButton` from updating its icon upon press. Learn the correct operator to use and get your project back on track!
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This video is based on the question https://stackoverflow.com/q/69293208/ asked by the user 'Samuella M. Aglago' ( https://stackoverflow.com/u/16584823/ ) and on the answer https://stackoverflow.com/a/69293247/ provided by the user 'Abbasihsn' ( https://stackoverflow.com/u/10866453/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Why Your Icon Is Not Changing on onPressed in Flutter: A Simple Fix

Working on a Flutter project can sometimes lead to unexpected hurdles, and one frustrating issue developers encounter is when an Icon does not change as expected when using an IconButton. This problem can stall your progress and leave you scratching your head as to what went wrong. If you've printed messages to the console but the icon remains unchanged, you're not alone! Let’s break down this issue and explore how to solve it.

Understanding the Problem

In your provided code, the IconButton is designed to toggle between two icons: a play icon and a pause icon. However, even though you see a print statement in the console confirming the button press, the icon itself does not change. This unexpected behavior can be attributed to a common mistake in Dart's syntax that many developers encounter.

Quick Reflection on the Code

Here’s a snippet of the core issue in your code:

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

In the code above, the lines where you're trying to change the value of play are using ==, which is the equality operator. This operator checks if two values are equal, rather than setting a new value.

The Solution: Use the Correct Operator

The fix for this problem is straightforward. You need to replace the == operator, which checks for equality, with the = operator, which is used for assignment. Here's how to properly implement the onPressed function:

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

Updated Code Example

Here’s your complete code with the necessary changes applied to ensure the icon toggles correctly:

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

Conclusion

In summary, the issue with your icon not changing in the IconButton was due to the usage of the equality operator == instead of the assignment operator =. This small but critical mistake is easy to overlook, especially when you’re focused on more intricate aspects of your Flutter application.

Now that you've pinpointed the problem and learned how to fix it, you can continue developing your project without any further hiccups. Happy coding!

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