Earlier we have been through various articles based on AnimatedBuilder Widget. So in this article, we will go through how to solve the named parameter ‘vsync’ isn’t defined?
How to solve the named parameter ‘vsync’ isn’t defined?
Make changes in your pubspec.yaml change this to :
environment: sdk: ">=2.8.0 <3.0.0"
and flutter pub gets in the android studio then invalidate the cache and restart.
A few things unfortunately not pinpointed that helps with issues like this:
- Run flutter upgrade
- Run flutter pub get
- Run flutter clean
- Restart IDE
Change flutter channel and in this case, change the minimum SDK version from 2.7.0 to 2.8.0. You can also try the below way:
- Step 1: Change the SDK version in the pubspec.yaml to 2.8.
- Step 2: After that run open terminal and run
- Step 3: After Step 2, get all the packages by running this command
flutter pub get
- Step 4: Then use this command to clean flutter
- Step 5: Close the IDE like VS Code, Android Studio, and then reopen it. That’s all !!
Now vsync will appear back again. Apart from vsync, the colors property in LinearGradient was also missing. And after we applied all these steps, the colors property along with vsync will reappear.
Keep Learning !!! Keep Fluttering !!!
So in this article, we have been through how to solve the named parameter ‘vsync’ isn’t defined?
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