Improve message for assert that catches CupertinoSwitch(value: null)
#12948
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c: crash
Stack traces logged to the console
f: cupertino
flutter/packages/flutter/cupertino repository
framework
flutter/packages/flutter repository. See also f: labels.
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Where there any analyzer warnings? |
CupertinoSwitch(value: null)
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(We should probably consider improving these |
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They only had to do with other parts of the app. There were no analyzer
warnings about that block of code.
…On Dec 19, 2017 7:15 PM, "Ian Hickson" ***@***.***> wrote:
Where there any analyzer warnings?
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Thanks for the update. We'll improve the error message, though this won't happy in the near future. |
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We should document CupertinoSwitch.value that it can't be null and assert != null in the constructor. |
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LongCatIsLooong
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Mar 27, 2019
Documented CupertinoSwitch.value that it can't be null and added an assertion value != null in the constructor. Related issue: #12948
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Steps to Reproduce
I was just learning how to use the CupertinoSwitch widget and didn't really know anything. I briefly looked at the docs for it a week before attempting to use it in my app.
I just did
because I didn't really know what I was doing. I had previously put in false on the value parameter because I wanted it to start out being false/off and it worked fine. At that point, I also didn't have a good callback, so my Switch wasn't responding to user input. That's when I started experimenting more and put null in for the value.
After the fact, I see that the doc gives a fairly good example, so I recognize that there was more that I could've done to understand how to use it (And I understand it now), but the flutter compiler told me that the error that it gave me wasn't clear and that I should file an issue for this reason.
I've included the Flutter Run results and Flutter Doctor results and I think that is sufficient to file the issue. Nothing in the Flutter Analysis was relavent to this discussion.
Logs
Flutter Doctor
Paste the output of running
flutter doctorhere.[✓] Flutter (on Mac OS X 10.12.6 16G29, locale en-US, channel alpha)
• Flutter at /Users/jonathansteele/flutter
• Framework revision e8aa40e (3 weeks ago), 2017-10-17 15:42:40 -0700
• Engine revision 7c41428
• Tools Dart version 1.25.0-dev.11.0
[✓] Android toolchain - develop for Android devices (Android SDK 25.0.3)
• Android SDK at /Users/jonathansteele/Library/Android/sdk
• Platform android-25, build-tools 25.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)
[✓] iOS toolchain - develop for iOS devices (Xcode 9.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 9.1, Build version 9B55
• ios-deploy 1.9.2
• CocoaPods version 1.3.1
[✓] Android Studio (version 2.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)
[✓] IntelliJ IDEA Ultimate Edition (version 2017.1.2)
• Flutter plugin version 17.0
• Dart plugin version 171.4424
[✓] Connected devices
• XT1094 • TA99120J8Y • android-arm • Android 5.1 (API 22)
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