Pyozer
Bug: Problem with skip function before initializing all pages
I faced an issue when taping skip button and let the app navigate to another page it will throw an exception with the following details:
AssertionError ('package:flutter/src/widgets/page_view.dart': Failed assertion: line 170 pos 7: 'positions.isNotEmpty': PageController.page cannot be accessed before a PageView is built with it.)
this issue is reproduceable and I shared an example bellow, another point is when I click next and go through all pages then click done, the exception will not occur.
-first page example:
`import 'package:flutter/material.dart'; import 'package:get/get.dart'; import 'package:introduction_screen/introduction_screen.dart'; import 'package:testgetx/pagetwo.dart';
import 'controller.dart';
class PageOne extends StatelessWidget { PageOne({super.key}); final introKey = GlobalKey<IntroductionScreenState>(); void _onIntroEnd(context) { Navigator.of(context) .pushReplacement(MaterialPageRoute(builder: (context) => PageTwo())); }
@override Widget build(BuildContext context) { var bodyStyle = TextStyle(fontSize: 12); var pageDecoration = PageDecoration( titleTextStyle: TextStyle( fontSize: 14, fontWeight: FontWeight.w700, ), bodyTextStyle: bodyStyle, bodyPadding: EdgeInsets.all(0), pageColor: Colors.white, imagePadding: EdgeInsets.all(0), fullScreen: true, contentMargin: EdgeInsets.all(0));
return IntroductionScreen(
key: introKey,
globalBackgroundColor: Colors.white,
allowImplicitScrolling: true,
autoScrollDuration: 3000,
infiniteAutoScroll: false,
// globalHeader: Align(),
// globalFooter: SizedBox(),
pages: [
introPageView("", pageDecoration, "title1", "body1", context),
introPageView("", pageDecoration, "title2", "body2", context),
introPageView("", pageDecoration, "title3", "body3", context)
],
onDone: () => _onIntroEnd(context),
onSkip: () =>
_onIntroEnd(context), // You can override onSkip callback
showSkipButton: true,
skipOrBackFlex: 0,
nextFlex: 0,
showBackButton: false,
//rtl: true, // Display as right-to-left
back: const Icon(Icons.arrow_back),
skip: Text("Skip".tr,
style: TextStyle(
fontWeight: FontWeight.w600,
color: Colors.blueAccent,
)),
next: const Icon(Icons.arrow_forward, color: Colors.blueAccent),
done: Text("Done".tr,
style: TextStyle(
fontWeight: FontWeight.w600,
color: Colors.blueAccent,
height: 1)),
curve: Curves.fastLinearToSlowEaseIn,
controlsMargin: const EdgeInsets.all(0),
controlsPadding: EdgeInsets.all(0),
dotsDecorator: const DotsDecorator(
size: Size(10.0, 10.0),
color: Colors.blueAccent,
activeSize: Size(22.0, 10.0),
activeColor: Colors.blueAccent,
activeShape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(25.0)),
),
),
dotsContainerDecorator: ShapeDecoration(
color: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(8.0)),
),
),
);
}
PageViewModel introPageView( imageName, PageDecoration pageDecoration, title, body, context) { return PageViewModel( title: title, body: body, image: null, decoration: pageDecoration, ); }
Widget _buildImage(String assetName, context, [double width = 350]) { return Container( padding: EdgeInsets.only(bottom: 20, left: 0, right: 0, top: 0), child: Image.asset( 'assets/images/$assetName', //height: MediaQuery.of(context).size.height / 1.2, ), ); } } `
and this is just pagetwo
`import 'package:flutter/material.dart';
class PageTwo extends StatelessWidget { const PageTwo({super.key});
@override Widget build(BuildContext context) { return Container( color: Colors.white, child: Column( children: [ Center( child: Text("pagetwo"), ), ], )); } } `
