getx why wasn't onclose method executed in getxcontroller ?

why wasn't onclose method executed in getxcontroller ?

Open boziyoung opened this issue 1 year ago • 0 comments

i want to comply “Scroll controller” in getx, but when i Get.toNamed to B from A，To A from B again. i find that "scontroller.dispose()" wasn't executed in onClose() method;

Terminal showed error message : "Another exception was thrown: Assertion failed: file:///E:/Program%20Files/flutter/flutter_windows_2.8.1-stable/flutter/packages/flutter/lib/src/widgets/scroll_controller.dart:108:12 Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition.

Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition.

Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition. Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition. Another exception was thrown: Assertion failed: file:///E:/Program%20Files/flutter/flutter_windows_2.8.1-stable/flutter/packages/flutter/lib/src/widgets/scroll_controller.dart:108:12 Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition.

Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition.

Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition. Another exception was thrown: Assertion failed: file:///E:/Program%20Files/flutter/flutter_windows_2.8.1-stable/flutter/packages/flutter/lib/src/widgets/scroll_controller.dart:108:12 Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition. Another exception was thrown: Assertion failed: file:///E:/Program%20Files/flutter/flutter_windows_2.8.1-stable/flutter/packages/flutter/lib/src/widgets/scroll_controller.dart:108:12 Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition. Another exception was thrown: The provided ScrollController is currently attached to more than one ScrollPosition."

code ： page A ： `

final GetArticlesController a = Get.put(GetArticlesController());

@override Widget build(context) { return WillPopScope( onWillPop: () async { Get.delete<GetArticlesController>(); return true; }, child: Scaffold( appBar: MainAppbar(context), // 通过判断枚举值来进行选择对应的页面变化以确定数据加载的结果 body: GetBuilder<GetArticlesController>( builder: ((controller) {

              return SingleChildScrollView(
                // 给列表添加屏幕监听控件
                controller: controller.scontroller,
                physics: const ScrollPhysics(),
                child: Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      TextButton(
                                      onPressed: () {
                                        Get.toNamed(
                                            "/article/${controller.articleList[index]["id"]}");
                                      },
                                      child: Text(
                                        controller.articleList[index]
                                            ["title"],
                                        textAlign: TextAlign.center,
                                        style: const TextStyle(
                                            color: Colors.black,
                                            fontSize: 32,
                                            fontWeight: FontWeight.w500),
                                      ),
                                    ),
                                  ),
                     
              );`

controller A： ` class GetArticlesController extends GetxController { // 创建滚动监听组件 final ScrollController scontroller = ScrollController(); bool showTopBtn = false;

// 控制器的初始化方法，组件在内存分配后会被马上调用，可以在这个方法对 controller 做一些初始化工作

@override void onInit() { print("初始化");

print("start: $showTopBtn");
ScreenCt();
super.onInit();

}

@override void onReady() { print("onReady");

super.onReady();

}

@override void onClose() { // 为了避免内存泄漏，需要调用dispose scontroller.dispose(); print("onclse"); update(); super.onClose(); }

// 监听鼠标滚动组件位置函数 // ignore: non_constant_identifier_names void ScreenCt() { // 打印初始化监听地址 scontroller.addListener(() { // 监听位置需要在小于 500 并且 showTopBtn 为true 时生效 if (scontroller.offset < 500 && showTopBtn) { //tionButton 设为false 生效 (但是此处使用的是：！ Showtopbtn 取反操作) print("打印监听位置f" + scontroller.offset.toString()); showTopBtn = false; // 此时按钮应该消失 print("位置小于500: $showTopBtn"); // update(); } else if (scontroller.offset >= 500 && showTopBtn == false) { // 此时按钮应该出现 print("打印监听位置t" + scontroller.offset.toString()); showTopBtn = true; print("位置大于500: $showTopBtn"); // update(); } update(); }); } } doctor：Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source! Doctor summary (to see all details, run flutter doctor -v): [√] Flutter (Channel stable, 3.0.2, on Microsoft Windows [版本 10.0.19044.1889], locale zh-CN) [√] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1) [√] Chrome - develop for the web [X] Visual Studio - develop for Windows X Visual Studio not installed; this is necessary for Windows development. Download at https://visualstudio.microsoft.com/downloads/. Please install the "Desktop development with C++" workload, including all of its default components [!] Android Studio (not installed) [√] VS Code [√] Connected device (3 available) [√] HTTP Host Availability

! Doctor found issues in 2 categories.`

get: ^4.6.5

who can tell me that how I should do? please!

Sep 02 '22 15:09 boziyoung

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why wasn't onclose method executed in getxcontroller ?

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