emptyWidget赋值后,在onRefresh:null 时报错

[dahuahe]

因为是聊天,所以onRefresh 就不写了 但是会出现报错
flutter: ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
flutter: The following assertion was thrown during a scheduler callback:
flutter: 'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1458 pos 12: 'center.parent ==
flutter: this': is not true.
flutter:
flutter: Either the assertion indicates an error in the framework itself, or we should provide substantially
flutter: more information in this error message to help you determine and fix the underlying cause.
flutter: In either case, please report this assertion by filing a bug on GitHub:
flutter: https://github.com/flutter/flutter/issues/new?template=BUG.md
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #2 RenderViewport.indexOfFirstChild (package:flutter/src/rendering/viewport.dart:1458:12)
flutter: #3 RenderViewportBase.debugDescribeChildren (package:flutter/src/rendering/viewport.dart:772:17)
flutter: #4 DiagnosticableTreeNode.getChildren (package:flutter/src/foundation/diagnostics.dart:2843:20)
flutter: #5 TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1168:43)
flutter: #6 TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1295:39)
flutter: #7 FlutterError.dumpErrorToConsole (package:flutter/src/foundation/assertions.dart:623:11)
flutter: #8 FlutterError.reportError (package:flutter/src/foundation/assertions.dart:712:14)
flutter: #9 RenderObject._debugReportException (package:flutter/src/rendering/object.dart:1185:18)
flutter: #10 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1499:7)
flutter: #11 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:765:18)
flutter: #12 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:346:19)
flutter: #13 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:701:13)
flutter: #14 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
flutter: #15 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
flutter: #16 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
flutter: #17 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:874:5)
flutter: #21 _invoke (dart:ui/hooks.dart:236:10)
flutter: #22 _drawFrame (dart:ui/hooks.dart:194:3)
flutter: (elided 5 frames from class _AssertionError and package dart:async)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════
flutter: Another exception was thrown: 'package:flutter/src/rendering/box.dart': Failed assertion: line 1694 pos 18: 'debugDoingThisResize || debugDoingThisLayout ||
flutter: Another exception was thrown: 'package:flutter/src/rendering/box.dart': Failed assertion: line 1694 pos 18: 'debugDoingThisResize || debugDoingThisLayout ||
flutter: Another exception was thrown: 'package:flutter/src/rendering/box.dart': Failed assertion: line 1694 pos 18: 'debugDoingThisResize || debugDoingThisLayout ||
flutter: Another exception was thrown: Updated layout information required for RenderViewport#3abbb NEEDS-LAYOUT NEEDS-PAINT to calculate semantics.
flutter: Another exception was thrown: 'package:flutter/src/rendering/box.dart': Failed assertion: line 1694 pos 18: 'debugDoingThisResize || debugDoingThisLayout ||
flutter: Another exception was thrown: 'package:flutter/src/rendering/object.dart': Failed assertion: line 1796 pos 12: '!_needsPaint': is not true.

[dahuahe]

或者聊天的时候空视图 下拉刷新为什么没有起作用呢

[xuelongqy]

下个版本将会修复。你也可以使用git的方式导入github最新的源码进行测试

[xuelongqy]

v2.0.3已修复