Flutter 'owner!._debugCurrentBuildTarget == this'：不是真的。#87

Question

当我尝试从url加载pdf时，我得到了这个错误。它显示了pdf的页数，但随后就崩溃了。

使用插件- https://pub.dev/packages/advance_pdf_viewer

════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (28488): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (28488): The following assertion was thrown while rebuilding dirty elements:
I/flutter (28488): 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4371 pos 14:
I/flutter (28488): 'owner!._debugCurrentBuildTarget == this': is not true.
I/flutter (28488):
I/flutter (28488): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (28488): more information in this error message to help you determine and fix the underlying cause.
I/flutter (28488): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (28488):   https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (28488):
I/flutter (28488): The relevant error-causing widget was:
I/flutter (28488):   PDFViewer
I/flutter (28488):   
lib/…/panSignatureScreens/pan_screen.dart:156
I/flutter (28488):
I/flutter (28488): When the exception was thrown, this was the stack:
I/flutter (28488): #2      Element.rebuild.<anonymous closure> 
package:flutter/…/widgets/framework.dart:4371
I/flutter (28488): #3      Element.rebuild 
package:flutter/…/widgets/framework.dart:4374
I/flutter (28488): #4      BuildOwner.buildScope 
package:flutter/…/widgets/framework.dart:2777
I/flutter (28488): #5      WidgetsBinding.drawFrame 
package:flutter/…/widgets/binding.dart:906
I/flutter (28488): #6      RendererBinding._handlePersistentFrameCallback 
package:flutter/…/rendering/binding.dart:309
I/flutter (28488): #7      SchedulerBinding._invokeFrameCallback 
package:flutter/…/scheduler/binding.dart:1117
I/flutter (28488): #8      SchedulerBinding.handleDrawFrame 
package:flutter/…/scheduler/binding.dart:1055
I/flutter (28488): #9      SchedulerBinding._handleDrawFrame 
package:flutter/…/scheduler/binding.dart:971
I/flutter (28488): #13     _invoke  (dart:ui/hooks.dart:251:10))
I/flutter (28488): #14     _drawFrame  (dart:ui/hooks.dart:209:3))

我的用法-在列中(子项：[])

new Expanded(
                  child: Container(
                    child: PDFViewer(
                      document: document,
                    ),
                    decoration: BoxDecoration(
                      border: Border.all(color: Colors.black),
                    ),
                  ),
                ),

Answer 1

我也有同样的问题，问题是我在同一个类中调用了这个类。查看正文:如下所示。用另一个小部件替换它解决了这个问题。

class DicePage extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
                   home: Scaffold(
                   backgroundColor: Colors.red,
                   appBar: AppBar(
                             title: Text('Dicee'),
                             backgroundColor: Colors.red,
                           ),
                    body: DicePage(),
      ),
    );
  }
}

Answer 2

我刚刚犯了一个类似的错误：

════════ Exception caught by widgets library ═══════════════════════════════════
The following StackOverflowError was thrown building Container:
Stack Overflow

The relevant error-causing widget was
Container
lib/widgets/profile_wiget.dart:9
When the exception was thrown, this was the stack
#0      new _HashMap (dart:collection-patch/collection_patch.dart)
#1      new HashMap (dart:collection-patch/collection_patch.dart:33:22)
#2      RegExp._cache (dart:core-patch/regexp_patch.dart:109:11)
#3      RegExp._cache (dart:core-patch/regexp_patch.dart)
#4      new RegExp (dart:core-patch/regexp_patch.dart:17:31)
...
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by widgets library ═══════════════════════════════════
'package:flutter/src/widgets/framework.dart': Failed assertion: line 4371 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.
The relevant error-causing widget was
ProfileWidget
lib/widgets/profile_wiget.dart:10
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by widgets library ═══════════════════════════════════
'package:flutter/src/widgets/framework.dart': Failed assertion: line 4371 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.
The relevant error-causing widget was
Container
lib/widgets/profile_wiget.dart:9
════════════════════════════════════════════════════════════════════════════════

这可能是另一个原因，因为我得到了一个堆栈溢出，但我的答案希望能帮助其他人谁搜索这个错误消息。

我的问题是，我创建了一个返回自身实例的小部件(我将两个类命名为相同)：

class ProfileWidget extends StatelessWidget {
  final Profile profile = Profile(name: 'Someone');
  @override
  Widget build(BuildContext context) {
    return Container(
      child: (profile.isAnon) ? AnonProfileWidget() : ProfileWidget(), 
    );
  }
}

我通过简单地重命名一个类解决了这个问题。

Answer 3

你在使用FirebaseMessaging吗？如果是这样的话，这可能是advance_pdf_viewer和FirebaseMessaging的onBackgroundMessage之间的冲突。