dart - 需要帮助解决 Flutter pixels assertion error

Question

我不断从流生成器 if 语句中收到此断言错误像素!=null，它不会从 if 返回任何内容，只会从 else 返回。谢谢你。很困惑

  Widget build(BuildContext context) {
    print("ffff23223r");
    return new StreamBuilder(
        stream: FirebaseAuth.instance.currentUser().asStream(),
        builder: (context, theuser) {
                   {
            if(theuser.hasData && theuser.data.isEmailVerified){
            return  Container(color:Colors.red
            );//always gives me error
          }
          else{return intro(theuser);//works fine no matter whats here  }
          }
        });  
  }

错误:

Exception has occurred. 'package:flutter/src/widgets/scroll_position.dart': Failed assertion: line 661 pos 12: 'pixels != null': is not true.

static _doThrowNew(int assertionStart, int assertionEnd, Object message) native "AssertionError_throwNew";

Answer 1

我发现需要放在tabbar View 中:

 return new StreamBuilder(
    stream: FirebaseAuth.instance.currentUser().asStream(),
    builder: (context, theuser) {
      {
        return Scaffold(
          body: new TabBarView(controller: controller, children: <Widget>[
            theuser.hasData && theuser.data.isEmailVerified
                ? main2MapPage(theuser)
                : new intro(theuser),
          ]),
          backgroundColor: Colors.redAccent,
        );
      }
    });