行中相同的 Flutter Widgets 抛出错误？

Question

我在一行中生成了 2 个 FloatingActionButton。路由到其文件时出现以下错误...

The following assertion was thrown during a scheduler callback: There are multiple heroes that share the same tag within a subtree. Within each subtree for which heroes are to be animated (typically a PageRoute subtree), each Hero must have a unique non-null tag. In this case, multiple heroes had the tag "Instance of 'Object'".

这是我的代码...

new Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                new FloatingActionButton(
                    child: new Icon(Icons.remove), onPressed: _decline),
                new Padding(padding: new EdgeInsets.all(10.0)),
                new Text(
                  _count.toString(),
                  style: new TextStyle(
                      fontSize: 40.0,
                      fontWeight: FontWeight.bold,
                      color: Colors.black),
                ),
                new Padding(padding: new EdgeInsets.all(10.0)),
                new FloatingActionButton(
                    child: new Icon(Icons.add), onPressed: _increment),
              ],
            )

这就是我路由到我的文件的方式...

Navigator.push(context, new MaterialPageRoute(builder: (_) => new Video.VideoPage()));

当我注释掉第一个 FloatingActionButton 时，它工作正常。只有当它们都被使用时才会出错。如果重要的话，我的 Row 也是 Column 小部件的子项。

Answer 1

尝试为每个 FloatingActionButton 添加一个唯一的 heroTag，这样 Flutter 就不会将两个按钮相互混淆，例如：

new Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          new FloatingActionButton(
              heroTag: "Decline",
              child: new Icon(Icons.remove), onPressed: _decline),
          new Padding(padding: new EdgeInsets.all(10.0)),
          new Text(
            _count.toString(),
            style: new TextStyle(
                fontSize: 40.0,
                fontWeight: FontWeight.bold,
                color: Colors.black),
          ),
          new Padding(padding: new EdgeInsets.all(10.0)),
          new FloatingActionButton(
              heroTag: "Increment",
              child: new Icon(Icons.add), onPressed: _increment),
        ],
      ),

Answer 2

我们不能在同一页面上使用多个浮动操作按钮，因此有两种可能性。

不要使用多个浮动操作按钮（Flutter 很棒所以还有其他方法可以得到相同的结果）
不要让 heroTag 为空。

行中相同的 Flutter Widgets 抛出错误？

Identical Flutter Widgets in Row throwing error?

routes

row

widget

flutter