Flutter笔记-There are multiple heroes that share the same tag within a subtree

在使用FloatingActionButton时报错了

floatingActionButton: Row(mainAxisAlignment: MainAxisAlignment.center,crossAxisAlignment: CrossAxisAlignment.center,children: <Widget>[FloatingActionButton(onPressed: () => _addItem(),child: Icon(Icons.add),),SizedBox(width: 60,),FloatingActionButton(onPressed: () => _removeItem(),child: Icon(Icons.remove),),],),

报错内容：

════════ Exception caught by scheduler library ═════════════════════════════════
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 (i.e. a PageRoute subtree), each Hero must have a unique non-null tag.
In this case, multiple heroes had the following tag: <default FloatingActionButton tag>
Here is the subtree for one of the offending heroes: Herotag: <default FloatingActionButton tag>state: _HeroState#2520e

主要问题是在使用多个FloatingActionButton时heroTag需是唯一的。

解决方案：

floatingActionButton: Row(mainAxisAlignment: MainAxisAlignment.center,crossAxisAlignment: CrossAxisAlignment.center,children: <Widget>[FloatingActionButton(heroTag: 'first',onPressed: () => _addItem(),child: Icon(Icons.add),),SizedBox(width: 60,),FloatingActionButton(heroTag: 'second',onPressed: () => _removeItem(),child: Icon(Icons.remove),),

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