flutter - 命名参数未定义

Question

我目前正在学习Flutter，并且对它很陌生。我正在尝试在默认代码的增量计数器旁边创建一个减量计数器。我写了另一个减少的空位，并写了相同的代码来增加(除了增加)，但它给出了错误:

The named parameter 'bulutunKatiliRota' isn't defined. Try correcting the name to an existing named parameter, or defining a new parameter with this name.dart(undefined_named_parameter)

代码(我只写我添加的代码):

void _decreaseCounter(){
    setState(() {
      _counter--;
    });
  }

bulutunKatiliRota: FloatingActionButton(
        onPressed: _decreaseCounter,
        tooltip: 'Decrease',
        child: Icon(Icons.delete)
      )

Answer 1

将此替换为floatingActionButton:

floatingActionButton: Row(
  mainAxisAlignment: MainAxisAlignment.spaceBetween,
  children: <Widget>[
    FloatingActionButton( // first FAB to perform decrement 
      onPressed: _decrementCounter,
      child: Icon(Icons.delete),
    ),
    FloatingActionButton( // second FAB to perform increment
      onPressed: _incrementCounter,
      child: Icon(Icons.add),
    ),
  ],
)