Flutter:我可以将参数传递给按钮上的onPress事件中定义的函数吗?
我有一个简单的带有按钮的表格来计算表格。我认为最好是按一下按钮以开始计算并将变量传递给哑函数,而不是让函数知道它不需要知道的文本字段。我可以这样做还是我的计算功能需要访问我的TextField?
new Container( color: Colors.grey.shade300,
padding: new EdgeInsets.all(15.0),
child: new Column(
children: <Widget>[
new TextField(
controller: _ageController,
decoration: new InputDecoration(
icon: new Icon(Icons.person_outline), labelText: "Age"),
),
new TextField(
controller: _heightController,
decoration: new InputDecoration(
icon: new Icon(Icons.insert_chart),
labelText: "Height (in feet)"),
),
new TextField(
controller: _weightController,
decoration: new InputDecoration(
icon: new Icon(Icons.line_weight),
labelText: "Weight (in lbs)"),
),
new Padding(padding: new EdgeInsets.only(top: 20.0)),
new RaisedButton(
onPressed: calculate(1, 2),
color: Colors.pinkAccent,
child: new Text(
"Calculate",
style: new TextStyle(color: Colors.white),
),
)
],
),
),
],
),
);
}
void calculate(num1, num2) {
}
}
回答:
例如
int result = 0; void calculate(num1, num2) {
setState(() {
result = num1 + num2;
});
}
new RaisedButton(
onPressed: () => calculate(1, 100),
...
),
new Text("$result")
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