Question

如何增加带有图标的凸起按钮的高度？因为使用RaisedButton.icon后填充无法正常工作。

Answer 1

您可以用Padding包裹图标，如下所示：

RaisedButton.icon(
  icon: Padding(
    padding: EdgeInsets.only(left: 50, top: 20, right: 50, bottom: 15),
    child: Icon(Icons.ac_unit),
  ),
  ...
)

Answer 2

使用SizeBox正常工作

Padding(
              padding: const EdgeInsets.all(8.0),
              child: SizedBox(
                  height: 100,
                  width: 300, // specific value
                  child: RaisedButton.icon(
                      shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(40.0)),
                      onPressed: () {},
                      icon: Icon(Icons.ac_unit),
                      label: Text("abc"))),
            ),

完整代码

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: SizedBox(
                  height: 100,
                  width: 300, // specific value
                  child: RaisedButton.icon(
                      shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(40.0)),
                      onPressed: () {},
                      icon: Icon(Icons.ac_unit),
                      label: Text("abc"))),
            ),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Answer 3

const ElevatedButton({ 钥匙？钥匙，需要 VoidCallback？按下，空回调？在长按，按钮样式？风格，焦点节点？焦点节点，布尔自动对焦=假，剪辑剪辑行为 = Clip.none，需要的小部件？孩子， }）：极好的（钥匙：钥匙， onPressed: onPressed, onLongPress: onLongPress, 风格：风格，焦点节点：焦点节点，自动对焦：自动对焦，剪辑行为：剪辑行为，孩子：孩子， );

如何增加带有图标的凸起按钮的大小？

3 个答案: