📜  在Flutter对齐小部件

📅  最后修改于: 2021-09-02 05:11:24             🧑  作者: Mango

Align Widget 是用于在其自身内对齐其子级的小部件,并可选择根据子级的大小调整自身大小。 Align Widget 非常灵活,可以根据子项的大小更改其大小

Align 类的构造函数:

Syntax:
Align({Key key, 
AlignmentGeometry alignment: Alignment.center,
double widthFactor, 
double heightFactor, 
Widget child})

对齐小部件的属性:

  • 对齐:它设置对齐方式。
  • child:树中的子部件。
  • hashCode:对象的哈希码。
  • heightFactor:它将其高度设置为孩子的身高乘以这个 heightFactor。
  • key:用于控制一个小部件如何替换另一个小部件
  • runtimeType:是运行时类型的表示。
  • widthFactor:它将其宽度设置为孩子的宽度乘以这个 widthFactor。

示例 1:在容器中心对齐文本。

主要的。dart文件:

Dart
import 'package:flutter/material.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'TextSpan',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: MyHomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}
 
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
 
class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text('GeeksforGeeks Align Widget'),
            backgroundColor: Colors.green),
        body: Center(
            child: Container(
          height: 120.0,
          width: 120.0,
          color: Colors.blue[50],
          child: Align(
            alignment: Alignment.center,
            child: Text(
              "Geeky Text",
              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
            ),
          ),
        )));
  }
}


Dart
import 'package:flutter/material.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'TextSpan',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: MyHomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}
 
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
 
class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text('GeeksforGeeks Align Widget'),
            backgroundColor: Colors.green),
        body: Center(
            child: Container(
          height: 240.0,
          width: 240.0,
          color: Colors.green,
          child: Align(
              alignment: Alignment.topRight,
              child: Image.network(
                "https://www.geeksforgeeks.org/wp-content/uploads/gfg_200X200-1.png",
                width: 100,
              )),
        )));
  }
}


输出:

居中对齐

示例 2:在容器的右上角对齐图像。

主要的。dart文件:

Dart

import 'package:flutter/material.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'TextSpan',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: MyHomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}
 
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
 
class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text('GeeksforGeeks Align Widget'),
            backgroundColor: Colors.green),
        body: Center(
            child: Container(
          height: 240.0,
          width: 240.0,
          color: Colors.green,
          child: Align(
              alignment: Alignment.topRight,
              child: Image.network(
                "https://www.geeksforgeeks.org/wp-content/uploads/gfg_200X200-1.png",
                width: 100,
              )),
        )));
  }
}

输出:

左对齐

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