flutter可以滚动控件之 SingleChildScrollView 防止小的窗口越界

最新推荐文章于 2025-09-11 09:10:05 发布

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这篇博客展示了如何在Flutter中使用SingleChildScrollView组件，确保内容在小窗口内不会越界。示例代码创建了一个Column，包含一个固定高度的黄色Container和一个可伸缩的红色Container，SingleChildScrollView确保了它们在不同大小的视口下都能正确显示。

SingleChildScrollView 可以防止小的窗口越界

/// Flutter code sample for SingleChildScrollView

// In this example, the column becomes either as big as viewport, or as big as
// the contents, whichever is biggest.

import 'package:flutter/material.dart';

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

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatelessWidget(),
    );
  }
}

/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return DefaultTextStyle(
      style: Theme.of(context).textTheme.bodyText2!,
      child: LayoutBuilder(
        builder: (BuildContext context, BoxConstraints viewportConstraints) {
          return SingleChildScrollView(
            child: ConstrainedBox(
              constraints: BoxConstraints(
                minHeight: viewportConstraints.maxHeight,
              ),
              child: IntrinsicHeight(
                child: Column(
                  children: <Widget>[
                    Container(
                      // A fixed-height child.
                      color: const Color(0xffeeee00), // Yellow
                      height: 120.0,
                      alignment: Alignment.center,
                      child: const Text('Fixed Height Content'),
                    ),
                    Expanded(
                      // A flexible child that will grow to fit the viewport but
                      // still be at least as big as necessary to fit its contents.
                      child: Container(
                        color: const Color(0xffee0000), // Red
                        height: 120.0,
                        alignment: Alignment.center,
                        child: const Text('Flexible Content'),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}