Flutter 无法在颤振中改变方向

一旦我使用下面的代码，我就无法将方向更改为横向模式。我把方向也调回了正常

我想做的是，我希望在android和IOS上，某个特定的活动只能是纵向的，而其他活动则是正常的（纵向和横向的）

@override
  void initState() {
    super.initState();
    SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
}

@override
  void dispose() {
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight
    ]);
}

---

试用dart pub上提供的这款颤振套装：

---

试用dart pub上提供的这款颤振套装，适用于：

您可以使用软件包

代码片段

FlatButton(
        onPressed: () {
          AutoOrientation.portraitDownMode();
        }

完整示例代码

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:auto_orientation/auto_orientation.dart';

void main() {
  runApp(
    AutoOrientationDemo(),
  );
}

class AutoOrientationDemo extends StatefulWidget {
  AutoOrientationDemo({this.title = 'Auto Orientation Demo'});

  final String title;

  @override
  State<StatefulWidget> createState() {
    return _AutoOrientationDemoState();
  }
}

class _AutoOrientationDemoState extends State<AutoOrientationDemo> {
  TargetPlatform _platform;

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: widget.title,
      theme: ThemeData.light().copyWith(
        platform: _platform ?? Theme.of(context).platform,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Column(
          children: <Widget>[
            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitDownMode();
                    },
                    child: Padding(
                      child: Text("Portrait UPSIDE Down"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.fullAutoMode();
                    },
                    child: Padding(
                      child: Text("All modes"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            ),

            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.landscapeAutoMode();
                    },
                    child: Padding(
                      child: Text("Landscape auto"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitAutoMode();
                    },
                    child: Padding(
                      child: Text("Portrait auto"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            ),

            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.landscapeLeftMode();
                    },
                    child: Padding(
                      child: Text("Landscape left mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      SystemChrome.setPreferredOrientations([
                        DeviceOrientation.portraitUp,
                        DeviceOrientation.portraitDown,
                        DeviceOrientation.landscapeLeft,
                        DeviceOrientation.landscapeRight,
                      ]);
                      AutoOrientation.landscapeRightMode();
                    },
                    child: Padding(
                      child: Text("Landscape right mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            ),
            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitUpMode();
                    },
                    child: Padding(
                      child: Text("Portrait up mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitDownMode();
                    },
                    child: Padding(
                      child: Text("Portrait down mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            )
          ],
        ),
      ),
    );
  }
}

import'包装：flift/cupertino.dart'；
进口“包装：颤振/材料.省道”；
导入“包：flifter/services.dart”；
导入“package:auto_orientation/auto_orientation.dart”；
void main（）{
runApp(
AutoOrientationDemo（），
);
}
类AutoOrientionDemo扩展StatefulWidget{
AutoOrientationDemo（{this.title='Auto-Orientation-Demo'}）；
最后的字符串标题；
@凌驾
状态createState（）{
返回_autoorientedemostate（）；
}
}
类_autoorientedmostate扩展状态
您可以使用包

代码片段

FlatButton(
        onPressed: () {
          AutoOrientation.portraitDownMode();
        }

完整示例代码

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:auto_orientation/auto_orientation.dart';

void main() {
  runApp(
    AutoOrientationDemo(),
  );
}

class AutoOrientationDemo extends StatefulWidget {
  AutoOrientationDemo({this.title = 'Auto Orientation Demo'});

  final String title;

  @override
  State<StatefulWidget> createState() {
    return _AutoOrientationDemoState();
  }
}

class _AutoOrientationDemoState extends State<AutoOrientationDemo> {
  TargetPlatform _platform;

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: widget.title,
      theme: ThemeData.light().copyWith(
        platform: _platform ?? Theme.of(context).platform,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Column(
          children: <Widget>[
            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitDownMode();
                    },
                    child: Padding(
                      child: Text("Portrait UPSIDE Down"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.fullAutoMode();
                    },
                    child: Padding(
                      child: Text("All modes"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            ),

            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.landscapeAutoMode();
                    },
                    child: Padding(
                      child: Text("Landscape auto"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitAutoMode();
                    },
                    child: Padding(
                      child: Text("Portrait auto"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            ),

            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.landscapeLeftMode();
                    },
                    child: Padding(
                      child: Text("Landscape left mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      SystemChrome.setPreferredOrientations([
                        DeviceOrientation.portraitUp,
                        DeviceOrientation.portraitDown,
                        DeviceOrientation.landscapeLeft,
                        DeviceOrientation.landscapeRight,
                      ]);
                      AutoOrientation.landscapeRightMode();
                    },
                    child: Padding(
                      child: Text("Landscape right mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            ),
            Row(
              children: <Widget>[
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitUpMode();
                    },
                    child: Padding(
                      child: Text("Portrait up mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
                Expanded(
                  child: FlatButton(
                    onPressed: () {
                      AutoOrientation.portraitDownMode();
                    },
                    child: Padding(
                      child: Text("Portrait down mode"),
                      padding: EdgeInsets.symmetric(vertical: 16.0),
                    ),
                  ),
                ),
              ],
            )
          ],
        ),
      ),
    );
  }
}

import'包装：flift/cupertino.dart'；
进口“包装：颤振/材料.省道”；
导入“包：flifter/services.dart”；
导入“package:auto_orientation/auto_orientation.dart”；
void main（）{
runApp(
AutoOrientationDemo（），
);
}
类AutoOrientionDemo扩展StatefulWidget{
AutoOrientationDemo（{this.title='Auto-Orientation-Demo'}）；
最后的字符串标题；
@凌驾
状态createState（）{
返回_autoorientedemostate（）；
}
}
类_autoorientedmostate扩展状态
尝试这样在dispose方法内部调用<代码>SystemChrome.setPreferredOrientations（[]）尝试像这样在dispose方法内部调用<代码>SystemChrome.setPreferredOrientations（[]）