flutter 禁止横屏设置

1.Flutter 设置

在 main 函数加载app前添加以下代码

SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown,
  ])

添加后的结果

void main() async {
  WidgetsBinding widgetsBinding = WidgetsFlutterBinding.ensureInitialized();
   
    // 在此处添加代码
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown,
  ]);

  runApp(App());
}

*上面的代码可以应对很多情况，但是在ipad 中可能会失效。android pad 没问题。为了避免出现问题可以在adnroid、ios 系统层面设置

Android - app-> main- > src -> AndroidManifest.xml

在activity 标签中增加

android:screenOrientation="portrait"

添加后的样子

<activity
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:screenOrientation="portrait"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"

            android:windowSoftInputMode="adjustResize">
.......

Ios - Runner -> Info.plist

Iphone：在 <key>UISupportedInterfaceOrientations</key> 标签中增加

<array>
			<!-- <string>UIInterfaceOrientationPortrait</string>
			<string>UIInterfaceOrientationLandscapeLeft</string>
			<string>UIInterfaceOrientationLandscapeRight</string> -->
			<string>UIInterfaceOrientationPortraitUpsideDown</string>
		</array>

如果已经存在你要注释掉左右标签。

Ipad <key>UISupportedInterfaceOrientations~ipad</key> 此标签是设置ipad 屏幕转向的

<array>
			<!-- <string>UIInterfaceOrientationPortrait</string> -->
			<string>UIInterfaceOrientationPortraitUpsideDown</string>
			<!-- <string>UIInterfaceOrientationLandscapeLeft</string>
			<string>UIInterfaceOrientationLandscapeRight</string> -->
		</array>

以上标签，没有的添加上已经存在的进行修改即可。

最终样子：

<key>UISupportedInterfaceOrientations</key>
		<array>
			<!-- <string>UIInterfaceOrientationPortrait</string>
			<string>UIInterfaceOrientationLandscapeLeft</string>
			<string>UIInterfaceOrientationLandscapeRight</string> -->
			<string>UIInterfaceOrientationPortraitUpsideDown</string>
		</array>
		<key>UISupportedInterfaceOrientations~ipad</key>
		<array>
			<!-- <string>UIInterfaceOrientationPortrait</string> -->
			<string>UIInterfaceOrientationPortraitUpsideDown</string>
			<!-- <string>UIInterfaceOrientationLandscapeLeft</string>
			<string>UIInterfaceOrientationLandscapeRight</string> -->
		</array>