Flutter三方库介绍和梳理

1.path_provider
用于查找文件系统上常用位置的Flutter插件。 支持Android、iOS、Linux、macOS和Windows。 并非所有平台都支持所有方法

example：

Directory tempDir = await getTemporaryDirectory();
String tempPath = tempDir.path;

Directory appDocDir = await getApplicationDocumentsDirectory();
String appDocPath = appDocDir.path;

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2.flutter_slidable
具有可撤销的定向滑动动作的可滑动列表项的颤振实现。

example

Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Slidable Example',
      home: Scaffold(
        body: ListView(
          children: [
            Slidable(
              // Specify a key if the Slidable is dismissible.
              key: const ValueKey(0),

              // The start action pane is the one at the left or the top side.
              startActionPane: ActionPane(
                // A motion is a widget used to control how the pane animates.
                motion: const ScrollMotion(),

                // A pane can dismiss the Slidable.
                dismissible: DismissiblePane(onDismissed: () {}),

                // All actions are defined in the children parameter.
                children:  [
                  // A SlidableAction can have an icon and/or a label.
                  SlidableAction(
                    onPressed: (BuildContext context){
                      print('Delete');
                    },
                    backgroundColor: Color(0xFFFE4A49),
                    foregroundColor: Colors.white,
                    icon: Icons.delete,
                    label: 'Delete',
                  ),
                  SlidableAction(
                    onPressed: (BuildContext context){
                      print('Share');
                    },
                    backgroundColor: Color(0xFF21B7CA),
                    foregroundColor: Colors.white,
                    icon: Icons.share,
                    label: 'Share',
                  ),
                ],
              ),

              // The end action pane is the one at the right or the bottom side.
              endActionPane:  ActionPane(
                motion: ScrollMotion(),
                children: [
                  SlidableAction(
                    // An action can be bigger than the others.
                    flex: 2,
                    onPressed: (BuildContext context){
                      print('archive');
                    },
                    backgroundColor: Color(0xFF7BC043),
                    foregroundColor: Colors.white,
                    icon: Icons.archive,
                    label: 'Archive',
                  ),
                  SlidableAction(
                    onPressed: (BuildContext context){
                      print('save');
                    },
                    backgroundColor: Color(0xFF0392CF),
                    foregroundColor: Colors.white,
                    icon: Icons.save,
                    label: 'Save',
                  ),
                ],
              ),

              // The child of the Slidable is what the user sees when the
              // component is not dragged.
              child: const ListTile(title: Text('Slide me')),
            ),
          ],
        ),
      ),
    );
  }

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3.sign_in_with_apple
Flutter bridge to Sign in with Apple. Supports login via an Apple ID, as well as retrieving credentials saved in the user's keychain.

example

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Example app: Sign in with Apple'),
        ),
        body: Container(
          padding: const EdgeInsets.all(10),
          child: Center(
            child: SignInWithAppleButton(
              onPressed: () async {
                final credential = await SignInWithApple.getAppleIDCredential(
                  scopes: [
                    AppleIDAuthorizationScopes.email,
                    AppleIDAuthorizationScopes.fullName,
                  ],
                  webAuthenticationOptions: WebAuthenticationOptions(
                    // TODO: Set the `clientId` and `redirectUri` arguments to the values you entered in the Apple Developer portal during the setup
                    clientId:
                        'de.lunaone.flutter.signinwithappleexample.service',

                    redirectUri:
                        // For web your redirect URI needs to be the host of the "current page",
                        // while for Android you will be using the API server that redirects back into your app via a deep link
                        kIsWeb
                            ? Uri.parse('https://${window.location.host}/')
                            : Uri.parse(
                                'https://flutter-sign-in-with-apple-example.glitch.me/callbacks/sign_in_with_apple',
                              ),
                  ),
                  // TODO: Remove these if you have no need for them
                  nonce: 'example-nonce',
                  state: 'example-state',
                );

                // ignore: avoid_print
                print(credential);

                // This is the endpoint that will convert an authorization code obtained
                // via Sign in with Apple into a session in your system
                final signInWithAppleEndpoint = Uri(
                  scheme: 'https',
                  host: 'flutter-sign-in-with-apple-example.glitch.me',
                  path: '/sign_in_with_apple',
                  queryParameters: <String, String>{
                    'code': credential.authorizationCode,
                    if (credential.givenName != null)
                      'firstName': credential.givenName!,
                    if (credential.familyName != null)
                      'lastName': credential.familyName!,
                    'useBundleId':
                        !kIsWeb && (Platform.isIOS || Platform.isMacOS)
                            ? 'true'
                            : 'false',
                    if (credential.state != null) 'state': credential.state!,
                  },
                );

                final session = await http.Client().post(
                  signInWithAppleEndpoint,
                );

                // If we got this far, a session based on the Apple ID credential has been created in your system,
                // and you can now set this as the app's session
                // ignore: avoid_print
                print(session);
              },
            ),
          ),
        ),
      ),
    );
  }
}

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4.shared_preferences
为简单数据包装特定平台的持久存储(iOS和macOS上的NSUserDefaults, Android上的SharedPreferences，等等)。数据可以异步持久化到磁盘，并且不能保证写入在返回后会持久化到磁盘，所以这个插件不能用于存储关键数据。 支持的数据类型有int、double、bool、String和List<String>。