1
MethodChannel _channel = const MethodChannel('mine_header/channel');

1
_channel.invokeMapMethod('sel_avatar');

1
import UIKit
2
import Flutter
3

4
/// 这里将指令用 枚举包装，便于使用
5
enum MineChannelMethod: String {
6
    case AvatarPick = "sel_avatar"
7
}
8

9
@UIApplicationMain
10
@objc class AppDelegate: FlutterAppDelegate {
11
    override func application(
12
        _ application: UIApplication,
13
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
14
    ) -> Bool {
15
        GeneratedPluginRegistrant.register(with: self)
16

17
        if let flutterVC = window?.rootViewController as? FlutterViewController,
18
        let messenger = flutterVC as? FlutterBinaryMessenger
19
        {
20
            // 实例化 channel
21
            let mineChannel = FlutterMethodChannel.init(name: "mine_header/channel", binaryMessenger: messenger)
22
            mineChannel.setMethodCallHandler { call, result in
23
                guard
24
                    call.method.isEmpty == false,
25
                    let method = MineChannelMethod(rawValue: call.method)
26
                else {
27
                    return
28
                }
29

30
                switch method {
31
                case .AvatarPick:
32
                    let picker = UIImagePickerController()
33
                    picker.modalPresentationStyle = .overFullScreen
34
                    picker.delegate = self
35
                    flutterVC.present(picker, animated: true, completion: nil)
36
                }
37

38
            }
39
        }
40

41
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
42
    }
43
}
44

45
extension AppDelegate: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
46
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
47
        picker.dismiss(animated: true, completion: nil)
48
    }
49

50
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
51
        picker.dismiss(animated: true, completion: nil)
52
    }
53
}

1
[__C.UIImagePickerControllerInfoKey(_rawValue: UIImagePickerControllerMediaType): public.image, __C.UIImagePickerControllerInfoKey(_rawValue: UIImagePickerControllerImageURL): file:///private/var/mobile/Containers/Data/Application/8A9A613F-32F9-4E45-8CB3-BB882CC9F590/tmp/3BC0596E-8B97-4E64-B260-269668F9CA73.png, __C.UIImagePickerControllerInfoKey(_rawValue: UIImagePickerControllerOriginalImage): <UIImage:0x281538f30 anonymous {1125, 2436} renderingMode=automatic>, __C.UIImagePickerControllerInfoKey(_rawValue: UIImagePickerControllerReferenceURL): assets-library://asset/asset.PNG?id=65B7A1B5-597F-4B97-B8E3-9CA019A9A526&ext=PNG]

1
if let imgPath = info[UIImagePickerController.InfoKey.imageURL] as? URL {
2
    print(imgPath.absoluteString)
3
}

1
if let imgPath = (info[UIImagePickerController.InfoKey.imageURL] as? URL)?.absoluteString, imgPath.count > 8 {
2
    let path = String(imgPath.suffix(from: String.Index.init(utf16Offset: 7, in: imgPath)))
3
    print(path)
4
}

1
if let imgPath = (info[UIImagePickerController.InfoKey.imageURL] as? URL)?.absoluteString, imgPath.count > 8 {
2
    let path = String(imgPath.suffix(from: String.Index.init(utf16Offset: 7, in: imgPath)))
3
    channel?.invokeMethod("rec_imagePath", arguments: path)
4
}

1
final String _selAvatar = 'sel_avatar';
2
final String _reciveImagePath = 'rec_imagePath';
3
final MethodChannel _channel = const MethodChannel('mine_header/channel');
4

5
@override
6
void initState() {
7
    super.initState();
8
    _channel.setMethodCallHandler( (call) async {
9
      if (call.method == _reciveImagePath) {
10
        print('${call.arguments}');
11
        setState(() {
12
          _avatarPath = call.arguments.toString();
13
        });
14
      }
15
    });
16
}

1
class MeHeaderView extends StatelessWidget {
2
  Function()? avatarTap;
3
  File? avatarFile;
4

5
  MeHeaderView({this.avatarTap, this.avatarFile});
6

7
  @override
8
  Widget build(BuildContext context) {
9
    return Container(
10
            ...
11
                decoration: BoxDecoration(
12
                    image: DecorationImage(
13
                    fit: BoxFit.fitWidth,
14
                    image: (avatarFile == null
15
                        ? const AssetImage('images/header_avatar.GIF')
16
                        : FileImage(avatarFile!)) as ImageProvider,
17
                    ),
18
                ),
19
            ),
20
            ...
21
  }
22
}