[Представления платформы Flutter]Кадр с камеры не отображается в iOS с DataScannerViewController ⇐ IOS

[Гость]

Я использую Flutter Platform View для встраивания собственного представления iOS во Flutter. Собственное представление iOS связано с DataScannerViewController, который входит в состав Vision Kit. Но при запуске приложения Flutter вид становится белым.
Но я запускал тот же код в родной iOS. Все работало нормально. Моя работа с кодом следующая. можно ли как-нибудь решить эту проблему?
//Flutter Code@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: const UiKitView(viewType: 'ARViewContainer'));
}

//Code in Swift

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
\_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: \[UIApplication.LaunchOptionsKey: Any\]?
) -\> Bool {
GeneratedPluginRegistrant.register(with: self)
weak var registrar = self.registrar(forPlugin: "my-views")
let cealQrViewfactory = ARViewContainerNativeViewFactory(messenger: registrar!.messenger())
let viewRegistrar = self.registrar(forPlugin: "\")!
viewRegistrar.register (cealQrViewfactory,
withId: "ARViewContainer")
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}

import UIKit
import VisionKit
import AVKit

class ARViewContainerNativeViewFactory: NSObject, FlutterPlatformViewFactory {
private var messenger: FlutterBinaryMessenger

init (messenger: FlutterBinaryMessenger){
self.messenger = messenger
super.init ()
}

public func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
return FlutterStandardMessageCodec.sharedInstance()
}

func create( withFrame frame: CGRect, viewIdentifier viewId: Int64,
arguments args: Any?) -> FlutterPlatformView{
return ARViewContainerNativeView(frame: frame, viewIdentifier: viewId, arguments: args, binaryMessenger: messenger)
}

}

class ARViewContainerNativeView: NSObject, FlutterPlatformView {
private var \_view: UIView
let channel: FlutterMethodChannel

init( frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?,
binaryMessenger messenger: FlutterBinaryMessenger?
) {
let argumentsDictionary = (args as? Dictionary) ?? [:]
_view = UIView()
channel = FlutterMethodChannel(name: "ARContainerView/\(viewId)", binaryMessenger: messenger!)

super.init ()
createNativeView(view: _view, productList: argumentsDictionary)
}

func view() -> UIView {
return _view
}

func createNativeView(view _view: UIView, productList :Dictionary) {
let vc = UIStoryboard(name: "MatrixBarcodeStory", bundle: nil).instantiateViewController(withIdentifier: "MatrixBarcodeVC") as! MatrixBarcodeVC
vc.view.frame = _view.bounds
_view.addSubview(vc.view)
}

public func sendFromNative(_ text: String) {
channel.invokeMethod("sendFromNative", arguments: text)
}

}

class MatrixBarcodeVC: UIViewController, DataScannerViewControllerDelegate {

let dataScannerVC = DataScannerViewController(
recognizedDataTypes: [.barcode()],
qualityLevel: .balanced,
recognizesMultipleItems: true,
isGuidanceEnabled: true,
isHighlightingEnabled: false
)

private var isScannerAvailable: Bool {
DataScannerViewController.isAvailable && DataScannerViewController.isSupported
}

var itemHighlightViews: [RecognizedItem.ID: UIView] = [:]

override func viewDidLoad() {
super.viewDidLoad()
dataScannerVC.delegate = self
dataScannerVC.view.frame = self.view.bounds
self.view.addSubview(dataScannerVC.view)
try? self.dataScannerVC.startScanning()
}

}

//DataScannerViewControllerDelegate
extension MatrixBarcodeVC{

func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) {
for item in addedItems {
switch item {
case .barcode(_):
let newView = newHighlightView(item: item)
itemHighlightViews[item.id] = newView
dataScanner.overlayContainerView.addSubview(newView)
print("item \(item)")
default:
break
}
}
}

func dataScanner(_ dataScanner: DataScannerViewController, didUpdate updatedItems: [RecognizedItem], allItems: [RecognizedItem]) {
for item in updatedItems {
if let view = itemHighlightViews[item.id] {
updateHighlightView(item: item, view: view)
}
}
}

func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) {
for item in removedItems {
if let view = itemHighlightViews[item.id] {
itemHighlightViews.removeValue(forKey: item.id)
view.removeFromSuperview()
print("didRemovedItems \(removedItems)")
}
}
}

func updateHighlightView(item:RecognizedItem, view:UIView){
var rect = CGRect(origin: item.bounds.bottomLeft,
size: CGSize(width: item.bounds.topRight.x - item.bounds.topLeft.x,
height: item.bounds.topRight.y - item.bounds.bottomRight.y))
view.frame = rect
}

func dataScanner(_ dataScanner: DataScannerViewController, didTapOn item: RecognizedItem) {
print("didTapOn \(item)")
}

func dataScanner(_ dataScanner: DataScannerViewController, becameUnavailableWithError error: DataScannerViewController.ScanningUnavailable){
print("became unavailable with error \(error.localizedDescription)")
}

}

//MARK: Helping Methods
extension MatrixBarcodeVC{

func newHighlightView(item:RecognizedItem) -> UIView{
print("height :: \(item.bounds.topRight.y - item.bounds.bottomRight.y)")
switch item {
case .barcode(let barcode):
print(barcode.payloadStringValue)
default:
break
}
return UIView()
}
}


Источник: https://stackoverflow.com/questions/773 ... iewcontrol