uts混编时，swift与 uts 通信问题

没大佬回答吗

1、可以在swift代码里发送通知，或者使用使用代理，在uts代码中接收通知，或这实现代理方法。
2、uts代码编译成swift,这些功能都是支持的，原生怎么写，uts就怎么写，对应转换一下语法就行。
3、如果你想将扫到的内容传给vue页面，可以在uts中定义一个带callback参数的api,在callback中将结果回传。

代码如下：
ScanViewController.swift：
import UIKit
import DynamsoftCameraEnhancer
import DynamsoftCaptureVisionRouter
import DynamsoftBarcodeReader
import DynamsoftCore
import DynamsoftLicense
// UTS内置对象的引用
import DCloudUTSFoundation

class ScanViewController: UIViewController, CapturedResultReceiver, LicenseVerificationListener {

var cameraView:CameraView!  
let dce = CameraEnhancer()  
let cvr = CaptureVisionRouter()  

weak var delegate: DataFetchDelegate?   

override func viewDidLoad() {  
    super.viewDidLoad()  
    // Do any additional setup after loading the view.  
    setLicense()  
    setUpCamera()  
    setUpDCV()  
    console.log("scan view did loaded.delegate:",delegate)  
}  

override func viewWillAppear(_ animated: Bool) {  
    dce.open()  
    // Start capturing when the view will appear. If success, you will receive results in the CapturedResultReceiver.  
    cvr.startCapturing(PresetTemplate.readSingleBarcode.rawValue) { isSuccess, error in  
        if (!isSuccess) {  
            if let error = error {  
                self.showResult("Error", error.localizedDescription)  
            }  
        }  
    }  
    super.viewWillAppear(animated)  
}  

override func viewWillDisappear(_ animated: Bool) {  
    dce.close()  
    cvr.stopCapturing()  
    dce.clearBuffer()  
    super.viewWillDisappear(animated)  
}  

func setLicense() {  
    // Initialize the license.  
    // The license string here is a trial license. Note that network connection is required for this license to work.  
    // You can request an extension via the following link: https://www.dynamsoft.com/customer/license/trialLicense?product=dbr&utm_source=samples&package=ios  
    LicenseManager.initLicense("", verificationDelegate: self)  
}  

func displayLicenseMessage(message: String) {  
    let label = UILabel()  
    label.text = message  
    label.textAlignment = .center  
    label.numberOfLines = 0  
    label.textColor = .red  
    label.translatesAutoresizingMaskIntoConstraints = false  
    view.addSubview(label)  
    NSLayoutConstraint.activate([  
        label.centerXAnchor.constraint(equalTo: view.centerXAnchor),  
        label.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -20),  
        label.leadingAnchor.constraint(greaterThanOrEqualTo: view.leadingAnchor, constant: 20),  
        label.trailingAnchor.constraint(lessThanOrEqualTo: view.trailingAnchor, constant: -20)  
    ])  
}  

func setUpCamera() {  
    cameraView = .init(frame: view.bounds)  
    cameraView.autoresizingMask = [.flexibleWidth, .flexibleHeight]  
    view.insertSubview(cameraView, at: 0)  
    dce.cameraView = cameraView  
}  

func setUpDCV() {  
    // Set the camera enhancer as the input.  
    try! cvr.setInput(dce)  
    // Add CapturedResultReceiver to receive the result callback when a video frame is processed.  
    cvr.addResultReceiver(self)  
}  

// Implement the callback method to receive DecodedBarcodesResult.  
// The method returns a DecodedBarcodesResult object that contains an array of BarcodeResultItems.  
// BarcodeResultItems is the basic unit from which you can get the basic info of the barcode like the barcode text and barcode format.  
func onDecodedBarcodesReceived(_ result: DecodedBarcodesResult) {  
    console.log("onDecodedBarcodesReceived,self.delegate start:",self.delegate)  
    if let items = result.items, items.count > 0 {  
        DispatchQueue.main.async {  
            self.cvr.stopCapturing()  
            self.dce.clearBuffer()  
        }  
        var message = ""  
        for item in items {  
            // Extract the barcode format and the barcode text from the BarcodeResultItem.  
            message = String(format:"\nFormat: %@\nText: %@\n", item.formatString, item.text)  
            console.log("onDecodedBarcodesReceived,self.delegate end:",self.delegate)  
            self.delegate?.didReceiveData(item.text)  
            console.log("scaned:",item.text)  
        }  
        showResult("Results", message) {  
            // Restart the capture  
            self.cvr.startCapturing(PresetTemplate.readSingleBarcode.rawValue)  
        }  
    }  
}  

// MARK: LicenseVerificationListener  
func onLicenseVerified(_ isSuccess: Bool, error: Error?) {  
    if !isSuccess {  
        if let error = error {  
            print("\(error.localizedDescription)")  
            DispatchQueue.main.async {  
                self.displayLicenseMessage(message: "License initialization failed：" + error.localizedDescription)  
            }  
        }  
    }  
}  

private func showResult(_ title: String, _ message: String?, completion: (() -> Void)? = nil) {  
    DispatchQueue.main.async {  
        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)  
        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { _ in completion?() }))  
        self.present(alert, animated: true, completion: nil)  
    }  
}  

}
ParentViewController.uts代码

import { UTSiOS } from "DCloudUTSFoundation"

export class ParentViewController implements DataFetchDelegate {

viewDidAppear() {  
    let asyncVC = ScanViewController()  
    asyncVC.delegate = this  
    UTSiOS.getCurrentViewController().present(asyncVC, animated = true, completion = null)  
}  
@objc didReceiveData(data : string) {  
    console.log("收到数据:" + data)  
}  

}
DataFetchDelegate.swift代码：
protocol DataFetchDelegate: AnyObject {
func didReceiveData(_ data: String)
}
日志如下：
10:35:50.447 App Launch at App.vue:4
10:35:50.448 App Show at App.vue:7
10:35:57.509 testScanCodeListener at pages/index/index.vue:24
10:35:57.511 open scan view at uni_modules/ula-barscan/utssdk/app-ios/index.uts:5
10:35:57.511 scan view did loaded.delegate: ‍[⁠ParentViewController⁠]‍ { ⁠...⁠ }
10:36:18.985 onDecodedBarcodesReceived,self.delegate start: null
10:36:18.986 onDecodedBarcodesReceived,self.delegate end: null
10:36:18.986 scaned: QA1106QQ558
10:36:21.094 App Hide at App.vue:10
目前遇到的问题是：为什么调用代理方法时，delegate是空的呢，在view did loaded方法里面显示的是有值的，到用的时候为什么是 null 了？

ParentViewController 是在哪创建的？怎么创建的？得保证这个控制器不被提前释放