ios - 无法使用 Swift 从 UIViewController 访问自定义 View

Question

我正在使用自定义 View 处理信用卡扫描仪。我试过下面的代码，但无法访问自定义类。你能请任何人帮我解决这个问题吗？下面附上错误截图。谢谢...

let BUTTON_SIZE = CGSize(width: 100, height: 20)
let BUTTON_BUFFER = 10

protocol GymCreditCardScannerViewDelegate: class {
    func creditCardScannerDidCancel(_ scanner: Any?)
    func creditCardScanner(_ scanner: Any?, scannedNumber number: String?)
}

import UIKit

class GymCreditCardScanner: UIView, CardIOViewDelegate {

    weak var scannerdelegate: GymCreditCardScannerViewDelegate?

    var cardIOView: CardIOView?
    var cancelButton: UIButton?
    var doneButton: UIButton?
    var number = ""
    var screenFrame = CGRect.zero
    var innerFrame = CGRect.zero

    func initIntoView(_ superView: UIView?, withDelegate delegate: Any?) -> Any? {

        let frame = CGRect(x: 0, y: 0, width: superView?.frame.size.width ?? 0.0, height: superView?.frame.size.height ?? 0.0)

        self.scannerdelegate = delegate as? GymCreditCardScannerViewDelegate
        screenFrame = frame
        let MARGIN: CGFloat = 0.05
        innerFrame = CGRect(x: frame.size.width * MARGIN, y: frame.size.height * MARGIN, width: frame.size.width * (1 - 2 * MARGIN), height: frame.size.height * (1 - 2 * MARGIN))
        cardIOView = CardIOView(frame: innerFrame)
        cardIOView?.delegate = self as CardIOViewDelegate
        cardIOView?.hideCardIOLogo = true
        cardIOView?.scannedImageDuration = 0.1
        addSubview(cardIOView!)
        let buttonSize: CGSize = BUTTON_SIZE
        cancelButton = UIButton(frame: CGRect(x: frame.size.width / 2 - buttonSize.width / 2, y: innerFrame.origin.y + innerFrame.size.height - buttonSize.height - CGFloat(BUTTON_BUFFER), width: buttonSize.width, height: buttonSize.height))
        cancelButton?.setTitle("Cancel", for: .normal)
        cancelButton?.addTarget(self, action: Selector(("handleCancelPress:")), for: .touchUpInside)
        addSubview(cancelButton!)
        superView?.addSubview(self)

        return self
    }

    func remove() {
        if (cardIOView != nil) {
            cardIOView?.removeFromSuperview()
        }
        cardIOView = nil
        removeFromSuperview()
    }

    func cardIOView(_ cardIOView: CardIOView!, didScanCard cardInfo: CardIOCreditCardInfo!) {

        number = cardInfo.cardNumber
        UIGraphicsBeginImageContextWithOptions(cardIOView.frame.size, true, 1)
        if let aContext = UIGraphicsGetCurrentContext() {
            cardIOView.layer.render(in: aContext)
        }
        let capture: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        let captureView = UIImageView(image: capture)
        captureView.frame = cardIOView.frame
        addSubview(captureView)
        bringSubview(toFront: cancelButton!)
        cardIOView.removeFromSuperview()
        let frame: CGRect = screenFrame
        let buttonSize: CGSize = BUTTON_SIZE
        doneButton = UIButton(frame: CGRect(x: frame.size.width / 2 - buttonSize.width / 2, y: innerFrame.origin.y + innerFrame.size.height - buttonSize.height - CGFloat(BUTTON_BUFFER), width: buttonSize.width, height: buttonSize.height))
        doneButton?.setTitle("Done", for: .normal)
        doneButton?.addTarget(self, action: Selector(("handleDonePress:")), for: .touchUpInside)
        addSubview(doneButton!)
        doneButton?.alpha = 0

        UIView.animate(withDuration: 0.075, delay: 0, options: .curveEaseOut, animations: {
            self.doneButton?.alpha = 1
            self.doneButton?.frame = CGRect(x: frame.size.width / 2 - buttonSize.width / 2 + (buttonSize.width + CGFloat(BUTTON_BUFFER)) / 2, y: self.innerFrame.origin.y + self.innerFrame.size.height - buttonSize.height - CGFloat(BUTTON_BUFFER), width: buttonSize.width, height: buttonSize.height)
            self.cancelButton?.frame = CGRect(x: frame.size.width / 2 - buttonSize.width / 2 - (buttonSize.width + CGFloat(BUTTON_BUFFER)) / 2, y: self.innerFrame.origin.y + self.innerFrame.size.height - buttonSize.height - CGFloat(BUTTON_BUFFER), width: buttonSize.width, height: buttonSize.height)
        }, completion: nil)
    }

    func handleCancelPress(_ sender: Any?) {
        scannerdelegate?.creditCardScannerDidCancel(self)
    }

    func handleDonePress(_ sender: Any?) {
        scannerdelegate?.creditCardScanner(self, scannedNumber: number)
    }
}

我的 View Controller

class PaymentDetailsVC: UIViewController {

var scanner: GymCreditCardScanner?

//MARK: Credit card scanning
    @IBAction func scanCreditCard(_ sender: Any) {
        cardField.resignFirstResponder()
        scanner = GymCreditCardScanner.initIntoView(view, withDelegate: self)
    }

    func creditCardScannerDidCancel(_ scanner: Any?) {
        scanner.remove()
    }

    func creditCardScanner(_ scanner: Any?, scannedNumber number: String?) {
        scanner.remove()
        scanner = nil
        numberField.text = number
    }
}

Answer 1

只需替换 var scanner: GymCreditCardScanner?//scanner 为 nil 值，您必须对其进行初始化

与

lazy var scanner: GymCreditCardScanner = GymCreditCardScanner()