Question

我在课堂上创建了一个扩展，以符合协议＆＃39; STPPaymentContextDelegate＆＃39;。出于某种原因，编译器抱怨，即使我在扩展中的所有方法都像这样正确地声明。

extension PaymentPopupViewController: STPPaymentContextDelegate {

func paymentContext(_ paymentContext: STPPaymentContext, didFailToLoadWithError error: Error) {
    self.delegate?.paymentPopupViewController(controller: self, didFinishPerhapsWithError: error as NSError?)
}

func paymentContextDidChange(_ paymentContext: STPPaymentContext) {
    if paymentContext.loading {
        self.indicatorView.startAnimating()
    } else {
        self.indicatorView.stopAnimating()
        if paymentContext.selectedPaymentMethod == nil {
            self.presentPaymentMehtodsViewController()
        }
    }
    self.indicatorView.isHidden = !paymentContext.loading
    self.paymentMethodLabel.isHidden = paymentContext.loading
    self.changePaymentMethodButton.isEnabled = !paymentContext.loading
    self.payButton.isEnabled = !paymentContext.loading && paymentContext.selectedPaymentMethod != nil
    self.paymentMethodLabel.text = paymentContext.selectedPaymentMethod?.label
}

func paymentContext(_ paymentContext: STPPaymentContext, didCreatePaymentResult paymentResult: STPPaymentResult, completion: STPErrorBlock) {
    fatalError("Method isn't implemented because our backend makes a charge, not the app.")

}

func paymentContext(_ paymentContext: STPPaymentContext, didFinishWith status: STPPaymentStatus, error: Error?) {
    if status == .userCancellation {
        return
    }
    self.delegate?.paymentPopupViewController(controller: self, didFinishPerhapsWithError: error as NSError?)
}

以下是协议规定的委托方法：

@protocol STPPaymentContextDelegate <NSObject>

- (void)paymentContext:(STPPaymentContext *)paymentContext didFailToLoadWithError:(NSError *)error;
- (void)paymentContextDidChange:(STPPaymentContext *)paymentContext;
- (void)paymentContext:(STPPaymentContext *)paymentContext
didCreatePaymentResult:(STPPaymentResult *)paymentResult
        completion:(STPErrorBlock)completion;
- (void)paymentContext:(STPPaymentContext *)paymentContext
didFinishWithStatus:(STPPaymentStatus)status
             error:(nullable NSError *)error;

如何解决此问题？

Answer 1

您的实施中存在一些错误。

替换此

func paymentContext(_ paymentContext: STPPaymentContext, didFailToLoadWithError error: Error)

使用

func paymentContext(_ paymentContext: STPPaymentContext, didFailToLoadWithError error: NSError)

并替换此

func paymentContext(_ paymentContext: STPPaymentContext, didFinishWith status: STPPaymentStatus, error: Error?)

使用

func paymentContext(_ paymentContext: STPPaymentContext, didFinishWithStatus status: STPPaymentStatus, error: NSError?)

类型MyViewController不符合协议＆＃39; STPPaymentContextDelegate＆＃39;

1 个答案: