在Swift 3错误中访问代码

SKError

    guard let error = transaction.error as? SKError else {return}    switch error.pre {  // https://developer.apple.com/reference/storekit/skerror.pre    case .unknown: break    case .paymentCancelled: break    case .clientInvalid: break    case .paymentInvalid: break    case .paymentNotAllowed: break    case .cloudServiceNetworkConnectionFailed: break    case .cloudServicePermissionDenied: break    case .storeProductNotAvailable: break    }

不需要

rawValue