在 Swift 3 错误中访问代码 [英] Accessing code in Swift 3 Error

问题描述

Xcode 8 beta 4 中的新功能，NSError 桥接到 Swift Error 协议类型.这会在处理失败的 SKPaymentTransaction 时影响 StoreKit.您应该检查以确保错误没有因为事务被取消而发生，以了解是否向用户显示错误消息.您可以通过检查错误的code 来做到这一点.但是使用 Error 而不是 NSError，没有定义 code.我一直无法弄清楚如何从 Error 正确获取错误代码.

New in Xcode 8 beta 4, NSError is bridged to the Swift Error protocol type. This affects StoreKit when dealing with failed SKPaymentTransactions. You ought to check to be sure the error didn't occur because the transaction was cancelled to know whether or not to show an error message to the user. You do this by examining the error's code. But with Error instead of NSError, there is no code defined. I haven't been able to figure out how to properly get the error code from Error.

这适用于以前版本的 Swift 3:

This worked in the previous version of Swift 3:

func failedTransaction(_ transaction: SKPaymentTransaction) {
    if let transactionError = transaction.error {
        if transactionError.code != SKErrorCode.paymentCancelled.rawValue {
            //show error to user
        }
     }
     ...
}

既然 error 是 Error 而不是 NSError，code 不是成员.

Now that error is an Error not NSError, code is not a member.

推荐答案

Casting to SKError 似乎在 xCode 8 和 Swift 3 中对我有用...

Casting to SKError seems to be working for me in xCode 8 and Swift 3...

    guard let error = transaction.error as? SKError else {return}
    switch error.code {  // https://developer.apple.com/reference/storekit/skerror.code
    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.

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