如何檢索 Swift 中潛在錯誤的描述？

Question

鑒於我有以下 Swift 錯誤：

Error Domain=SKErrorDomain Code=0 "UNKNOWN_ERROR" UserInfo={NSLocalizedDescription=UNKNOWN_ERROR, NSUnderlyingError=0x600002dfa430 {Error Domain=ASDErrorDomain Code=500 "Unhandled exception" UserInfo={NSUnderlyingError=0x600002dfa490 {Error Domain=AMSErrorDomain Code=100 "Authentication Failed" UserInfo={NSMultipleUnderlyingErrorsKey=(
    "Error Domain=AMSErrorDomain Code=2 \"An unknown error occurred. Please try again.\" UserInfo={NSLocalizedDescription=An unknown error occurred. Please try again.}",
    "Error Domain=AKAuthenticationError Code=-7003 \"(null)\""
), NSLocalizedDescription=Authentication Failed, NSLocalizedFailureReason=The authentication failed.}}, NSLocalizedFailureReason=An unknown error occurred, NSLocalizedDescription=Unhandled exception}}}

這個錯誤的localizedDescription是UNKNOWN_ERROR ，但是我想檢索名為Authentication Failed的底層錯誤。

如何在 Swift 中檢索此描述？

Answer 1

以下代碼給出了最后一個潛在錯誤。

extension NSError {
    
    var lastUnderlyingErrorDescription: String {
        if let underlyingError = userInfo[NSUnderlyingErrorKey] as? NSError {
            return underlyingError.lastUnderlyingErrorDescription // Recursion 😎
        }
        // LocalizedFailureReason is often - but not always - more expressive than localizedDescription.
        return localizedFailureReason ?? localizedDescription
        
    }
    
}