Accessing code in Swift 3 Error

swift 4 get error code
swift error localizeddescription
catch block is unreachable because no errors are thrown in 'do block
swift error to nserror
swift print(error)
swift error debugdescription
errors thrown from here are not handled
error cannot be constructed swift

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.

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

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

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 {  //
    case .unknown: break
    case .paymentCancelled: break
    case .clientInvalid: break
    case .paymentInvalid: break
    case .paymentNotAllowed: break
    case .cloudServiceNetworkConnectionFailed: break
    case .cloudServicePermissionDenied: break
    case .storeProductNotAvailable: break

No need for rawValue.

Swift 3: get error code, I have a small problem, while I upgraded my App to Swift 3. Previously I the problem now is, that I can't access the error code with the following statement:. I think all the swift serie's are affected. Qualtity control of the 1803 was terrible, also other brands have a lot of problems with the update so purchasing another won't help. Or it would be a chromebook or apple :P

Another option to access code and domain properties in Swift 3 Error types is extending it as follow:

extension Error {
    var code: Int { return (self as NSError).code }
    var domain: String { return (self as NSError).domain }

Swift's error, Swift's enumerations are well suited to represent simple errors. The next code sample shows a possible extension to the Int type that parses the cases of your custom error type and access their associated values, as in the example below. SWIFT always uses a secure connection to ask for your e-mail address and password. The URLs used by SWIFT start with "" or "". 3.2 Verify the certificate on HTTPS websites. In most browsers this is done by clicking on the lock symbol either at the top or the bottom of the browser window.

Now in Xcode 8 and swift 3 the conditional cast is always succeeds, so you need do following:

let code = (error as NSError).code

and check the code for your needs. Hope this helps

Error Handling, Reference Counting · Memory Safety · Access Control · Advanced Operators Swift provides first-class support for throwing, catching, propagating, and For example, the following code throws an error to indicate that five additional coins catch pattern 3, pattern 4 where condition {; statements; } catch {; statements; }. I would like to retrieve the HTTP response status code (e.g. 400, 401, 403, 503, etc) for request failures (and ideally for successes too). In this code, I am performing user authentication with HTTP Basic and want to be able to message the user that authentication failed when the user mistypes their password.

This is correct (Apple's own tests use this approach):

if error._code == SKError.code.paymentCancelled.rawValue { ... }

On the other hand, casting to NSError will probably be deprecated soon:

let code = (error as NSError).code // CODE SMELL!!
if code == SKError.code.paymentCancelled.rawValue { ... }

Beginning iPhone Development with Swift 3: Exploring the iOS SDK, Exploring the iOS SDK Molly Maskrey, Kim Topley, David Mark, Fredrik Olsson, JEFF LAMARCHE "Access Denied": "Error \(error.code)" let alertController  set "Bridging-Header.h" for the "Objective-C Bridging Header" setting in Build Settings under "Swift Compiler - Code Generation" You will then be able to access all of the c methods like sqlite3_open from your swift code.


error._code == NSURLErrorCancelled

to match the error code.

Mastering Swift 3, struct TestStruct { // Type only available for iOS 9 or above } In the previous example, we type can only be accessed if the code is run on a device that has iOS version 9 or above. In this chapter, we looked at Swift's error-handling features. For this part of the SQLite with Swift tutorial, click the Making It Swift link at the bottom of the playground: Wrapping Errors. Getting errors from the C API is a bit awkward as a Swift developer. Checking a result code and then calling another function doesn’t make sense in this new world.

Swift (programming language), Swift is a general-purpose, multi-paradigm, compiled programming language developed by Through version 3.0 the syntax of Swift went through significant evolution, Apple planned to make source code converters available if needed for the full Unlike many object-oriented languages, these access controls ignore  Types¶ In Swift, there are two kinds of types: named types and compound types. A named type is a type that can be given a particular name when it’s defined. Named types include classes, structures, enumerations, and protocols. For example, instances of a user-defined class named MyClass have the type MyClass. In addition to user-defined

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Mastering Swift 3, It is recommended that we use error handling in our code. Chapter 9, Custom Subscripts in Swift can be used to access elements in a collection. We can also  Sep 12, 2016. Working with JSON in Swift If your app communicates with a web application, information returned from the server is often formatted as JSON.You can use the Foundation framework’s JSONSerialization class to convert JSON into Swift data types like Dictionary, Array, String, Number, and Bool.