How can I get the description error from stripe? - swift

Question

I am integrating stripe in my app. The code works but I would like to get the description error and show it to user with a label in case something goes wrong (CC number not correct etc):
// other stuff here
STPAPIClient.sharedClient().createTokenWithCard(stripeCard) { (token, error) -> Void in
if let error = error {
print(error.userInfo)
}
else if let token = token {
self.createBackendChargeWithToken(token) { status in
if status == PKPaymentAuthorizationStatus.Success{
dispatch_async(dispatch_get_main_queue()){
self.paymentActivity.hidden = true
self.paymentActivity.stopAnimating()
self.paymentActivityLabel.text = "Transaction approved!"
}
}
}
}
}
}
when I print error.userInfo I get the following:
[com.stripe.lib:ErrorMessageKey: Your card number is incorrect.,
com.stripe.lib:CardErrorCodeKey: com.stripe.lib:IncorrectNumber,
com.stripe.lib:ErrorParameterKey: number,
NSLocalizedDescription: Your card's number is invalid]
How can I extrapolate NSLocalizedDescription?

Answer 1

An error.userInfo is usually an NSDictionary.
When you print this dictionary, there's no types like with a Swift dictionary, so the print function does not always recognize what are strings, and does not show double quotes. But your userInfo dictionary keys are still probably strings.
I would first try accessing the error value like this:
print(error.userInfo["NSLocalizedDescription"])
to verify that indeed NSLocalizedDescription is a string key.
A tip: hold ALT and CLICK on a variable, it will show you its type, it helps for quickly debugging in Xcode.