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I'm trying to get nonce from Braintree. I have not found any documentation Braintree provided that how to get nonce from Braintree SDK in following documentation.

https://developers.braintreepayments.com/start/hello-client/ios/v4

Please let me know how to get nonce from Braintree iOs SDK

_{Full disclosure: I work at Braintree. If you have any further questions, feel free to contact support.}

Getting the nonce is documented in the Presenting Drop-in UI section of the page you linked. Once you have the Drop-in active, you need to implement a delegate so the Drop-in can find where to send the nonce it produces. Without a delegate like the one specified you won't receive the nonce from the Drop-in:
​

Then implement BTDropInViewControllerDelegate to obtain the payment method nonce on success, and dismiss the Drop In UI in either case:

- (void)dropInViewController:(BTDropInViewController *)viewController 
 didSucceedWithTokenization:(BTPaymentMethodNonce *)paymentMethodNonce 
 // Send payment method nonce to your server for processing
 [self postNonceToServer:paymentMethodNonce.nonce];
 [self dismissViewControllerAnimated:YES completion:nil];


 - (void)dropInViewControllerDidCancel:(__unused BTDropInViewController *)viewController 
 [self dismissViewControllerAnimated:YES completion:nil];

​
If you look at the first function you can see that a variable paymentMethodNonce (type: BTPaymentMethodNonce) is passed into your app. This sample code expects that you have another function (postNonceToServer) to actually handle the nonce once you get it.

You can get Payment nonce in drop in method by using
let nonce = result.paymentMethod!.nonce

Example :-

func showDropIn(clientTokenOrTokenizationKey: String) 
 let request = BTDropInRequest()
 let dropIn = BTDropInController(authorization: clientTokenOrTokenizationKey, request: request)
 (controller, result, error) in
 if (error != nil) 
 print("ERROR")
 else if (result?.isCancelled == true) 
 print("CANCELLED")
 else if let result = result 

 let nonce = result.paymentMethod!.nonce

 print( nonce)

 
 controller.dismiss(animated: true, completion: nil)
 
 self.present(dropIn!, animated: true, completion: nil)