How to base64url Encode Strings in Cocoa Touch

Is there a library function/method/cla开发者_Python百科ss in Cocoa Touch for base64url encoding strings?

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While there isn't a standard way to do this with the Apple frameworks, you should certainly check out CocoaDev's entry and discussion on the topic: BaseSixtyFour. They have plenty of ways to work this out, and the last comment there doesn't require libcrypto, or any external frameworks (which, on iOS, is a good start). It's definitely worth a look.

Update: Or even better, check out Base64 encoding options on Mac and iPhone on CocoaWithLove, as it includes excellent source code.