stringByAddingPercentEscapesUsingEncoding not working with NSStrings with ' 0'

Question

I have been having some problem with the stringByAddingPercentEscapesUsingEncoding: method. Here\'s what happens:

When I try to use the method to conver

Answer 1

This happens when you're trying to encode to NSASCIIStringEncoding a string with characters not supported by ASCII.

Make sure you're encoding to NSUTF8StringEncoding, if the string can contain UTF8 characters or the method would return nil.