The typical way to encode URLs (e.g. turn spaces into %20) was to use NSString’s
stringByAddingPercentEscapesUsingEncoding:
NSUTF8StringEncoding
As you may have noticed, that method has been deprecated in iOS 9. You now need to use
stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSet
which takes an NSCharacterSet as it’s argument. What NSCharacterSet am I supposed to use you may ask. I recently ran into this and found the following worked for me:
[NSCharacterSet URLFragmentAllowedCharacterSet]
The relevant Apple documentation can be found here.