NSData(contentsOfURL: url) always returning nil

Question

I have this code in a new playground

import Foundation

let blogsURL: NSURL = NSURL(fileURLWithPath: "/Users/Francis/Documents/Xcode_projects/KM registratie/blogs.json")
let data = NSData(contentsOfURL: blogsURL)

On the second line the playground tells me that it (correctly) initialised the URL referring to file:///Users/Francis/Documents/Xcode_projects/KM%20registratie/blogs.json and on the third line the playground tells me that data is nil

I already googled around but no question seems to be the exact same problem. I found this "NSData contentsOfURL constructor returns nil", but neither restarting Xcode nor restarting my entire computer fixes the problem.

Not sure about the %20, but it should probably be an escaped space instead of encoded : "/Users/Francis/Documents/Xcode_projects/KM\ registratie/blogs.json" — Wain
you only escape when you don't put parentheses around a path right? In that case there's no need to escape the space. But I tried it anyway, it gives a syntax error on the back slash — Fr4nc3sc0NL
I guess, the playground is in its own sandbox and cannot access files outside. — vadian
I already answered the question, thanks to @vadian, but I do wonder now if %20 is appropriate in a system path :p — Fr4nc3sc0NL
@Fr4nc3sc0NL any space character in an URL has to be percent escaped even in a file system URL — vadian

Fr4nc3sc0NL Fr4nc3sc0NL · Accepted Answer · 2015-11-13T17:46:05

playgrounds are sandboxed and it seems that there isn't an easy way to reach outside their "box". XML parsing in swift the title of this question is a bit misleading, the answer on it does answer this question

NSData(contentsOfURL: url) always returning nil

2 Answers