ios - Swift - Unable to read/write from file -

i'm not sure whether i'm not able read or unable write. i'm pretty sure writing works. i'm using swift.

here project files.

i'm trying write array of arrays file, , read array of arrays when app launches. here's code writing , reading, respectively. listoftasks array of arrays variable.

writing:

let cocoaarray : nsarray = listoftasks cocoaarray.writetofile(string(fileurl), atomically: true) 

reading:

listoftasks = nsarray(contentsoffile: string(fileurl)) as! [array<string>] 

fileurl:

let documentsdirectory = nsfilemanager.defaultmanager().urlsfordirectory(.documentdirectory, indomains: .userdomainmask).last  let fileurl = documentsdirectory!.urlbyappendingpathcomponent("file.txt") 

i'm happy provide additional information necessary. in advance!

not sure where's problem, here's full working playground sample:

let fileurl = nsurl(fileurlwithpath: "/tmp/foo.plist") // path here let array = [["mon", "tue", "wed", "thu", "fri", "sat", "sun"], ["one", "two", "three"]] // array of arrays here  // save file (array nsarray).writetourl(fileurl, atomically: true)  // read file let savedarray = nsarray(contentsofurl: fileurl) as! [[string]]  print(savedarray)