Prevent app from backing up documents folder?

Question

I\'m trying to prevent my app backing up files to iCloud but have become completely confused and a little lost.

-EDIT-

I\'ve updated this to reflect the chan

Answer 1

In Swift:

//Path of document directory
var docPathAry : NSArray! = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
var docDirPathStr: AnyObject? = docPathAry.count > 0 ? docPathAry[0] : nil

self.addSkipBackupAttributeToItemAtURL(NSURL.fileURLWithPath(docDirPathStr as NSString))

and:

func addSkipBackupAttributeToItemAtURL(URL: NSURL!) -> Bool {
    assert(NSFileManager.defaultManager().fileExistsAtPath(URL.path))
    var err : NSError? = nil
    var success : Bool! = URL.setResourceValue(NSNumber.numberWithBool(true), forKey: NSURLIsExcludedFromBackupKey, error: &err)

    if(!success) {
        println("Error excluding \(URL.lastPathComponent) from backup\(err) ")
    }

    return success
}