A quick and dirty way of getting dictionary written to the Documents folder for a given app. You can provide a file name or take the default of data. The file name will be appended with ".plist" automatically.

Dictionary+SaveAsPlist.swift

public extension Dictionary where Key: StringLiteralConvertible, Value: AnyObject {
    public func saveAsPlist(fileName: String = "data") -> (successful: Bool, path: NSURL?) {
        guard let rootPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first else {
            print("No documents directory!")
            return (false, nil)
        }
        
        let url = NSURL(fileURLWithPath: rootPath)
        let plistPathInDocument = url.URLByAppendingPathComponent("\(fileName).plist")
        let dict = NSDictionary(objects: self.values.map{ $0 }, forKeys: self.keys.map{ String($0) })
        let ret = dict.writeToFile(plistPathInDocument.absoluteString, atomically: true)
        // print(ret)
        //let resultDictionary = NSMutableDictionary(contentsOfFile: plistPathInDocument.absoluteString)
        //print("Saved GameData.plist file is --> \(resultDictionary?.description)")
        
        return (ret, plistPathInDocument)
    }
}