Install IPA using Swift

I am developing a jailbreak APP , I would like to know how to install a .ipa that I downloaded from my server to install on my device (iPhone and iPad) . My application does not promote piracy, it just downloads other apps from the same developer, that is, my apps.

I was able to download the apps to the Documents folder, but I do not know what else to do with them. I have already tried to extract and paste in the Applications folder, without result. I tried to install it in the trash folder and it worked but it did not to uninstall in normal mode. Could someone help me?

Follow the code:

 import UIKit;
    import Foundation;
    class ViewController: UIViewController {
    var label : UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: 400, height: 100));

    var down : Bool = false;
    var ApplicationsFolder : String = "";

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        label.text = "Nothindo to Say!";
        label.textAlignment = NSTextAlignment.Center;
        label.center = CGPointMake(100, 100);
        view.addSubview(label);
    }
    @IBAction func respring(){
        setuid(0); system("sudo reboot");
    }

    @IBAction func download(){
        if(down == false){
            var folderOrError : String = self.searchFolder();

            if(folderOrError.rangeOfString("error") == nil){
                self.down = true;
                self.ApplicationsFolder = folderOrError;

                label.text = "Baixando...";
                setuid(0);
                self.downloadPdf();

            }else{
                self.down = false;
                label.text = "Não foi possivel localizar a pasta de Applicativos!";
            }
        }
        //system("cd Applications \n ls");
    }

    func searchFolder() -> String {
        var paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        //v//ar paths = NSSearchPathForDirectoriesInDomains(folderMine, .UserDomainMask, true);
        var documentsDirectory : String;
        documentsDirectory = "/var/stash/";//paths[0] as String
        var fileManager: NSFileManager = NSFileManager()

        var fileList: NSArray = fileManager.contentsOfDirectoryAtPath(documentsDirectory, error: nil)!

        for s in fileList {

            var temp : String = s as String;
            var contenad : String = documentsDirectory+temp+"/";
            //println(contenad);
            if( contenad.rangeOfString(".lnk") == nil){
                var applicationList : NSArray = fileManager.contentsOfDirectoryAtPath(contenad, error: nil)!

                for n in applicationList {
                    var temp1 : String = n as String;
                    if(temp1.rangeOfString("Applications") != nil ){
                        return contenad+"Applications/";
                    }
                }
            }

        }


        return "error";
    }

    func fileExist(documentsDirectory : String, fileName : String) -> Bool {
        var fileManager: NSFileManager = NSFileManager()

        var fileList: NSArray = fileManager.contentsOfDirectoryAtPath(documentsDirectory, error: nil)!

        for s in fileList {

            var temp : String = s as String;

            if( temp.rangeOfString(fileName) == nil){
                return true;
            }

        }


        return false;
    }

    func saveFile(fileContent : String, file : String){
        let dirs : [String]? = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String]

        println(dirs![0]);

        if ((dirs) != nil) {
            let dir = dirs![0]; //documents directory
            let path = dir.stringByAppendingPathComponent(file);
            let text = fileContent;

            //writing
            text.writeToFile(path, atomically: false, encoding: NSUTF8StringEncoding, error: nil);

            //reading
            let text2 = String(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: nil)
        }
    }

    /*func downloadPdf()
    {
        let url = NSURL(string: "http://127.0.0.1/repo/download.php")
            let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {(data, response, error) in
            var returnMsg = NSString(data: data, encoding: NSUTF8StringEncoding)!;
            self.saveFile(returnMsg, file: "fileb.ipa");
        }

        task.resume()




    }*/



    func downloadPdf()
    {
        var request = NSURLRequest(URL: NSURL(string: "http://10.0.1.8/repo/PixlrExpressPlus.zip")!)
        let session = AFHTTPSessionManager()

        var progress: NSProgress?

        var downloadTask = session.downloadTaskWithRequest(request, progress: &progress, destination: {(data, responce) in self.pathUrl;
            },
            completionHandler:
            {
                response, localfile, error in
                /*println("response do download \(localfile)")

                self.label.text = "Downloaded";
                let aString: String = localfile.absoluteString!;
                let newString = aString.stringByReplacingOccurrencesOfString("file://", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil);

                let folderFile = newString.stringByReplacingOccurrencesOfString(".zip", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil);

                //system("ditto");
                //system("sudo chmod 777 \(newString)");
                //system("mkdir /var/mobile/Application/UHeuEHuHEuehuHEuHEuHEuEH");
                system("mv \(newString) /var/mobile/Application//filea.ipa")
                //system("cd Application \n ls");

                let dirs : [String]? = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String];
                let dir = dirs![0];
                SSZipArchive.unzipFileAtPath(newString, toDestination: dir);
                self.label.text = "Instalando..";
                setuid(0);
                system("chmod -R 777 \(folderFile)");
                //system("sudo mv -f \(newString) /var/mobile/Media/Downloads/myNewApp.ipa");
                system("dpkg -b \(folderFile)");
                self.label.text = "deu erro";
                //UIApplication.sharedApplication().openURL(NSURL(string: aString)!)*/
                self.label.text = "Instalando...";
                let aString: String = localfile.absoluteString!;
                let newString = aString.stringByReplacingOccurrencesOfString("file://", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil);



                let folderFile = newString.stringByReplacingOccurrencesOfString(".zip", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil);

                SSZipArchive.unzipFileAtPath(newString, toDestination: folderFile);

                let appFile = folderFile+"/PixlrExpressPlus.app";
                setuid(0);
                //println("(sudo mv -f \(appFile) \(self.ApplicationsFolder)PixlrExpressPlus.app)");
                system("sudo mv -f \(appFile) \(self.ApplicationsFolder)PixlrExpressPlus.app");
                if( self.fileExist(self.ApplicationsFolder, fileName: self.ApplicationsFolder+"PixlrExpressPlus.app")){
                    setuid(0); system("sudo chmod -R 777 \(self.ApplicationsFolder)PixlrExpressPlus.app");
                    self.label.text = "Instalado com Sucesso! Por Favor, Respringue!";
                    //system("killall SpringBoard");
                }else{
                    self.label.text = "Deu problema com o Root!";
                }

        })



        downloadTask.resume();

    }

    var pathUrl: NSURL{

        let dirs : [String]? = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String];
        let dir = dirs![0];

        let path = dir.stringByAppendingPathComponent("PixlrExpressPlus.zip");
        //let diceRoll = Int(arc4random_uniform(7));
        let url = NSURL(fileURLWithPath: path);//self.ApplicationsFolder+"temporari\(diceRoll).zip");

        return url!;
    }



    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}