How to unzip a big zip file containing one file and get the progress in bytes with swift?

You can try this code :

    SSZipArchive.unzipFileAtPath(filePath, toDestination: self.destinationPath, progressHandler: { 
(entry, zipInfo, readByte, totalByte) -> Void in
      //Create UIProgressView
      //Its an exemple, you can create it with the storyboard...
      var progressBar : UIProgressView?
      progressBar = UIProgressView(progressViewStyle: .Bar)
      progressBar?.center = view.center
      progressBar?.frame = self.view.center
      progressBar?.progress = 0.0
      progressBar?.trackTintColor = UIColor.lightGrayColor();
      progressBar?.tintColor = UIColor.redColor();
      self.view.addSubview(progressBar)

      //Asynchrone task                
      dispatch_async(dispatch_get_main_queue()) {
           println("readByte : \(readByte)")
           println("totalByte : \(totalByte)")                               

           //Change progress value
           progressBar?.setProgress(Float(readByte/totalByte), animated: true)
           //If progressView == 100% then hide it
           if readByte == totalByte {
               progressBar?.hidden = true
           }
       }
}, completionHandler: { (path, success, error) -> Void in
    if success {
        //SUCCESSFUL!!
    } else {
        println(error)
    }
})

I hope I have helped you!

Ysee

To achieve what you want, you will have to modify SSZipArchive's internal code.

SSZipArchive uses minizip to provide the zipping functionality. You can see the minizip unzipping API here: unzip.h.

In SSZipArchive.m, you can get the uncompressed size of the file being unzipped from the fileInfo variable.

You can see that the unzipped contents are being read here:

 FILE *fp = fopen((const char*)[fullPath UTF8String], "wb");
 while (fp) {
     int readBytes = unzReadCurrentFile(zip, buffer, 4096);
     if (readBytes > 0) {
         fwrite(buffer, readBytes, 1, fp );
     } else {
         break;
     }
 }

You will need the readBytes and the uncompressed file size to compute the progress for a single file. You can add a new delegate to SSZipArchive to send these data back to the calling code.