How can I link a file download with a Progress View

Question

My button code below download a file from a URL, I need to link it with a Progress View to show the Downloading Progress.

@IBAction func btnStream(sender: U         


        

Answer 1

Check this tutorial. It's in Objective-C, but it will be easy to convert to Swift.

The principle is to implement some NSURLConnectionDataDelegatefunctions on your VC :

• connection:didReceiveResponse -> You can retrieve the size of the file that will be downloaded and estimate the download percentage with it.
• connection:didReceiveData -> It's the refresh function, it will be called multiple times during the download. You can compare the size of your incomplete NSData object with the size of the file.
• connectionDidFinishLoading -> This method is called at the end of the download process.

Hope it helps, and don't hesitate to comment if you have some troubles converting Obj-C to Swift.