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Editorial Team
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Asked: 2026-05-14T20:22:04+00:00

I am downloading an mp3 using NSData dataWithContentsOfURL:url. This takes a while and while

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I am downloading an mp3 using NSData dataWithContentsOfURL:url. This takes a while and while the file is downloading the application hangs. I want to handle well and ideal would like to show the download progress but can’t find methods for this.

It is in a UIViewController and I have made a first attempt by putting in a UIActivityIndicatorView and start it spinning before I start the download, then stop it spinning after but nothing appears.

So my question really is please could someone tell me what the best way to handle this is? Thanks so much

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1 Answer

  1. Editorial Team

    Nothing will appear because your main thread is blocked doing the download, and the main thread is where UI updates occur.

    You should use NSUrlConnection to download asynchronously and implement the delegate methods to start/stop your spinner.

    Alternatively if you want to stick with NSData‘s dataWithContentsOfURL:url you should do this on a separate thread and update the spinner on the main thread before and after you call it.

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