Ios progress bar not updating

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I pick out the bits I want to keep and then format and print that data to a text file.

When the app starts up, it checks to see whether or not the text file is empty. I now want to show the user the progress of the data being retrieved via a progress bar. I cannot seem to get the progress bar to display before and during the data retrieval.

Now we will see how to use progress bars or indicators in i OS applications with example.

To create new project in i OS open Xcode from /Applications folder directory.

Once we open Xcode the welcome window will open like as shown below.