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I’m building an app right now that reaches out to a Web API and sometimes there is a little bit of a delay where currently nothing happens. What are options to show the user that the app is thinking about something? Any examples on how to implement and present a spinny wheel?
the simplest one is the UIActivityIndicator
https://developer.apple.com/documentation/uikit/uiactivityindicatorview
for showing the progress in a more elegant way you can use a heads up display,
https://github.com/matej/MBProgressHUD
http://iosdevelopertips.com/open-source/ios-open-source-svprogresshud-heads-up-display.html