Using UIActivityIndicatorView

Step 1: Add activity indicator to storyboard

Add the Activity Indicator View to your storyboard from the Object browser and check the animating property.

Step 2: Set default properties

Move the Activity Indicator View inside a button. Set the style of the Activity Indicator to be Large White. Select hidden when stopped and uncheck animating.

Step 3: Start animating on button tap

Add an outlet for the Activity Indicator View in your View Controller. Then, add a tap handler for your button. Inside the tap handler, tell the Activity Indicator View to start animating.