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7. Advanced UIKit Design > Progress Indicators

Progress Indicators

Progress indicators notify the user that an operation is in progress. There are two types of indicators supported in UIKit:

UIProgressIndicator

This class presents a spinning clock-like animation—the kind seen when turning on the iPhone’s WiFi or Bluetooth support, or when your Mac desktop boots up.

UIProgressBar

This class provides a thermometer-like readout, allowing the application to express how far along an operation is before completion.

Both types of indicators are derived from the UIView base class, meaning they can be layered on top of text views, alert sheets, most types of table cells, and any other object that derives from UIView.


  

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