Learning iOS UI Development

View-based components

The following controls are subclasses of UIView, and they are useful to display noninteractive information or act as containers.

Showing progress with UIProgressView

A progress view is an indicator of progress over time. You can see an example of this control during downloads or when sending an e-mail from the Mail app:

This control is extremely simple. The only property you need to set and read is progress, a value between 0.0 and 1.0. When this value is 0.0, the progress bar is empty, while it is full when its value is equal to 1.0. You can perform a simple animation if you set the progress value using the setProgress:animated: ...