Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
In this section we’ll look at two controls that report back different signals than the simple button-up or button-down control events. The first is the UITextField, the prime control for entering text, and the second is the relatively simple (but unique) UISlider. In the process, we’ll also explore the other text-based entry formats, because they share some unique issues with UITextField.
You have four ways to display pure text in the SDK: the UILabel, the UISearchBar, the UITextView, and the UITextField. Each has a slightly different purpose. The UILabel and the UISearchBar are intended for short snippets of text; the UITextView is intended for multiple lines. Each of those text objects except the UILabel is editable, but only the UITextField is a UIControl subclass with its own control events already defined.