A search bar (UISearchBar) is essentially a variety of text field, though it is not in fact a UITextField subclass. It is displayed as a rounded rectangle containing a magnifying glass icon, where the user can enter text (Figure 25-5). It does not, of itself, do any searching or display the results of a search; a common interface involves displaying the results of a search as a table, and a controller class, UISearchDisplayController, makes this easy to do (see Chapter 21).
Figure 25-5. A search bar with a search results button
A search bar’s current text is its
text property. It can have a
placeholder, which appears when there is no text. A
prompt can be displayed above the search bar to explain its purpose. Delegate methods (UISearchBarDelegate) notify you of editing events:
A search bar has a
barStyle, for which your choices are the same as for a toolbar or navigation bar: either
UIBarStyleBlack, and if the latter, either
translucent or not. Alternatively, the search bar may have a
tintColor; as with a toolbar, if this is set, the
barStyle is ignored. (See Chapter 19 and later in this chapter.) Because of this, a search bar looks good at the top of the screen, ...