Cocoa® Programming

Support Types

In addition to classes, the Foundation framework includes several functions and types based on C structures. The NSTimeInterval type has already been mentioned. NSTimeInterval is implemented using the C double type. Structures that store points, sizes, and rectangles are defined in the Foundation framework. Another type used extensively is NSRange.

NSRange

NSRange is a C structure used to identify a location and a length. For example, an NSRange can be used to specify a range of characters to delete from a mutable string using NSMutableString’s –deleteCharactersInRange: method. The location is the index of the first character to delete. The length is the number of characters to delete. The NSRange structure is used by many Cocoa ...