Learning Objective-C 2.0: A Hands-on Guide to Objective-C for Mac and iOS Developers, Second Edition

10. Control Structures in Objective-C

Chapter 1, “C, the Foundation of Objective C,” covered the basic C language control statements used for looping and branching: if, for, and while. This chapter examines how these statements are typically used in an Objective-C setting. It also covers some additional Objective-C looping constructs, including the Fast Enumeration feature that is new with Objective-C 2.0. Finally, it covers Objective-C’s exception system.

if Statements

As noted in Chapter 3, “An Introduction to Object-Oriented Programming,” Objective-C defines its own Boolean type, BOOL, and the constants YES and NO to represent true and false. A message expression using a method that returns a BOOL, such as the NSArray method containsObject: ...