iOS Programming: The Big Nerd Ranch Guide

Fast Enumeration

Before Objective-C 2.0, we iterated through arrays the way you did in your main function:

f​o​r​ ​(​i​n​t​ ​i​ ​=​ ​0​;​ ​i​ ​<​ ​[​i​t​e​m​s​ ​c​o​u​n​t​]​;​ ​i​+​+​)​ ​{​
 ​ ​ ​ ​B​N​R​I​t​e​m​ ​*​i​t​e​m​ ​=​ ​[​i​t​e​m​s​ ​o​b​j​e​c​t​A​t​I​n​d​e​x​:​i​]​;​
 ​ ​ ​ ​N​S​L​o​g​(​@​"​%​@​"​,​ ​i​t​e​m​)​;​
}​

Objective-C 2.0 introduced fast enumeration. With fast enumeration, you can write that code segment much more succinctly. Make the following change in main.m:

f​o​r​ ​(​i​n​t​ ​i​ ​=​ ​0​;​ ​i​ ​<​ ​[​i​t​e​m​s​ ​c​o​u​n​t​]​;​ ​i​+​+​)​ ​{​
 ​ ​ ​ ​B​N​R​I​t​e​m​ ​*​i​t​e​m​ ​=​ ​[​i​t​e​m​s​ ​o​b​j​e​c​t​A​t​I​n​d​e​x​:​i​]​;​
 ​ ​ ​ ​N​S​L​o​g​(​@​"​%​@​"​,​ ​i​t​e​m​)​;​
}​
 f​o​r​ ​(​B​N​R​I​t​e​m​ ​*​i​t​e​m​ ​i​n​ ...