Advanced Mac OS X Programming: The Big Nerd Ranch Guide

Accessing Enclosing Scope

Blocks can also access their enclosing scope. Say you wanted to print out each of the words that contains “badger.” You can use a variation of the previous code, using -enumerateObjectsUsingBlock:

[​a​r​r​a​y​ ​e​n​u​m​e​r​a​t​e​O​b​j​e​c​t​s​U​s​i​n​g​B​l​o​c​k​:​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​^​(​i​d​ ​o​b​j​e​c​t​,​ ​N​S​U​I​n​t​e​g​e​r​ ​i​n​d​e​x​,​ ​B​O​O​L​ ​*​s​t​o​p​)​ ​{​ ​ ​ ​ ​ ​ ​ ​ ​N​S​R​a​n​g​e​ ​m​a​t​c​h​ ​=​ ​[​o​b​j​e​c​t​ ​r​a​n​g​e​O​f​S​t​r​i​n​g​:​ ​@​"​b​a​d​g​e​r​"​]​;​ ​ ​ ​ ​ ​ ​ ​ ​i​f​ ​(​m​a​t​c​h​.​l​o​c​a​t​i​o​n​ ​!​=​ ​N​S​N​o​t​F​o​u​n​d​)​ ​{​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​N​S​L​o​g​ ​(​@​"​f​o​u​n​d​ ​a​ ​'​%​@​'​ ​:​ ​%​@​"​,​ ​@​"​b​a​d​g​e​r​"​,​ ​o​b​j​e​c​t​)​;​ ​ ​ ​ ​ ​ ​ ​ ​}​ ​ ​ ​ ​}​]​;​ ...