How to best compare two NSString objects while ignoring case?

Question

I want to compare two strings. It fails when the string have capital letter. How do I convert both string to capitalize and compare.

I have a sample code, can someone correct this.

if ([[txtAnswer.text capitalizedString] isEqualToString:[answer capitalizedString]]) {
     // Do somehing
 }

Answer 1

If you look at the NSString class reference you will see under the heading Identifying and Comparing Strings the methods caseInsensitiveCompare: and localizedCaseInsensitiveCompare:.