How to compare the NSString *

Question

Hi, everyone,

I want to compare 2 NSString *. I use the [[arr objectAtIndex: i]compare: @"compareString"] . However, it does not work in my program. What wrong of the problems?

Answer 1

Possible problems:

1. You have indexed off the end of the array causing a bounds exception
2. The array is nil meaning the compare would always result in equality
3. The object in the array does not respond to compare: causing an unrecognized selector exception
4. The object in the array is not a string causing compare: to fail

If you tell me what actually happens, I'll tell you which of the four possibilities is the issue.