How to compare A to Á on the iPhone

问题

I need to compare 2 strings, looking at the first letter only.

Is there a method to compare A to Á, and recognize it as A, without the ´?

回答1:

NSString has a diacritic-insensitive comparison mode which will do what you're after.

// should return NSOrderedSame, i.e. identical
[@"Apple" compare:@"Ápple" 
          options:NSDiacriticInsensitiveSearch]

If you want it to be case-insensitive as well:

// ditto
[@"APPLE" compare:@"Ápple" 
          options:NSDiacriticInsensitiveSearch | NSCaseInsensitiveSearch] 

来源：https://stackoverflow.com/questions/4418997/how-to-compare-a-to-%c3%81-on-the-iphone