Case insensitive comparison NSString
if( [@"Some String" caseInsensitiveCompare:@"some string"] == NSOrderedSame ) { // strings are equal except for possibly case}The documentation is located at Search and Comparison Methods
NSString *stringA; NSString *stringB; if (stringA && [stringA caseInsensitiveCompare:stringB] == NSOrderedSame) { // match }Note: stringA && is required because when stringA is nil:
stringA = nil; [stringA caseInsensitiveCompare:stringB] // return 0and so happens NSOrderedSame is also defined as 0.
The following example is a typical pitfall:
NSString *rank = [[NSUserDefaults standardUserDefaults] stringForKey:@"Rank"]; if ([rank caseInsensitiveCompare:@"MANAGER"] == NSOrderedSame) { // what happens if "Rank" is not found in standardUserDefaults }
An alternative if you want more control than just case insensitivity is:
[someString compare:otherString options:NSCaseInsensitiveSearch];Numeric search and diacritical insensitivity are two handy options.