NSC_BinarySearchNSArrayExample.m

@interface NSCBinarySearchExample() <>
@end

@implementation NSCBinarySearchExample

/**
* Find the index of a filename.
*/
- (NSUInteger)findFilename:(NSString *)filename
{
  // List contents of resource directory
  NSArray *resourceDirectoryListing = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[self resourceDirectoryPath] error:&error];
  
  // Sort alphabetically
  resourceDirectoryListing = [resourceDirectoryListing sortedArrayUsingSelector:@selector(compare:)];
  
  // Find filename index
  NSUInteger index = [resourceDirectoryListing indexOfObject:filename
                                               inSortedRange:NSMakeRange(0, [resourceDirectoryListing count])
                                                     options:NSBinarySearchingFirstEqual
                                             usingComparator:^NSComparisonResult(NSString *filename1, NSString *filename2) {
    return [filename1 compare:filename2];
  }];
  
  return index;
}

@end