gistfile1.m

/* 配列の配列からオブジェクトを検索しindexPathを返す */

- (NSIndexPath *)indexPathOfItem:(id)item {
	__block NSIndexPath *indexPath = nil;
	
	[groups_ enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
		NSInteger row = [(NSArray *)obj indexOfObject:item];
		if (row != NSNotFound) {
			indexPath = [NSIndexPath indexPathForRow:row inSection:idx];
			*stop = YES;
		}
	}];
	
	return indexPath;
}