Question

My model class has a NSMutableDictionary with my data. In my view class, I want to display that data in my UITableView cellforRowAtIndexPath method. My view class has an NSArray for the data to display.

I can do this to get my data into my NSArray to display correctly:

self.CategoriesArray = [model.CategoryDictionary allKeys];

However, since NSMutableDictionary does not sort on its own, my items in my TableView are not in alphabetical order. I thought I could do this:

However, I get the following error:

2Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFBoolean localizedCaseInsensitiveCompare:]: unrecognized selector sent to instance 0x13d0a20'

I’m assuming that’s because my view class doesn’t know what to do with the localizedCaseInsensitiveCompare method.

How do I solve this problem? Thanks.

Answer 1

I think you were saying that this gives you the correct results, just not in order, right?

self.CategoriesArray = [model.CategoryDictionary allKeys];

If that’s the case, then this will give you the correct order if I’m understanding your question correctly:

NSArray* keys = [model.CategoryDictionary allKeys];

self.CategoriesArray = [keys sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];