Convert NSArray to NSDictionary

Question

How can I convert an NSArray to an NSDictionary, using an int field of the array\'s objects as key for the NSDictionary?

Answer 1

I have created a simple library, called Linq to ObjectiveC, which is a collection of methods that makes this kind of problem much easier to solve. In your case you need the Linq-to-ObjectiveC toDictionary method, where your 'int' field is specified via a key selector:

NSDictionary* dictionary = [sourceArray toDictionaryWithKeySelector:^id(id item) {
    return [item intField];
}];

This returns a dictionary where the keys are given by the intField in the source array.