Create a NSSet from NSArray based on property

Question

How does one create a NSSet of objects from an array based on a property.

e.g. Array of objects, each with a strong reference to a type pro

Answer 1

You would use:

NSSet* mySetWithUniqueItems= [NSSet setWithArray: yourArray];

This should work regardless of the type of objects in your array and would populate the NSSet with only one occurence of any duplicate objects in your array.

I hope this helps.

Update: Next best thing: is use concatenation of class name and object property first then use the above method.

self.concatenatedArray=[NSMutableArray arrayWithCapacity:4];

for (TheClass* object in self.myArray)
    [self.concatenatedArray addObject:[NSString stringWithFormat:@"%@-%@",[object class], object.theProperty]];

self.mySet=[NSSet setWithArray:self.concatenatedArray];

I am not sure what you will use the NSSet output for but you can probably modify the concatenation elements to have the information you need in the NSSet output.