IOS - Convert from NSSet to NSMutableSet

Question

Given an NSSet what is the best way to get an NSMutableSet with those same objects?

To be clear if you have an instance of NSSet what would be the most performant and simple way to get an NSMutable set with those same objects?

Answer 1

There are 2 ways to achieve it.

• Use mutableCopy

  Objective-C

  NSMutableSet* mutableSet2 = [YOUR_SET mutableCopy];
  

  Swift

  let mutableSet = YOUR_SET.mutableCopy()
  

• Use setWithSet:

  Objective-C

  NSMutableSet* mutableSet = [NSMutableSet setWithSet:YOUR_SET];
  

  Swift

  let mutableSet = NSMutableSet.init(set: YOUR_SET)