CODEWITHSUNDEEP
iosarraysswiftcollectionssprite-kit
Aeisys
Aeisys

Reputation: 367

Swift 4 Mutable Collection of Mutable Objects?

I want to create a pool of sprites that I can move around on the screen without having to reinitialize and add them to my scene over and over.

To do this, I want to store a collection of objects in a way that I can easily access and mutate the objects.

My initial thought was to use an Array, but it appears Swift passes back a copy of an object when I reference the array.

var nodes:[SKNodes] = SKNodes();
nodes.append(SKNode());

nodes[0].position = CGPoint(x: 100, y: 100) //doesn't work

What is the best practice for creating something like this?

EDIT:

It wasn't working due to a typo, silly me. For some reason I thought it wasn't working because Swift would pass by value, and I would get a copy of the object in the array instead of a reference to the object.

I have now learned that Swift passes Objects and Functions as a Reference Type, and basically only structs and enums are pass by value

Is Swift Pass By Value or Pass By Reference 

var nodes:[SKNode] = SKNodes();
nodes.append(SKNode());

nodes[0].position = CGPoint(x: 100, y: 100) //Works!

Upvotes: 2

Views: 248

Answers (1)

Özgür Ersil
Özgür Ersil

Reputation: 7013

Since you append SKNode to the Array, it should be [SKNode] instead of [SKNodes]

var nodes:[SKNode] = SKNodes();
nodes.append(SKNode());
nodes[0].position = CGPoint(x: 100, y: 100) //should work

Upvotes: 2

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