Stephen Fox Stephen Fox - 4 days ago 5
iOS Question

How to create a mutable array of specific class type in Swift

I have a class called

Bullet
and I want to make a mutable array with this class type. Basically the desired outcome I want is, when a user touches the screen a new bullet is spawned. I know in Java you can use an
ArrayList
to achieve this by adding a new instance to the array list each time.

I'm not sure syntactically how I could achieve in Swift or if it is even possible.
This is the code I have for declaring and instance of the
Bullet
class but how do I make it so that it is a mutable array...

var bullet: Bullet = Bullet()


Thank you!

Answer

Its simple :

var bulletArray = [Bullet]() // this will declare and initialize the bulletArray

In the above line of code the type is inferred for the bulletArray.

If you explicitly want to specify the type then,

var bulletArray:[Bullet] = [Bullet]() // this will declare and initialize the bulletArray

If you just want to declare the array but not initialize then

var bulletArray:[Bullet]

If you just declare the array then you need to initialize it in init() before using it. Or else you can declare array as optional type. As shown below,

var bulletArray: [Bullet]?

HTH :)

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