Override open variable for class in Swift and SpriteKit for use in XCode's ActionEditor - swift3

Question

I'm trying to make small platformer game, just in learning purposes. I've tried to animate character with array of SKTextures like this:
let animation: SKAction = SKAction.animate(
with: frames.map {
let texture : SKTexture = SKTexture(imageNamed: $0)
texture.filteringMode = SKTextureFilteringMode.nearest
return texture
},
timePerFrame: 0.15
)
frames variable is array of SKTextures. I've used map to set filtering mode for each texture. This works fine and dandy, but than i've discovered that i can create animations (actions) in ActionEditor in XCode with AnimateWithTextures action. And here lies my problem. This is much more efficient, but i can't change filtering mode for textures in animation in ActionEditor. I've looked into SKTexture class and saw this:
open class SKTexture : NSObject, NSCopying, NSCoding {
...
/**
The filtering mode the texture should use when not drawn at native size. Defaults to SKTextureFilteringLinear.
*/
open var filteringMode: SKTextureFilteringMode
...
}
If i'm not mistaken open means that i can override variable, but i don't know how. I want to set default value of filteringMode to SKTextureFilteringMode.nearest for all SKTextures so ActionEditor will use textures with texture filtering set to nearest neighbor.
Also if you know how to set filtering mode for textures in specific action – i would like to know how to do it too. Thanks

Answer 1

you can create a function to setup the animation for you, and create an extension to SKTexture with your custom init, and when your ready just call it to your node.
extension SKTexture { // Declare this extension outside your class decleration
convenience init(customImageNamed: String) {
self.init(imageNamed: customImageNamed)
self.filteringMode = .nearest
}
}
func setupAnimationWithPrefix(_ prefix: String, start: Int, end: Int, timePerFrame: TimeInterval) -> SKAction{
var textures = [SKTexture]()
for i in start...end{
textures.append(SKTexture(customImageNamed: "\(prefix)\(i)"))
}
return SKAction.animate(with: textures, timePerFrame: timePerFrame)
}
if you have 10 images named image1, image2, image3 ect..then this is how you would use this function
func runAction(){
let action = setupAnimationWithPrefix("image", start: 1, end: 10, timePerFrame: 0.1)
yourNode.run(action)
} // you can change timePerFrame to your liking i find 0.1 sec per frame the best

Answer 2

Unfortunately you can't override a variable without subclassing it, that is to do something like
class MyTexture: SKTexture {
from there, you could override the variable:
override var filteringMode: SKTextureFilteringMode {
get {
return .nearest
}
set {
}
}
That should work, but now you can't change the filtering mode, ever (without going through a bunch of hooplah).
So the more apt way would be to set the default value via the initializer, but SKTexture has no public designated initializers, so that option is out of the window.
So your best bet is going to be the convenience init extension by Arie, or just make a plain function that returns a new texture:
func nearestTexture(imageNamed name: String) -> SKTexture {
let newTex = SKTexture(imageNamed: name)
newTex.filteringMode = .nearest
return newTex
}
let texture: SKTexture = nearestTexture(imageNamed: "lol")

Answer 3

ActionEditor is still very limited in features, you are going to have to write some kind of code behind to allow for texture filtering. If you do not plan on scaling your sprites (Note I said sprite, not scene, these are two different behaviors), then I would not even worry about texture filtering, the time difference would be negligible.