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arraysswiftsprite-kitskaction

Swift trying to cross check array of SKActions with array of strings

Hi I'm trying to pick an SKAction from an array of SKAction's by using a string.

I have an array with all my game's possible SKActions in it. I then need to pull out the particular actions that match a selected node's possible action names (strings).

So, for example, I might have 

allActions = [runCentre, runLeft, runRight]

whereby those are SKActions, and

possibleActions = [runCentre, runRight]

which are strings accessed from a property list relating to the given node type.

How do I query the allActions array for the values in possibleActions? I know the mechanics of iterating through both arrays but not what I would actually try to access. Can I give the SKActions a string property somehow? I tried 

runStraight.setValue("runStraight", forKey: "name")

but that throws up NSUnknownKeyException. Is there a better way to do this?

Any help would be very much appreciated!

Solution

  • I really don't understand very well what do you want to achieve. Unfortunately a SKAction don't have a tag or name property as identification. You can create a dictionary to associate a string key to a SKAction

    Suppose you have these actions:

    let runCentre = SKAction.move(to: CGPoint(x:100.0,y:100.0), duration: 1.0)
let runLeft = SKAction.move(to: CGPoint(x:0.0,y:100.0), duration: 1.0)
let runRight = SKAction.move(to: CGPoint(x:200.0,y:100.0), duration: 1.0)
let runTop = SKAction.move(to: CGPoint(x:100.0,y:200.0), duration: 1.0)
let runBottom = SKAction.move(to: CGPoint(x:100.0,y:0.0), duration: 1.0)
// create a dictionary (key:string, value:SKAction)
let allActions = ["runCentre":runCentre,"runLeft":runLeft,"runRight": runRight,"runTop":runTop,"runBottom":runBottom]

    You can build a dictionary with:

    let allActions = ["runCentre":runCentre,"runLeft":runLeft,"runRight": runRight,"runTop":runTop,"runBottom":runBottom]

    Now suppose you have a node with these possible actions:

    let runDiag = SKAction.move(to: CGPoint(x:0.0,y:200.0), duration: 1.0)
let possibleActions = ["runCentre":runCentre, "runRight": runRight, "runDiag":runDiag]

    To know what possibleActions are available in allActions (relying on equal keys) you could do:

    let availableActions = allActions.filter { possibleActions.keys.contains($0.key) }