why i got this error while moving object in spritekit - swift

Question

I am trying make a game something like Tower defense. I am adding units to my map and I want to try movepoint to another point.
My code is:
func setTheNode(position:[Int],speed:[Int]){
let moveDown1 = SKAction.moveToY(300, duration:4)
let moveRight1 = SKAction.moveToX(300, duration: 3)
let sequence = SKAction.sequence([moveDown1, moveRight1]);
self.runAction(sequence)
}
This works, however I want to read these position and durations from parameters.
When I try this way:
func setTheNode(position:[Int],speed:[Int]){
let moveDown1 = SKAction.moveToY(position[0], duration:speed[0])
let moveRight1 = SKAction.moveToY(position[1], duration:speed[1])
let sequence = SKAction.sequence([moveDown1, moveRight1]);
self.runAction(sequence)
}
I ger the error:
Cannot invoke 'moveToY' with an argument list of type '(Int, duration:
Int)'
I also tried
let moveDown1 = SKAction.moveToY(position[0] as? Int, duration:speed[0] as? Int)
And got the same error again. Could you help me on this?
Thank you.

Answer 1

SKAction.moveToY accept a CGFloat for Y and an NSTimeInterval for duration. Therefore you need to change position's type to [CGFloat] and speed's type to [NSTimeInterval].
There are a few other things I notice with your code:
1. I think it's a typo - you've written let moveRight1 = SKAction.moveToY in your second function. Should that be SKAction.moveToX?
2. You're using speed to represent time. That's going to give you some strange results because speed and time are inversely proportional. Therefore, with your implementation, if you increase speed it's going to take longer for your node to move...
I would recommend writing your function like so:
func setTheNode(deltaPosition dp: CGVector, times: (x: NSTimeInterval, y: NSTimeInterval)){
let moveDown1 = SKAction.moveToY(dp.dx, duration: times.x)
let moveRight1 = SKAction.moveToX(dp.dy, duration: times.y)
let sequence = SKAction.sequence([moveDown1, moveRight1]);
self.runAction(sequence)
}