How to properly calculate 1 second with deltaTime in Swift

Question

I'm trying to calculate an elapsed second in deltaTime but I'm not sure how to do it, because my deltaTime constantly prints 0.0166 or 0.0167.

Here is my code:

override func update(_ currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */

    deltaTime = currentTime - lastTime
    lastTime = currentTime

How do I make it so I can squeeze some logic in here to run every second?

EDIT: I was able to come up with the following, but is there a better way?

            deltaTimeTemp += deltaTime
            if (deltaTimeTemp >= 1.0) {
                print(deltaTimeTemp)
                deltaTimeTemp = 0
            }

Answer 1

I always use SKActions for this type of thing: (written in swift 3)

let wait = SKAction.wait(forDuration: 1.0)
let spawnSomething = SKAction.run {
   //code to spawn whatever you need
}

let repeatSpawnAction = SKAction.repeatForever(SKAction.sequence([wait, spawnSomething]))

self.run(repeatSpawnAction)