iOS Swift SpriteKit-如何检测用户触摸小精灵之间的时间

Question

I have set up a match-3 game, and I want to track the number of seconds a user takes to touch valid points (game piece sprites) on the game board:
(1) when a game level is loaded, if the user does not touch a sprite within 5 seconds, track this;
(2) while playing the game, if the time elapsed between the user touching a sprite is greater than 5 seconds, track this.
(I will use these results to provide a hint to the user).
I would like to use a NSTimer/NSTimeInterval for this, but not sure how to implement it.

Answer 1

I wouldn't suggest adding an integer as others suggested.

All you need is delta time. I'm assuming you have that part worked out, but I'll post it just in case

scene properties

// time values
var delta:NSTimeInterval = NSTimeInterval(0)
var last_update_time:NSTimeInterval = NSTimeInterval(0)

your scene's update method (also create an update method for your sprites, and pass delta into it here)

 func update(currentTime: NSTimeInterval) {
        if self.last_update_time == 0.0 {
            self.delta = 0
        } else {
            self.delta = currentTime - self.last_update_time
        }

        self.yourSprite.update(self.delta)

your sprite's time properties

var timeSinceTouched = NSTimeInterval(0)
let timeLimit = NSTimeInterval(5.0)

your sprites update / touched method

func touched(){
    self.timeSinceTouched = 0.0
}

func update(delta: CFTimeInterval) {

    if self.timeSinceTouched < self.timeLimit {
        self.timeSinceTouched += delta
    } else {
        // five seconds has elapsed
    }