Activate/deactivate code - ios

Question

Trying to get the code so when if whiteDotDist < centerRadius - whiteDotRadius is executed all the code below it is active, and when the code below it is executed it becomes inactive again until the if whiteDotDist < centerRadius - whiteDotRadius is executed again. Sort of like a loop, so you have to keep going back and fourth from center to smallDot. Hard to explain over computer. Update it is giving me error 'Binary operator '<' cannot be applied to operands of type 'CGFloat' and 'Double'
#IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
if let view = recognizer.view {
view.center = CGPoint(x:view.center.x + translation.x,
y:view.center.y + translation.y)
}
recognizer.setTranslation(CGPoint.zero, in: self.view)
let centerRadius = 37.5
let whiteDotRadius = 23.5
let whiteDotDist = hypot(center.center.x - whiteDot.center.x, center.center.y - whiteDot.center.y - whiteDot.center.y)
if whiteDotDist < centerRadius - whiteDotRadius {
resetTimer() }
if (whiteDot.frame.contains(smallDot.frame) && smallDot.image != nil) {
addOne += 1
score.text = "\(addOne)"
resetTimer()
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(SecondViewController.startTimer), userInfo: nil, repeats: true)
smallDot.center = spawnRandomPosition()
}
}
}

Answer 1

Check to make sure:
All of the views have the same parent (so that they are all in the same coordinate system)
The Frames are tight around the circles. Change the background color of center, whiteDot, and smallDot to Red and post a picture
Even if you do that, your code checks if the bounding rects are inside each other, so it may look like the smallDot is outside the whiteDot (if it were in the corner), but the bounding frame is enclosed by whiteDot's frame.
If you want to check that the circles (not bounding boxes) are inside each other, get the distance between centers and make sure that that is within the (outer radius - smaller dot radius).
pseudo-code
let centerRadius = 100 // set this to radius of center circle
let whiteDotRadius = 10 // set this to whiteDot radius
let whiteDotDist = hypotf(center.center.x - whiteDot.center.x, center.center.y - whiteDot.center.y)
if whiteDotDist < centerRadius - whiteDotRadius {
// whiteDot is inside center
}