Prevent dragged object from leaving view its assigned to - ios

Question

I'm trying to write a piece of code in iOS using swift that creates a square where the user touches and lets them drag it around. The catch is I want the area it can move around in to be confined to the UIView it was created it.
The code below almost works. You can only create the square by pressing within the box, but then you can just drag it where you want. I'm not picky about if the box stays in the "fence" and tracks with your finger or just disappears until you move your finger back in, but I can't have it all over the screen.
I'm pretty new to this, so if there's a better way to go about it, I'm happy to be corrected.
class ViewController: UIViewController {
var dragableSquare = UIView() // a square that will appear on press and be dragged around
var fence = UIView() // a view that the square should be confined within
override func viewDidLoad() {
super.viewDidLoad()
// define the fence UIView and it to view
fence.frame = CGRectMake(view.frame.width/2 - 100, view.frame.height/2 - 100, 200, 200)
fence.backgroundColor = UIColor.grayColor()
view.addSubview(fence)
// give the fence a gesture recognizer
var pressRecog = UILongPressGestureRecognizer(target: self, action: "longPress:")
pressRecog.minimumPressDuration = 0.001
fence.addGestureRecognizer(pressRecog)
}
func longPress(gesture: UILongPressGestureRecognizer) {
print("press!")
// get location of the press
var touchPoint = gesture.locationInView(fence)
// When the touch begins place the square at that point
if gesture.state == UIGestureRecognizerState.Began {
print("began")
// create and add square to fence view
dragableSquare.frame = CGRectMake(touchPoint.x-5, touchPoint.y-5, 10, 10)
dragableSquare.backgroundColor = UIColor.blueColor()
self.fence.addSubview(dragableSquare)
// While the press continues, update the square's location to the current touch point
} else {
print("moving")
dragableSquare.center = touchPoint
}
}
I just joined stack overflow and I've been really impressed with how generous and helpful the community is. I hope I'll get enough experience to start helping others out soon too.

Answer 1

You can use CGRectIntersection to get the size of the intersection rectangle between to views. In your case, you want to keep moving the square as long as the intersection rectangle between the square and the fence is the same size as the square (meaning the square is still wholly within the fence). So your else clause should look like this,
} else {
print("moving")
if CGRectIntersection(dragableSquare.frame, fence.bounds).size == dragableSquare.frame.size {
dragableSquare.center = touchPoint
}
}