SpriteKit: A gap between SKSpriteNodes - ios

Question

When the blue square falls down on the red one a gap will remain. But when I make the blue square fall from a lower position there is no gap. Also when I give the blue square a higher mass the gap (on the ground) under the red square disappears and when the mass is too high the red square is gone.
I also made the squares smaller because the amount of pixels didn't equal the pixels of the png file which led to an even bigger gap. And when I set "showsPhysics" to true there is also a gap to see and even bigger when the squares are not scaled down.
Gap between SKSpriteNodes (picture)
//: Playground - noun: a place where people can play
import UIKit
import SpriteKit
import PlaygroundSupport
class Scene: SKScene {
var square = SKSpriteNode(texture: SKTexture(imageNamed: "red"), size: SKTexture(imageNamed: "red").size())
var square2 = SKSpriteNode(texture: SKTexture(imageNamed: "blue"), size: SKTexture(imageNamed: "blue").size())
var label = SKLabelNode(fontNamed: "Chalkduster")
override func didMove(to view: SKView) {
self.addChild(square)
self.addChild(square2)
self.addChild(label)
}
override func didChangeSize(_ oldSize: CGSize) {
// Add Scene Physics
self.physicsBody?.usesPreciseCollisionDetection = true
self.physicsBody = SKPhysicsBody(edgeLoopFrom: CGRect(x: -1, y: -1, width: self.size.width + 2, height: self.size.height + 2))
self.backgroundColor = UIColor.white
self.physicsBody?.usesPreciseCollisionDetection = true
//Add square
square.texture?.usesMipmaps = true
square.zPosition = 11
square.physicsBody = SKPhysicsBody(rectangleOf: square.size)
square.physicsBody?.usesPreciseCollisionDetection = true
square.physicsBody?.mass = 0.1
square.physicsBody?.allowsRotation = false
square.physicsBody?.usesPreciseCollisionDetection = true
square.setScale(0.25)
square.position = CGPoint(x: self.frame.width / 2, y: self.square.size.height)
square.name = "square"
//Add square2
square2.texture?.usesMipmaps = true
square2.zPosition = 11
square2.physicsBody = SKPhysicsBody(rectangleOf: square2.size)
square2.physicsBody?.usesPreciseCollisionDetection = true
square2.physicsBody?.mass = 0.1
square2.physicsBody?.allowsRotation = false
square2.physicsBody?.usesPreciseCollisionDetection = true
square2.setScale(0.25)
square2.position = CGPoint(x: self.frame.width / 2, y: self.square.size.height * 6)
square2.name = "square2"
//Add label
label.fontSize = 30
label.text = "w: \(self.frame.size.width) h: \(self.frame.size.height)"
label.position = CGPoint(x: self.frame.size.width / 2, y: self.frame.size.height - 30)
label.fontColor = UIColor.black
label.zPosition = 100
}
}
class ViewController: UIViewController {
let scene = Scene()
var viewSize = CGSize(width: 0, height: 0)
override func loadView() {
self.view = SKView()
}
override func viewDidLoad() {
super.viewDidLoad()
if let view = self.view as! SKView? {
view.frame = CGRect(origin: CGPoint(x: -1, y: -1), size: viewSize)
view.presentScene(scene)
view.showsPhysics = false
view.showsFPS = true
view.showsNodeCount = true
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
scene.size = CGSize(width: self.view.frame.size.width, height: self.view.frame.size.height)
}
}
PlaygroundPage.current.liveView = ViewController()

Answer 1

As proof from the print commands, there is no actual gap between the sprite nodes, and with second proof from a super-zoomed-in-screenshot:
The playground you provided does not replicate an issue, which makes me wonder... what is going on with your project?
pg #2:

Answer 2

The scene's width and height has to be multiplied by 2. So the scene has to be 4 times bigger than the ViewControllers view. It's also like that in the game template that Apple provides for Spritekit.
scene.size = CGSize(width: self.view.frame.size.width * 2, height: self.view.frame.size.height * 2)
https://github.com/simon2204/Playground