Memory leak from programmatically set constraints? iOS swift

Question

I have built an app and discovered that there is a memory leak. When I segue from my home page view controller to any other view controller and then back to my homepage, the memory grows by a small amount each time. From everything I can tell, this is due to a problem with my home page view controller. In my ViewController class (the class for my home page) I set constraints programmatically to fit every iOS device. Could this be a cause of my memory leak? how could I clear these constraints once I segue to a new view controller? The code for my ViewController class (homepage) can be seen below.

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var GoButton: UIButton!

@IBOutlet weak var Background: UIImageView!

@IBOutlet weak var SettingsButton: UIButton!


@IBOutlet weak var aboutButton: UIButton!


@IBAction func toFlashcards(_ sender: Any) {

    self.Background.image = nil

}

override func viewDidLoad() {

    super.viewDidLoad()

}

override func viewWillLayoutSubviews() {
    if(view.frame.size.width == 375 || view.frame.size.width == 812)&&(view.frame.size.height == 375 || view.frame.size.height == 812){
        iphoneX()
    }
    if(view.frame.size.width == 320 || view.frame.size.width == 568)&&(view.frame.size.height == 320 || view.frame.size.height == 568){
        iphoneSE()
    }

    if(view.frame.size.width == 414 || view.frame.size.width == 736)&&(view.frame.size.height == 414 || view.frame.size.height == 736){
        iphone8Plus()
    }

    if(view.frame.size.width == 375 || view.frame.size.width == 667)&&(view.frame.size.height == 375 || view.frame.size.height == 667){
        iphone8()
    }

    if(view.frame.size.width == 1024 || view.frame.size.width == 1366)&&(view.frame.size.height == 1024 || view.frame.size.height == 1366){
        ipadPro()
    }

    if(view.frame.size.width == 1112 || view.frame.size.width == 834)&&(view.frame.size.height == 1112 || view.frame.size.height == 834){
        ipad10inch()
    }

    if(view.frame.size.width == 768 || view.frame.size.width == 1024)&&(view.frame.size.height == 768 || view.frame.size.height == 1024){
        ipad9inch()
    }
}
func iphoneX(){
    Background.contentMode = .scaleToFill
    Background.image = #imageLiteral(resourceName: "iphoneXBackground")


    GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 50)
    GoButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 220).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 150).isActive = true
    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 88).isActive = true


    SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
    view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 575).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 90).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 139).isActive = true


    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant: 34).isActive = true
    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 300).isActive = true
    aboutButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 280).isActive = true
}
func iphoneSE(){
    Background.contentMode = .scaleToFill
    Background.image = #imageLiteral(resourceName: "iphoneXBackground")
    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 75).isActive = true
    GoButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 195).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 95).isActive = true


   view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 400).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 60).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 120).isActive = true

    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant:40).isActive = true

    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 205).isActive = true
    aboutButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 245).isActive = true

    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 25)
GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 45)
SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 25)

}
func iphone8Plus(){
    Background.contentMode = .scaleToFill
    Background.image = #imageLiteral(resourceName: "iphoneXBackground")

    GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 50)
    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 94).isActive = true
    GoButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 245).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 130).isActive = true


    SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
    view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 525).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 75).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 157).isActive = true


    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 32)
    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant: 46).isActive = true
    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 267).isActive = true
    aboutButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 315).isActive = true

}
func iphone8(){
    Background.contentMode = .scaleToFill
    Background.image = #imageLiteral(resourceName: "iphoneXBackground")

    GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 50)
    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 85).isActive = true
    GoButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 215).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 112).isActive = true

    SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
    view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 465).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 65).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 139).isActive = true

    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant: 35).isActive = true
    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 239).isActive = true
    aboutButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 284).isActive = true
}
func ipadPro(){
    Background.contentMode = .scaleToFill
    GoButton.frame.size.width = 170
    GoButton.frame.size.height = 170
    GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 100)
    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 209).isActive = true
    view.trailingAnchor.constraint(equalTo: GoButton.trailingAnchor, constant: 961).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 200).isActive = true

    SettingsButton.frame.size.width = 220
    SettingsButton.frame.size.height = 147
    SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 60)
    view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 935).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 118).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 420).isActive = true

    aboutButton.frame.size.width = 222
    aboutButton.frame.size.height = 129
    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 60)
    view.trailingAnchor.constraint(equalTo: aboutButton.trailingAnchor, constant: 667).isActive = true
    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 445).isActive = true
    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant: 94).isActive = true
}
func ipad10inch(){
    Background.contentMode = .scaleToFill
    GoButton.frame.size.width = 220
    GoButton.frame.size.height = 110
    GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 82)

    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 174).isActive = true
    view.trailingAnchor.constraint(equalTo: GoButton.trailingAnchor, constant: 810).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 161).isActive = true

    SettingsButton.frame.size.width = 220
    SettingsButton.frame.size.height = 110
    SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 55)
    view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 737).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 92).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 335).isActive = true

    aboutButton.frame.size.width = 200
    aboutButton.frame.size.height = 108
    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 55)
    view.trailingAnchor.constraint(equalTo: aboutButton.trailingAnchor, constant: 515).isActive = true
    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 338).isActive = true
    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant: 80).isActive = true
}
func ipad9inch(){
    Background.contentMode = .scaleToFill

    GoButton.frame.size.width = 220
    GoButton.frame.size.height = 110
    GoButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 82)
    view.bottomAnchor.constraint(equalTo: GoButton.bottomAnchor, constant: 160).isActive = true
    view.trailingAnchor.constraint(equalTo: GoButton.trailingAnchor, constant: 738).isActive = true
    GoButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 155).isActive = true

    SettingsButton.frame.size.width = 220
    SettingsButton.frame.size.height = 110
    SettingsButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 55)
    view.trailingAnchor.constraint(equalTo: SettingsButton.trailingAnchor, constant: 700).isActive = true
    SettingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 85).isActive = true
    SettingsButton.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 305).isActive = true

    aboutButton.frame.size.width = 200
    aboutButton.frame.size.height = 108
    aboutButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 55)
    view.trailingAnchor.constraint(equalTo: aboutButton.trailingAnchor, constant: 495).isActive = true
    aboutButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 312).isActive = true
    view.bottomAnchor.constraint(equalTo: aboutButton.bottomAnchor, constant: 65).isActive = true
}

}