ios - 以编程方式设置的约束导致内存泄漏？iOS 迅捷

Question

我已经构建了一个应用程序并发现存在内存泄漏。当我从我的主页视图控制器切换到任何其他视图控制器然后回到我的主页时，内存每次都会少量增长。据我所知，这是由于我的主页视图控制器存在问题。在我的 ViewController 类（我的主页的类）中，我以编程方式设置约束以适应每个 iOS 设备。这可能是我的内存泄漏的原因吗？一旦我选择一个新的视图控制器，我怎么能清除这些约束？我的 ViewController 类（主页）的代码如下所示。

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
}

}

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