Makpit Memory Leak - ios

Question

I tried a lot of solutions but even in actual device, memory consumption is very high. When secondview is dismissed first time, memory doesnot decrease like its increases. The memory usage after dismissing secondview depends on how much area user discovered in map.
Here is my code.
First view controller
import UIKit
import CoreLocation
class ViewController: UIViewController {
let manager = CLLocationManager()
private let currentColor = UIColor(red: 234/255.0, green: 128/255.0, blue: 16/255.0, alpha: 1.0)
override func viewDidLoad(){
super.viewDidLoad()
manager.requestWhenInUseAuthorization()
let button = buttonLoader(y: 7*self.view.frame.height/16, text: "trigger")
self.view.addSubview(button)
}
private func buttonLoader(y:CGFloat,text:String)->UIButton{
let Label = UIButton(frame: CGRect(x: 0, y: y , width: self.view.frame.width, height: self.view.frame.height/8))
Label.setTitle(text, for: .normal)
Label.addTarget(self, action: #selector(mapOpener), for: .touchUpInside)
Label.setTitleColor(currentColor, for: .normal)
self.view.addSubview(Label)
return Label
}
#objc func mapOpener(){
let newView = SecondViewController()
newView.view.backgroundColor = .white
self.present(newView, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
SecondViewController
import UIKit
import MapKit
class SecondViewController: UIViewController {
var map :MKMapView!
var saverButton : UIButton!
override func viewDidLoad() {
super.viewDidLoad()
saveButtonLoader()
mapLoader()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func mapLoader(){
map = MKMapView(frame: CGRect(x: 0, y: 64, width: view.frame.size.width, height: self.view.frame.size.height-64))
map.mapType = MKMapType.standard
map.isZoomEnabled = true
map.isScrollEnabled = true
map.showsUserLocation = true
map.userTrackingMode = .follow
view.addSubview(map)
}
func saveButtonLoader() {
saverButton = UIButton(frame: CGRect(x: 4*view.frame.size.width/5, y: 20, width: view.frame.size.width/5, height: 44))
saverButton.setTitle("Finish", for: .normal)
saverButton.addTarget(self, action: #selector(finishButtonAction), for: UIControlEvents.touchUpInside)
saverButton.backgroundColor = UIColor.blue
saverButton.isEnabled = true
self.view.addSubview(saverButton)
}
override func viewWillDisappear(_ animated:Bool){
super.viewWillDisappear(animated)
self.applyMapViewMemoryFix()
}
func applyMapViewMemoryFix(){
map.delegate = nil
removeOldAnnotations()
map.removeFromSuperview()
map = nil
}
func removeOldAnnotations(){
for annotation in map.annotations{
map.removeAnnotation(annotation)
}
}
#objc func finishButtonAction(sender:UIButton!) {
self.dismiss(animated: true, completion: {
})
}
}