Free `self` in Swift

ViewController.swift

final class TabBarController: UITabBarController {
  override func viewDidLoad() {
    super.viewDidLoad()
  
    // Copy the reference `self` into a variable.
    var selfCopy = self
    
    // Implicitly cast `selfCopy` to a UnsafeMutableRawPointer.
    let ptr = UnsafeMutableRawPointer(&selfCopy)
    // Set it free!
    free(ptr)
    
    // Here's another way...
    withUnsafeMutablePointer(to: &selfCopy) { ptr in
      free(ptr)
    }
  }
}