Example Of Retain Cycle On Delegate

retainCycle2.swift

class ParentViewController: UIViewController, ChildViewControllerProtocol {
    let childViewController = ChildViewController()
    
    func prepareChildViewController() {
        childViewController.delegate = self  // ❌ Strong reference, retain cycle
    }
}
 
protocol ChildViewControllerProtocol: class {}
 
class ChildViewController: UIViewController {
    var delegate: ChildViewControllerProtocol?
}