ios - 删除UIViewController的正确方法

我有一个settingsController，它是一个自定义UINavigationController，必须显示和消失。

它的XIB位于情节提要中，由于其他内部用途，我不得不使用var settingsController对其进行跟踪。

主视图控制器:

class MainViewController: UIViewController {

    var settingsController : MySettingsNavigationController?

    func settingsButtonPressed () {
        let storyboard = UIStoryboard(name: "Main Storyboard", bundle: nil)
        self.settingsController = storyboard.instantiateViewController(withIdentifier: "Settings Navigation Controller") as? MySettingsNavigationController
        self.settingsController!.transitioningDelegate = self
        self.settingsController!.modalPresentationStyle = .custom
        self.present(self.settingsController!, animated: true, completion: nil)
    }

    //Settings View Controller Transition Methods
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerView = transitionContext.containerView
        let fromViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from)
        let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
        if(self.isSettingsPresenting == true) {
            toViewController!.view.alpha = 1;
            toViewController!.view.transform = CGAffineTransform(scaleX: 0.001, y: 0.001);
            toViewController!.view.center = self.settingsButton.center

            UIView.animate(withDuration: 0.5, delay: 0,
                           options: [.curveEaseIn], animations: { () -> Void in

                toViewController!.view.alpha = 1;
                toViewController!.view.transform = CGAffineTransform(scaleX: 1, y: 1);
                toViewController!.view.center = fromViewController!.view.center
                containerView.addSubview(toViewController!.view)

            }, completion: { (completed) -> Void in

                transitionContext.completeTransition(completed)

            })

        } else {
            UIView.animate(withDuration: 0.5, delay: 0,
                           options: [.curveEaseOut], animations: { () -> Void in

                fromViewController!.view.alpha = 0;
                fromViewController!.view.transform = CGAffineTransform(scaleX: 0.01, y: 0.01);
                fromViewController!.view.center = self.settingsButton.center

            }, completion: { (completed) -> Void in
                //Two lines below added later to test..
                fromViewController?.view.removeFromSuperview()
                fromViewController?.removeFromParentViewController()
                transitionContext.completeTransition(completed)
            })
        }
    }
}

设置导航控制器:

class MySettingsNavigationController:  UINavigationController, UINavigationControllerDelegate
{
    .....

    func closeButtonPressed (_ sender: UIButton!) {
        self.dismiss(animated: true, completion: {
            //Tried removing self in here...
        })
    }
}

问题:

当我打开settingsController并关闭它时，settingsController分配的内存永远不会释放；不知何故，settingsController没有被释放。

注意:

我必须以某种方式:

从情节提要

启动视图控制器

使用自定义动画过渡

不要使用自定义委托(因为我无法将委托写入
已经是UINavigationControllerDelegate了。这本可以给
我有机会回给父母，MainViewController是
准备好删除了

最佳答案

不知何故，settingsController没有被释放

var settingsController看起来像是罪魁祸首。
强烈建议不要将ViewController作为var对象。

由于其他内部管理目的，我必须使用'var settingsController'来跟踪它。

利用sharedHelper-esque类进行评估，该类提供controller相关的属性数据或处理用户交互。

除settingsButtonPressed(仅应由其负责调用settingsController)外，没有其他函数应设计为需要执行settingsController的实例。此类功能所需的数据可以通过protocols，blocks，shared instances等多种方式提取。