在实例化新视图控制器时从内存中删除视图控制器 [英] Removing a view controller from memory when instantiating a new view controller

问题描述

在我的应用程序中，我实例化新的视图控制器而不是使用segues，因为它在动画中看起来更好，因此我的视图在后台继续运行。这会导致大量内存泄漏。

In my app, I am instantiating new view controllers instead of using segues because it looks better in animations as a result, my views keep running in the background. This causes large memory leaks.

我回到主屏幕的代码是：

My code to go back to the main screen is:

let mainStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
        let vc  : UIViewController = mainStoryboard.instantiateViewControllerWithIdentifier("MainScreen") as UIViewController
        self.presentViewController(vc, animated: false, completion: nil)

此视图控制器在后台仍处于活动状态因此不应再次实例化。我该怎么做。

This view controller is still active in the background and therefore shouldn't be instantiated again. How do I do this.

当我使用上面的代码关闭我的视图控制器时，它也不会卸载它，它会一直在后台运行。如何在屏幕消失后立即卸载。

When I close my view controller using the above code, it also does not unload it, it keeps running in the background. How do I make it unload as soon as the screen disappears.

我试过了

override func viewDidDisappear(animated: Bool) {
    super.viewDidDisappear(animated)
    view.removeFromSuperview()
    view = nil
}

但是这不能正常工作。以这种方式退出视图控制器时，如何从内存中正确销毁视图控制器。

However this does not work properly. How do I properly destroy a view controller from memory when exiting a view controller in this manner.

推荐答案

您只需要使用：

self.dismissViewControllerAnimated(true, completion: {})

其余工作是通过 ARC

为了在调试过程中为您提供帮助，您还可以添加以下代码：

To help you during your debug you can add also this code:

if let app = UIApplication.sharedApplication().delegate as? AppDelegate, let window = app.window {
   if let viewControllers = window.rootViewController?.childViewControllers {
      for viewController in viewController
          print(viewController.debugDescription)
      }
   }
}

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