didReceiveMemoryWarning

最新推荐文章于 2025-08-07 16:13:49 发布

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本文介绍当应用收到内存警告时，ViewController如何处理didReceiveMemoryWarning方法。默认实现会检查是否可以安全释放视图，若可以，则释放视图并调用viewDidUnload方法。开发者可根据需求重写此方法以释放更多内存。

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didReceiveMemoryWarning

Sent to the view controller when the application receives a memory warning.

- (void)didReceiveMemoryWarning

Discussion

The default implementation of this method checks to see if the view controller can safely release its view. This is possible if the view itself does not have a superview and can be reloaded either from a nib file or using a custom loadView method. If the view can be released, this method releases it and calls the viewDidUnload method.

You can override this method (as needed) to release any additional memory used by your view controller. If you do, be sure to call the super implementation at some point to allow the view controller to release its view. In iOS 3.0 and later, if your view controller holds references to objects in the view hierarchy, you should release those references in theviewDidUnload method instead. In earlier versions of iOS, you should continue to release them from this method. See the discussion in the viewDidUnload method for information about how to safely release outlets and other objects.