MKMapView每次加载其视图时都会占用大量内存 [英] MKMapView using a lot of memory each time i load its view

问题描述

我有一个非常简单的应用程序，有几个视图控制器。第二个视图控制器中有一个MKMapView。它设置正确，功能正常。问题是，每次我加载它的视图时，内存使用量会跳跃~30mb，并且永远不会回落，所以每次进入视图时它都会继续跳跃并最终变得超高。
当我离开控制器时，我尝试删除地图视图，如下所示：

I have a pretty simple app, with a couple of view controllers. There is a MKMapView in the second view controller. It is set up correctly, and functions fine. The problem is, each time I load its view the Memory usage jumps ~30mb, and never goes back down, so each time i go into the view it keeps jumping and eventually gets super high. I tried removing the map view when i leave the controller like this:

override func viewWillDisappear(animated: Bool) {
        map.removeFromSuperview()
    }

但它没有对记忆有任何影响。地图视图委托设置为其视图控制器。

but it doesn't have any effect on the memory. The map views delegate is set to its view controller.

我尝试使用Xcode仪器检查泄漏但没有找到任何东西。

I tried checking for leaks using Xcode instruments but didn't find anything.

有谁知道如何解决这个问题？

Does anyone know how to fix this?

谢谢

编辑：
添加此功能似乎有效：

Adding this seems to work:

func removeNastyMapMemory() {
        map.mapType = MKMapType.Hybrid
        map.delegate = nil
        map.removeFromSuperview()
        map = nil
    }

    override func viewWillDisappear(animated: Bool) {
        removeNastyMapMemory()
    }

推荐答案

这不是Swift问题，来自Objective-C时代。处理此问题的可能方法取决于应用程序的情况和行为。

This is not Swift issue, is coming from Objective-C days. The possible ways to handle this issue is depending upon the situation and behavior of the app.

1. 如果您正在使用地图多次（或多次），只创建一个（共享）实例。你可以随时使用它。

1. If you're using a Map for multiple times (or places), only create a single (shared) instance of it. Which you can use it whenever you want.

或者如果你只使用它一次，那么试试这里的解决方案，https://stackoverflow.com/a/25419783/1603234 。这可能有所帮助。减少一点。但不是全部。

Or If you're only using it for once, then try a solution from here, https://stackoverflow.com/a/25419783/1603234. This may help. Reduce little. But not all.

这篇关于MKMapView每次加载其视图时都会占用大量内存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！