xcode 每次加载视图时 MKMapView 使用大量内存
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MKMapView using a lot of memory each time i load its view
提问by Richie
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:
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，并且永远不会下降，所以每次我进入视图时它都会不断跳跃并最终变得超高。当我像这样离开控制器时，我尝试删除地图视图：
override func viewWillDisappear(animated: Bool) {
map.removeFromSuperview()
}
but it doesn't have any effect on the memory. The map views delegate is set to its view controller.
但它对内存没有任何影响。地图视图委托设置为其视图控制器。
I tried checking for leaks using Xcode instruments but didn't find anything.
我尝试使用 Xcode 工具检查泄漏，但没有找到任何东西。
Does anyone know how to fix this?
有谁知道如何解决这一问题？
Thanks
谢谢
EDIT: Adding this seems to work:
编辑：添加这个似乎有效：
func removeNastyMapMemory() {
map.mapType = MKMapType.Hybrid
map.delegate = nil
map.removeFromSuperview()
map = nil
}
override func viewWillDisappear(animated: Bool) {
removeNastyMapMemory()
}
采纳答案by Hemang
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.
这不是 Swift 问题，而是来自 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。
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.
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.
如果您多次（或多次）使用 Map，只需创建它的单个（共享）实例。您可以随时使用它。
或者，如果您只使用一次，请从这里尝试解决方案，https://stackoverflow.com/a/25419783/1603234。这可能会有所帮助。减少一点。但不是所有的。
