iOS6 MKMapView 使用大量内存，以至于应用程序崩溃，还有人注意到这一点吗? [英] iOS6 MKMapView using a ton of memory, to the point of crashing the app, anyone else notice this?

问题描述

有没有其他人在他们的 iOS 6 应用中使用地图，注意到内存使用量非常高，以至于一遍又一遍地收到内存警告到应用崩溃?

Has anyone else, who's using maps in their iOS 6 apps, noticing extremely high memory use to the point of receiving memory warnings over and over to the point of crashing the app?

我已经通过仪器运行了该应用程序，我没有看到任何泄漏，并且在创建地图视图之前，该应用程序始终以大约 3mb 的实时字节运行.创建地图并下载切片后，Live Bytes 会跃升至 ~13mb Live Bytes.然后，当我四处移动地图并放大和缩小 Live Bytes 时，它会继续攀升，直到应用程序在大约 40mb Live Bytes 时崩溃.顺便说一下，这是在 iPhone 4 上.在 iPod touch 上，它崩溃得更早.

I've ran the app through instruments and I'm not seeing any leaks and until the map view is created the app consistently runs at around ~3mb Live Bytes. Once the map is created and the tiles are downloaded the Live Bytes jumps up to ~13mb Live Bytes. Then as I move the map around and zoom in and out the Live Bytes continuos to climb until the app crashes at around ~40mb Live Bytes. This is on an iPhone 4 by the way. On an iPod touch it crashes even earlier.

我正在正确地重用注释视图，没有任何泄漏.有没有其他人在新的 iOS 6 地图中看到同样高的内存使用率?另外，有没有人有解决办法?

I am reusing annotation views properly and nothing is leaking. Is anyone else seeing this same high memory usage with the new iOS 6 maps? Also, does anyone have a solution?

推荐答案

经过大量的尝试和测试不同的想法(这里提到了其中的一些)，最终对我有用的解决方案如下.

After a lot of playing around and testing different ideas, some of which were mentioned here, the final solution that worked for me was as follows.

• 我没有根据需要在应用程序中创建新的 MKMapView，而是向我的 AppDelegate 添加了一个 mkMapView 属性，并且仅在需要时创建它.一旦它被创建，它就会永远存在于 AppDelegate 中，我会在任何需要的地方重用该单个实例.这确实有助于减少使用的内存量，因为我之前实例化了几个不同的 MKMapView，并且它们都很快地消耗了内存.

• Instead of creating new MKMapView's as needed in the app, I added an mkMapView property to my AppDelegate and only created it when needed. Once it has been created, it lives in the AppDelegate forever and I reuse that single instance everywhere needed. This really helped in reducing the amount of memory being used as I was previously instantiating a couple different MKMapView's and both were burning through memory pretty quickly.

我还发现，一旦收到内存警告，iOS 6 Maps 就可以很好地处理释放内存.是的，它在缩放和平移时确实消耗了更多内存，但似乎对内存警告做出了适当的响应.

I also found that iOS 6 Maps handles releasing memory very well once a Memory Warning has been received. Yes, it does use up more memory while zooming and panning, but seems to be responding to Memory Warnings appropriately.

我必须做的最后一件事是减少我的整体初始内存占用.我注意到我的起步比我预期的要高得多，所以这也导致了我收到的与内存相关的崩溃.一旦我减少了初始占用空间，让 MKMapView 在内存警告期间处理释放它的内存，并确保我只有 1 个 MKMapView 实例可以在整个应用程序中重用，一切运行正常.

The last thing I had to do was work on reducing my overall initial memory footprint. I noticed I was starting off way higher than I expected so that was also contributing to the crashes I was receiving related to memory. Once I got the initial footprint down, let MKMapView handle releasing it's memory during Memory Warnings, and made sure I only had 1 instance of MKMapView that I could reuse throughout the app, everything is running fine.

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