IOS应用程序因低内存而被杀死，但未收到内存警告 [英] IOS app killed for Low Memory but no Memory Warning received

问题描述

我现在已经遇到问题一段时间了，我想知道是否有人可以提供帮助。
我正在使用主导航控制器和大量UIImage开发IOS应用程序（iPad）。
使用应用程序一段时间后，应用程序因低内存而死（不是在特定视图中），但通过查看iPad日志，我并不总是看到内存不足警告（有时候我会这样做，有时候我不要）。
即使我收到一个，它只是收到的内存不足警告，但我从未得到 1级或 2级。

I'm stuck with a problem for some time now and I would like to know if anyone can help. I'm developing an IOS app (iPad) using a main navigation controller and a lot of UIImage. After using the application for a while, the app get killed for Low Memory (not in a particular View) but by checking the iPad log, I don't always see a Low Memory Warning (sometimes I do, sometimes I do not). Even when I receive one, it's just "Low Memory Warning received" but I never get "Level 1" or "Level 2".

通过使用xCode中的泄漏仪器，我找不到任何泄漏。

By using the Leak instrument from xCode, I couldn't find any leaks.

可以有人帮忙吗？

推荐答案

内存警告作为通知发送，因此它将在runloop上排队等待发送一旦机会出现。如果你要写一个（故意破坏）循环，如：

A memory warning is sent as a notification, so it'll be queued up on the runloop for dispatch as soon as an opportunity arises. If you were to write a (deliberately broken) loop like:

while(1)
{
    NSString *newString = [NSString string];
}

然后最终你的应用程序因内存不足而被杀，但没有机会它可以接收低内存警告。

Then eventually your app would be killed due to low memory but at no opportunity would it be in a position to receive a low memory warning.

如果由于内存不足而没有收到警告而被杀，那么你可能会造成内存瓶颈对于你自己的某个地方，可能你有某种循环，在自动释放池中留下了很多东西 - 所以，如果你完全通过循环，那么临时对象就会消失，因此没有长期的足迹，但是他们'在你保持循环的过程中重新累积。

If you're being killed due to low memory without receiving a warning then you've probably creating a memory bottleneck for yourself somewhere, likely you have some sort of loop that leaves a lot of things in the autorelease pool — so, if you get all the way through the loop then the temporary objects vanish and hence have no long-term footprint, but they're accumulating all the time you remain in the loop.

为了避免这种情况，你想看看在自己的<$ c $中嵌套循环的内部部分C> NSAutoreleasePool 秒。例如，这个循环：

To avoid that sort of situation you want to look at nesting inner parts of the loop in their own NSAutoreleasePools. For example, this loop:

while(1)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSString *newString = [NSString string];
    [pool drain]; // stylistically preferred to release, but equivalent
                  // in reference counted environments
}

将永远持续但不会触发低内存条件。

Will continue forever but won't ever trigger a low memory condition.

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