ios - iPhone 任务切换器图像为黑色

Question

我继承了一个代码库，只是注意到当我关闭应用程序(点击主页按钮)然后尝试使用任务切换器(双击主页按钮)切换到该应用程序时，我的应用程序出现在任务切换器中全黑的图像，而不是我正在查看的最后一页的预期屏幕截图。

其他人也遇到过这种情况吗？有什么想法可能导致它吗？正如我所说，我继承了这个代码库，所以我对可能导致这种情况的原因感到茫然。

Matt弄清楚下面接受的答案中发生了什么，但我想我应该在此处添加一些日志，以防其他人遇到此情况:

// Logs showing a correct shutdown
Sep 26 16:48:14 iPod-touch iap2d[2096] <Warning>: process HTTPLeakTester is now running in the background
Sep 26 16:48:15 iPod-touch iap2d[2096] <Warning>: process HTTPLeakTester is now suspending

// Logs Showing my killed app's shutdown
Sep 26 16:47:19 iPod-touch iap2d[2096] <Warning>: process ***** is now running in the background
Sep 26 16:47:19 iPod-touch SpringBoard[42] <Warning>: BSXPCMessage received error for message: Connection interrupted
Sep 26 16:47:19 iPod-touch SpringBoard[42] <Warning>: Application 'UIKitApplication:*****[0x5d54]' exited voluntarily.
Sep 26 16:47:19 iPod-touch assertiond[56] <Error>: assertion failed: 12A365: assertiond + 62335 [032107D4-DB2B-36DD-AC98-6060D8C62F73]: 0x3
Sep 26 16:47:19 iPod-touch assertiond[56] <Warning>: pid_suspend failed for <BKNewProcess: 0x16614640; *****; pid: 2386>: Unknown error: -1, Unknown error: -1
Sep 26 16:47:19 iPod-touch Unknown[56] <Error>: 
Sep 26 16:47:19 iPod-touch assertiond[56] <Warning>: Could not set priority of <BKNewProcess: 0x16614640; *****; pid: 2386> to 2, priority: No such process
Sep 26 16:47:19 iPod-touch assertiond[56] <Warning>: Could not set priority of <BKNewProcess: 0x16614640; *****; pid: 2386> to 4096, priority: No such process
Sep 26 16:47:19 iPod-touch assertiond[56] <Error>: assertion failed: 12A365: assertiond + 62335 [032107D4-DB2B-36DD-AC98-6060D8C62F73]: 0x3
Sep 26 16:47:19 iPod-touch UserEventAgent[17] <Warning>: id=***** pid=2386, state=0
Sep 26 16:47:19 iPod-touch iap2d[2096] <Warning>: process ***** is now switching to other state
Sep 26 16:47:19 iPod-touch iap2d[2096] <Warning>: process ***** is now terminated

Answer 1

我猜测该应用程序内存管理不善(或者可能在后台时试图做其他错误的事情，例如长时间使用大量 CPU)。毕竟，你继承了它，所以你不知道，这不是你的错。结果是，当我们进入后台时，看门狗进程发现该应用程序表现不佳并立即将其杀死。

如果您使用应用程序切换器进入后台，切换到黑色快照并启动，然后应用程序是否从头启动，您可以确认这一点。这证明它在后台被终止了。

如果这个猜测是正确的，那么当应用成为更好的公民时，问题应该就会消失。