我开发了一个示例 iPad 应用程序，在其中我在 UIWebView 中打开了一个 ppt 类型的文件。当我在操作系统版本为 5.0(iPad2) 和 4.3.1(iPad1) 的 iPad 上运行此应用程序时，应用程序崩溃并出现以下错误（内存警告）：
Apr 11 11:01:23 unknown WebViewTest[345] <Warning>: Received memory warning.
Apr 11 11:01:24 unknown UserEventAgent[12] <Notice>: jetsam: kernel termination snapshot being created
Apr 11 11:01:24 unknown com.apple.launchd[1] <Notice>: (UIKitApplication:com.apple.Preferences[0x3072]) Exited: Killed: 9
Apr 11 11:01:24 unknown com.apple.launchd[1] <Notice>: (UIKitApplication:com.extentia.DMG[0x6ba7]) Exited: Killed: 9
Apr 11 11:01:24 unknown SpringBoard[15] <Warning>: Application 'Settings' exited abnormally with signal 9: Killed: 9
Apr 11 11:01:24 unknown SpringBoard[15] <Warning>: Application 'DMG' exited abnormally with signal 9: Killed: 9
Apr 11 11:01:25 unknown ReportCrash[347] <Error>: Saved crashreport to /Library/Logs/CrashReporter/LowMemory-2012-04-11-110125.plist using uid: 0 gid: 0, synthetic_euid: 0 egid: 0
Apr 11 11:01:25 unknown WebViewTest[345] <Warning>: Received memory warning.
Apr 11 11:01:26 unknown SpringBoard[15] <Warning>: Received memory warning.
Apr 11 11:01:26 unknown com.apple.launchd[1] <Notice>: (UIKitApplication:com.extentia.WebViewTest[0x99f4]) Exited: Killed: 9
Apr 11 11:01:26 unknown UserEventAgent[12] <Notice>: jetsam: kernel termination snapshot being created
Apr 11 11:01:26 unknown SpringBoard[15] <Warning>: Application 'WebViewTest' exited abnormally with signal 9: Killed: 9
Apr 11 11:01:35 unknown ReportCrash[348] <Error>: Saved crashreport to /Library/Logs/CrashReporter/LowMemory-2012-04-11-110135.plist using uid: 0 gid: 0, synthetic_euid: 0 egid: 0
但是，当我在操作系统版本为 4.3.3（iPad2）的 iPad 上运行相同的应用程序时，它运行良好。这种奇怪行为背后的原因是什么以及解决此问题的任何解决方案。提前致谢。