我正在开发一个使用 html5、css3 和 jquery 作为应用程序的 Web 应用程序。我们通过 XCODE 运行 Web 文件并使用 XCODE 将“应用程序”上传到 iPad。
最近，在启动画面旋转几秒钟后，我们收到了内存警告和崩溃。
这些应用程序在 XCODE 模拟器中运行良好，我们注意到当应用程序有视频文件（即使是像 800KB 这样的小文件）时似乎会发生这种情况。
这是在 iPad 上运行应用程序的控制台。
我们如何防止这种崩溃？
8 月 15 日 11:50:12 BD-Graphics-Lab-6-iPad3 BD 按钮 [4020]：多任务 -> 设备：是，应用程序：是 8 月 15 日 11:50:12 BD-Graphics-Lab-6- iPad3内核[0]：launchd[4020]内置配置文件：容器（沙盒）
8 月 15 日 11:50:12 BD-Graphics-Lab-6-iPad3 内核[0]：launchd[4020] 容器：/private/var/mobile/Applications/997C5F22-C5A6-4A05-96C8-8ABEA9DAAC8A（沙盒）
8 月 15 日 11:50:12 BD-Graphics-Lab-6-iPad3 BD 按钮 [4020]：由于页面加载而重置插件。
8 月 15 日 11:50:15 BD-Graphics-Lab-6-iPad3 BD 按钮 [4020]：收到内存警告。
8 月 15 日 11:50:17 BD-Graphics-Lab-6-iPad3 UserEventAgent[13]：jetsam：正在创建内核终止快照
8 月 15 日 11:50:17 BD-Graphics-Lab-6-iPad3 com.apple.launchd 1 (UIKitApplication:com.bd.Push.us.y[0x4721][4020]) : (UIKitApplication:com.bd.Push .us.y[0x4721]) 退出：杀死：9
8 月 15 日 11:50:17 BD-Graphics-Lab-6-iPad3 backboardd[26]：应用程序 'UIKitApplication:com.bd.Push.us.y[0x4721]' 异常退出，信号 9：被杀死：9
8 月 15 日 11:50:17 BD-Graphics-Lab-6-iPad3 ReportCrash[4021]：libMobileGestalt copySystemVersionDictionaryValue：无法从系统版本字典中查找 ReleaseType
8 月 15 日 11:50:17 BD-Graphics-Lab-6-iPad3 ReportCrash[4021]：使用 uid:0 gid:0 将 crashreport 保存到 /Library/Logs/CrashReporter/LowMemory-2013-08-15-115017.plist，合成euid：0 egid：0
AppDelegate.m
@implementation AppDelegate
@synthesize window, viewController;
- (id)init
{
/** If you need to do any extra app-specific initialization, you can do it here
* -jm
**/
NSHTTPCookieStorage* cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
[cookieStorage setCookieAcceptPolicy:NSHTTPCookieAcceptPolicyAlways];
int cacheSizeMemory = 8 * 1024 * 1024; // 8MB
int cacheSizeDisk = 32 * 1024 * 1024; // 32MB
#if __has_feature(objc_arc)
NSURLCache* sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"];
#else
NSURLCache* sharedCache = [[[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"] autorelease];
#endif
[NSURLCache setSharedURLCache:sharedCache];
self = [super init];
return self;
}
#pragma mark UIApplicationDelegate implementation
/**
* This is main kick off after the app inits, the views and Settings are setup here. (preferred - iOS4 and up)
*/
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
int cacheSizeMemory = 16*1024*1024; // 16MB
int cacheSizeDisk = 32*1024*1024; // 32MB
NSURLCache *sharedCache = [[[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"] autorelease];
[NSURLCache setSharedURLCache:sharedCache];
CGRect screenBounds = [[UIScreen mainScreen] bounds];
#if __has_feature(objc_arc)
self.window = [[UIWindow alloc] initWithFrame:screenBounds];
#else
self.window = [[[UIWindow alloc] initWithFrame:screenBounds] autorelease];
#endif
self.window.autoresizesSubviews = YES;
#if __has_feature(objc_arc)
self.viewController = [[MainViewController alloc] init];
#else
self.viewController = [[[MainViewController alloc] init] autorelease];
#endif
self.viewController.useSplashScreen = YES;
// Set your app's start page by setting the <content src='foo.html' /> tag in config.xml.
// If necessary, uncomment the line below to override it.
// self.viewController.startPage = @"index.html";
// NOTE: To customize the view's frame size (which defaults to full screen), override
// [self.viewController viewWillAppear:] in your view controller.
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
// this happens while we are running ( in the background, or from within our own app )
// only valid if flush.ca.mbp-Info.plist specifies a protocol to handle
- (BOOL)application:(UIApplication*)application handleOpenURL:(NSURL*)url
{
if (!url) {
return NO;
}
// calls into javascript global function 'handleOpenURL'
NSString* jsString = [NSString stringWithFormat:@"handleOpenURL(\"%@\");", url];
[self.viewController.webView stringByEvaluatingJavaScriptFromString:jsString];
// all plugins will get the notification, and their handlers will be called
[[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:CDVPluginHandleOpenURLNotification object:url]];
return YES;
}
// repost the localnotification using the default NSNotificationCenter so multiple plugins may respond
- (void) application:(UIApplication*)application
didReceiveLocalNotification:(UILocalNotification*)notification
{
// re-post ( broadcast )
[[NSNotificationCenter defaultCenter] postNotificationName:CDVLocalNotification object:notification];
}
- (NSUInteger)application:(UIApplication*)application supportedInterfaceOrientationsForWindow:(UIWindow*)window
{
// iPhone doesn't support upside down by default, while the iPad does. Override to allow all orientations always, and let the root view controller decide what's allowed (the supported orientations mask gets intersected).
NSUInteger supportedInterfaceOrientations = (1 << UIInterfaceOrientationPortrait) | (1 << UIInterfaceOrientationLandscapeLeft) | (1 << UIInterfaceOrientationLandscapeRight) | (1 << UIInterfaceOrientationPortraitUpsideDown);
return supportedInterfaceOrientations;
}
- (void)applicationDidReceiveMemoryWarning:(UIApplication*)application
{
[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSLog(@"Cache Cleared");
}
CDVViewController.m
- (void)didReceiveMemoryWarning
{
// iterate through all the plugin objects, and call hasPendingOperation
// if at least one has a pending operation, we don't call [super didReceiveMemoryWarning]
NSEnumerator* enumerator = [self.pluginObjects objectEnumerator];
CDVPlugin* plugin;
BOOL doPurge = YES;
while ((plugin = [enumerator nextObject])) {
if (plugin.hasPendingOperation) {
NSLog(@"Plugin '%@' has a pending operation, memory purge is delayed for didReceiveMemoryWarning.", NSStringFromClass([plugin class]));
doPurge = NO;
}
}
if (doPurge) {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
}
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload
{
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.webView.delegate = nil;
self.webView = nil;
[CDVUserAgentUtil releaseLock:&_userAgentLockToken];
}
#pragma mark UIWebViewDelegate
/**
When web application loads Add stuff to the DOM, mainly the user-defined settings from the Settings.plist file, and
the device's data such as device ID, platform version, etc.
*/
- (void)webViewDidStartLoad:(UIWebView*)theWebView
{
NSLog(@"Resetting plugins due to page load.");
[_commandQueue resetRequestId];
[[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:CDVPluginResetNotification object:self.webView]];
}
/**
Called when the webview finishes loading. This stops the activity view.
*/
- (void)webViewDidFinishLoad:(UIWebView*)theWebView
{
NSLog(@"Finished load of: %@", theWebView.request.URL);
// It's safe to release the lock even if this is just a sub-frame that's finished loading.
[CDVUserAgentUtil releaseLock:&_userAgentLockToken];
/*
* Hide the Top Activity THROBBER in the Battery Bar
*/
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
[self processOpenUrl];
[[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:CDVPageDidLoadNotification object:self.webView]];
}
