UIWebView iOS 5：WebKit/JavaScriptCore崩溃

Question

我试图在我的iPad应用程序中包含基于UIWebView的浏览器。这需要一些时间，这使得它很难调试，但应用程序最终崩溃，始终在同一个位置：WebCore，在JavaScriptCore WTF::StringImpl::hash()函数上。它生产EXC_BAD_ACCESS (SIGSEGV), KERN_INVALID_ADDRESS at 0x00000001。

UIWebView位于由另一视图控制器（容器）以堆栈状方式管理的视图控制器中。我只在内存中保留四个或更少的浏览器。

任何关于崩溃日志，或关于什么可能导致崩溃？

这是网线的崩溃日志：

Thread 2 name: WebThread 
Thread 2 Crashed: 
0 JavaScriptCore     0x32a97d46 WTF::StringImpl::hash() const + 42 
1 JavaScriptCore     0x32a97c6a WTF::HashTable<WTF::StringImpl*, WTF::StringImpl*, WTF::IdentityExtractor<WTF::StringImpl*>, WTF::StringHash, WTF::HashTraits<WTF::StringImpl*>, WTF::HashTraits<WTF::StringImpl*> >::lookupForWriting(WTF::StringImpl* const&) + 18 
2 JavaScriptCore     0x32a9b028 std::pair<WTF::HashTableIterator<WTF::StringImpl*, WTF::StringImpl*, WTF::IdentityExtractor<WTF::StringImpl*>, WTF::StringHash, WTF::HashTraits<WTF::StringImpl*>, WTF::HashTraits<WTF::StringImpl*> >, bool> WTF::HashTable<WTF::StringImpl*, WTF::StringImpl*, WTF::IdentityExtractor<WTF::StringImpl*>, WTF::StringHash, WTF::HashTraits<WTF::StringImpl*>, WTF::HashTraits<WTF::StringImpl*> >::add<WTF::StringImpl*, WTF::StringImpl*, WTF::IdentityHashTranslator<WTF::StringImpl*, WTF::StringImpl*, WTF::StringHash> >(WTF::StringImpl* const&, WTF::StringImpl* const&) + 448 
3 JavaScriptCore     0x32a9ae30 WTF::AtomicString::addSlowCase(WTF::StringImpl*) + 96 
4 WebCore       0x31bade0c WebCore::AtomicHTMLToken::initializeAttributes(WTF::Vector<WebCore::HTMLToken::Attribute, 10ul> const&) + 232 
5 WebCore       0x31b88076 WebCore::AtomicHTMLToken::AtomicHTMLToken(WebCore::HTMLToken&) + 302 
6 WebCore       0x31b87eae WebCore::HTMLTreeBuilder::constructTreeFromToken(WebCore::HTMLToken&) + 14 
7 WebCore       0x31b7d07e WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) + 150 
8 WebCore       0x31bee29a WebCore::HTMLDocumentParser::resumeParsingAfterScriptExecution() + 50 
9 WebCore       0x31bc87e6 WebCore::HTMLDocumentParser::notifyFinished(WebCore::CachedResource*) + 78 
10 WebCore       0x31bc7448 WebCore::CachedResource::checkNotify() + 40 
11 WebCore       0x31bc7308 WebCore::CachedScript::data(WTF::PassRefPtr<WebCore::SharedBuffer>, bool) + 84 
12 WebCore       0x31bc7240 WebCore::CachedResourceRequest::didFinishLoading(WebCore::SubresourceLoader*, double) + 120 
13 WebCore       0x31bc715e WebCore::SubresourceLoader::didFinishLoading(double) + 158 
14 WebCore       0x31bc58c2 _ZN7WebCoreL16didFinishLoadingEP16_CFURLConnectionPKv + 46 
15 CFNetwork      0x347737ee URLConnectionClient::_clientDidFinishLoading(URLConnectionClient::ClientConnectionEventQueue*) + 186 
16 CFNetwork      0x3476849e URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long) + 418 
17 CFNetwork      0x3476819c URLConnectionClient::processEvents() + 100 
18 CFNetwork      0x347680d2 MultiplexerSource::perform() + 150 
19 CoreFoundation     0x313d2acc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8 
20 CoreFoundation     0x313d2298 __CFRunLoopDoSources0 + 208 
21 CoreFoundation     0x313d103e __CFRunLoopRun + 646 
22 CoreFoundation     0x3135449e CFRunLoopRunSpecific + 294 
23 CoreFoundation     0x31354366 CFRunLoopRunInMode + 98 
24 WebCore       0x31b74c9c _ZL12RunWebThreadPv + 396 
25 libsystem_c.dylib    0x33bca72e _pthread_start + 314 
26 libsystem_c.dylib    0x33bca5e8 thread_start + 0 

Answer 1

至于崩溃日志表明，它看起来像它可能是一个JavaScript相关的问题。我假设你正在加载的页面上有JavaScript？出于兴趣，移动Safari浏览器的网页运行良好吗？它只是在UIWebView中出现问题吗？

如果您无法修改JS，或者网页似乎在其他移动/桌面浏览器或设备上运行良好，我会建议您提交一份Apple问题以及用于重现该问题的JavaScript。

Answer 2

我有同样的问题，花了一整天的时间......有很多像这些不同的WebKit错误。最后，我明白了：这是一个多线程问题！我从线程1创建了WebView，然后尝试通过线程2中的JS函数修改其内容...

修复了简单的performSelectorOnMainThread:withObject:waitUntilDone:问题！

也许这会帮助别人。