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I'm having a crash occur on a client's app and other than a lot at the WTFCrash, I'm not getting much use out of the stack trace.
I am using a WKWebView instance to show a web page that has some CSS based animations and a video. The issues occurs on iOS 8 and 9 over a wide variety of devices (iPhone 5c to a 6s and a similar range of iPads).
The WKWebView runs in its own process, not the application's. When the crash occurs a white layer is left behind that covers the main application, rendering it inaccessible even thought its process has not been affected.
Looking at the device logs I find crashes from the com.apple.WebKit.WebContent process and they all have the exact same log for the crashed thread.
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 JavaScriptCore 0x0000000184c9f22c WTFCrash + 72
1 JavaScriptCore 0x0000000184c9f224 WTFCrash + 64
2 WebKit 0x0000000188ecd850 WebKit::RemoteLayerTreeDrawingArea::acceleratedAnimationDidStart(unsigned long long, WTF::String const&, double) + 0
3 WebCore 0x0000000184f2e70c WebCore::ThreadTimers::sharedTimerFiredInternal() + 148
4 WebCore 0x0000000184f2e64c WebCore::timerFired(__CFRunLoopTimer*, void*) + 36
5 CoreFoundation 0x000000018107d81c __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
6 CoreFoundation 0x000000018107d4c0 __CFRunLoopDoTimer + 884
7 CoreFoundation 0x000000018107abd4 __CFRunLoopRun + 1520
8 CoreFoundation 0x0000000180fa4d10 CFRunLoopRunSpecific + 384
9 Foundation 0x00000001819b4d8c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 308
10 Foundation 0x0000000181a09ff8 -[NSRunLoop(NSRunLoop) run] + 88
11 libxpc.dylib 0x0000000180d68cf8 _xpc_objc_main + 660
12 libxpc.dylib 0x0000000180d6aa2c xpc_main + 200
13 com.apple.WebKit.WebContent 0x0000000100057924 0x100054000 + 14628
14 libdyld.dylib 0x0000000180b428b8 start + 4
Here is some sample html/css that we use to reproduce the issue.
var initialWidth = 100;
window.addEventListener('load', function() {
var div = document.getElementById('mytest');
div.className = '';
setInterval(function() {
initialWidth += 10;
if (initialWidth > 1000) {
initialWidth = 1;
}
div.style.height = initialWidth + 'px';
}, 40);
}, false); body {
background-color: #4cb9e4;
}
div#mytest {
position: absolute;
top: 0;
width: 100%;
height: 5000px;
background-color: rgba(0, 0, 0, 0.7);
text-align: center;
overflow-y: hidden;
-webkit-transition-property: height;
-moz-transition-property: height;
transition-property: height;
-webkit-transition-duration: 0.5s;
-moz-transition-duration: 0.5s;
transition-duration: 0.5s;
-webkit-transition-timing-function: ease;
-moz-transition-timing-function: ease;
transition-timing-function: ease;
}
div#mytest.hidden {
height: 0;
} <body>
<div class="hidden" id="mytest">
This is sample test
</div>
</body>Does this look familiar to anybody? Is there something I should tell the web engineer to change with regards to the animation?
844
WKWebView - This view allows developers to embed web content in your app. You can think of WKWebView as a stripped-down version of Safari. It is responsible to load a URL request and display the web content. WKWebView has the benefit of the Nitro JavaScript engine and offers more features.
A WKWebView object is a platform-native view that you use to incorporate web content seamlessly into your app's UI. A web view supports a full web-browsing experience, and presents HTML, CSS, and JavaScript content alongside your app's native views.
Loading local content WKWebView can load any HTML stored in your app bundle using its loadFileURL() method. You should provide this with a URL to some HTML file that you know is in your bundle, along with another URL that stores any other files you want to allow the web view to read. That url.
You should create the webView in the main thread
- (void)createWebView{
if (![NSThread isMainThread]) {
dispatch_async(dispatch_get_main_queue(), ^{
[self createWebView];
});
return;
}
self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];
//Rest of my code
}
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