UIWebView memory leak when loaded from file instead of url?
I have a UIViewController that contains a UIWebView (OS 3.0). If I load it with the file data as soon as the back button is clicked and the view is rejected, I see an EXEC_BAD_ACCESS
error with the WebCore release: "SharedBuffer"
- (void)viewDidLoad {
NSString *htmlFile = [[NSBundle mainBundle] pathForResource:fileName ofType:@"html"];
NSData *fileHtmlData = [NSData dataWithContentsOfFile:htmlFile];
[webView loadData:fileHtmlData MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:[NSURL URLWithString:@""]];
}
If I change the above to download on demand, everything works fine.
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
In my controller dealloc, I release the webview with the following:
[webView setDelegate:nil];
[webView release];
The stack trace is below:
#2 0x359d34ae in WebCore::SharedBuffer::~SharedBuffer
#3 0x358fdab8 in WebCore::DocumentLoader::~DocumentLoader
#4 0x332d3c00 in WebDocumentLoaderMac::~WebDocumentLoaderMac
#5 0x358fec8c in WebCore::FrameLoader::detachFromParent
#6 0x332d8830 in -[WebView(WebPrivate) _close]
#7 0x332d8757 in -[WebView close]
#8 0x332d86db in -[WebView dealloc]
#9 0x35890719 in WebCoreObjCDeallocOnWebThreadImpl
#10 0x358d29ce in HandleWebThreadReleaseSource
Is there something else I need to do to prevent the leak / bad_access error?
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1 answer
It turns out that you need to follow the steps outlined here:
https://devforums.apple.com/message/10741#10741
in particular Jim's suggestion:
- (void)webViewDidStartLoad:(UIWebView *)webView
{
[webView.delegate retain];
// logic ...
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
// logic ...
[webView.delegate release];
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
// error logic ...
[webView.delegate release];
}
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
if (m_webView.loading)
{
[m_webView stopLoading];
}
// further logic ...
}
- (void)dealloc {
m_webView.delegate = nil;
[m_webView release];
...
[super dealloc];
}
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