I am trying to use a WebView to render a page in order to create a
thumbnail for a CoreData managed entity. I have a custom
NSManagedObject subclass WebSiteManagedObject with a setUrl: that calls:
NSRect rect = NSMakeRect(0, 0, 900, 1164);
webView = [[WebView alloc] initWithFrame:rect frameName:@"thumbnail"
groupName:nil];
[webView setFrameLoadDelegate:self];
[webView setMainFrameURL:value];
My WebSiteManagedObject is setup as the delegate, and I track the
icon, title and frame load messages. I need to know when it is safe to
cleanup the WebView, but I can't seem to deterministically figure out
when the WebView is actually done from the delegate calls. I assumed
that webView:didFinishLoadForFrame: would be the final delegate call,
which it often is, but periodically, I get webView:didReceiveTitle:
after the last didFinishLoadForFrame: (in all cases, it seems to be
related to redirects).
Does anyone know a good way to determine when the WebView is REALLY
done so I can release it? I've included the delegate implementations
below. Thanks for any advice. (I realize my approach may be
fundamentally flawed as well).
- (void)webView:(WebView *)sender didReceiveTitle:(NSString *)title
forFrame:(WebFrame *)frame
{
if(frame == [sender mainFrame]) {
[self setValue:title forKey:@"title"];
}
}
- (void)webView:(WebView *)sender didReceiveIcon:(NSImage *)image
forFrame:(WebFrame *)frame
{
if(frame == [sender mainFrame]) {
[self setValue:[image TIFFRepresentation] forKey:@"favicon"];
}
}
- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame
*)frame
{
if(frame == [sender mainFrame]) {
...
[self setValue:[image TIFFRepresentation] forKey:@"thumbnail"];
[sender autorelease];
}
}
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