Open in.. for html-pages (in Safari)

I was wondering if I could create an app which supports opening .html-pages.

For 开发者_C百科example, if the app supports .pdf, when opening a .pdf, a small gray box appears with the button "Open in myApp". Can I get something like this, but then for a webpage?

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Hmm you are talking about UIDocumentInteractionController then.
Implement UIDocumentInteractionControllerDelegate in your UIViewController

- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller { return self; }
- (UIView *)documentInteractionControllerViewForPreview:(UIDocumentInteractionController *)controller { return self.view; }
- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController *)controller { return self.view.frame; }

Then add a button to the navigation bar to popup the options box:

// example: opening a .html file
NSString *index = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];

// self.controller is a UIDocumentInteractionController ivar
self.controller = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:fileToOpen]];
self.controller.delegate = self;
CGRect rect = self.navigationController.navigationBar.frame;
rect.size = CGSizeMake(1500.0f, 40.0f); // move the box right down under the button
[self.controller presentOptionsMenuFromRect:rect inView:self.view animated:YES];

A list of the applications supporting a particular document should appear. If you didn't register your app to support a type of document you still get the option "QuickLook". All this happens on whatever application is interacting with the file (since the files themselves are not exposed on the UI).