嗯，你說的是UIDocumentInteractionController那麼。
實施UIDocumentInteractionControllerDelegate在UIViewController
- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller { return self; }
- (UIView *)documentInteractionControllerViewForPreview:(UIDocumentInteractionController *)controller { return self.view; }
- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController *)controller { return self.view.frame; }
然後添加一個按鈕，導航欄，彈出選項對話框：
// 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];
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