設(shè)置代理

<UIDocumentInteractionControllerDelegate>

初始化

UIDocumentInteractionController *docVc = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:@"PDF的URL"]];
docVc.delegate = self;
[docVc presentPreviewAnimated:YES];

代理方法

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