Question

I have a pdf page displayed with CGContextDrawPDFPage.

I want to keep this page shown and have an image slide in from top over this page, just as it can be seen in the iBooks application.

It’s a book, the sliding image is a bookmark that slides in when you are about to close the book.

What is the best way to go about implementing this?

Answer 1

Try using a UIView animation block that moves the frame of a UIImageView from above the top (offscreen) to somewhere below the top.

For example, assuming the image is 100 x 200:

[imageView setFrame:CGRectMake(150, -200, 100, 200)];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
[imageView setFrame:CGRectMake(150, 0, 100, 200)];
[UIView commitAnimations];      

Just make sure that imageView is the top-most subview and not hidden.