Question

I need to place a photo in the screen and it should be able to be scrolled or zoomed,

I know UIScrollView does these, so I alloced one, but how about my photo?

I guess I should not just set the photo as the backgroundColor of my UIScrollView, and I haven’t found any property of UIScrollView, in the document, to hold an image, such as “imageView”, “contentView”, or something like that.

So, what should I do to make a picture in my screen and make it able to respond to finger touches?

Thanks a lot!

Answer 1

Add the UIImageView to the UIScrollView and set the min/max scale value to it.

Then implement the following UIScrollViewDelegate function.

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView  {
    return yourImageView;
}

If you want to have multiple items scaled, add all the view into a UIView, and put that UIView inside the UIScrollView. Of course you have to change the return view to that UIView in the above function.