How to scroll and zoom in/out large images on iPhone?
- by Horace Ho
I have a large image, size around 30000 (w) x 6000 (h) pixels. You may consider it's like a big map. I assume I need to crop it up into smaller tiles. Questions:
what are the right ViewControllers to use?
(link) what is the tile strategy? (I put this in another question, as it's not iPhone specific)
Requirements:
whole image (though cropped) can be scrolled up/down/left/right by swipes
zoom in (up to pixel-to-pixel) out (down to screen-fit-by-height) by the 2-finger operation
memory efficiency by lazy loading tiles
Bonus requirements:
automatic scroll, say from left to right slowly and smoothly
Thanks!