CODEWITHSUNDEEP
objective-ciosuiscrollview
AlexP
AlexP

Reputation: 1466

UIScrollView: zoom scale for each dimension/axis

When using UIScrollView for zooming, it seems that aspect ratio of a visible content is constant. I would like to manage horizontal and vertical zoom independently. For example, if fingers touch screen horizontally then only horizontal scroll is changed. I noticed that type of UIScrollView.zoomScale is float (for all dimensions altogether). Is it possible to workaround this problem?

Details: I am working on an OpenGL ES based app and I'd like to use UIKit's scroll for a nice look and to save time implementing one.

Upvotes: 1

Views: 494

Answers (1)

fzwo
fzwo

Reputation: 9902

I guess in your case you're better off not using a UIScrollView, and instead setting up a UIPinchGestureRecognizer yourself on the views you want to transform.

The GestureRecognizer would track the fingers and decide whether (and how much) to scale in which dimension. Based on this, you can set your view's transform property. As an example, a transformation matrix that doubles the width but leaves height intact would be CGAffineTransformMakeScale(2.0, 1.0).

To leverage UIScrollView's scrolling, you then embed your view into a UIScrollView, and set the contentSize and contentOffset properties accordingly from your GestureRecognizer's callback methods.

Upvotes: 2

Related Questions