Add functionality to zoom in/out an image in an iPhone app

Question

In iPhone App I want add functionality to (imageview or webview or other control) zoom in/out an image with pinch gesture.

@ Warif Akhand Rishi : no I want to just display images with zoom in or or zoom out facility — ios, Jun 05 '12 at 06:43
@Prerak: I have added the answer for the "facility" cum functionality of the zoom in and zoom out feature for the image view. — Parth Bhatt, Jun 05 '12 at 06:44
@Prerak : Check this link : http://stackoverflow.com/search?q=[iPhone]zoom+in%2Fout+using+Pinch&submit=search I have used SO search feature... — Devang, Jun 05 '12 at 06:45
http://stackoverflow.com/questions/677006/how-to-zoom-image-in-iphone — Hector, Jun 05 '12 at 06:46
refer this : http://stackoverflow.com/questions/500027/how-to-zoom-in-out-an-uiimage-object-when-user-pinches-screen — Hector, Jun 05 '12 at 06:46
You might want to check this : http://www.iphonesdkarticles.com/2008/09/multi-touch-tutorial-3.html — JudeJitsu, Jun 05 '12 at 06:29

Pfitz · Answer 1 · 2012-06-05T07:21:46.047

3

You can use a UIScrollView for that.

Add a UIImageView to the UIScrollViewand configure the UIScrollView for zooming via its propertys. Check the UIScrollview Class Reference - Zooming and Panning Section

Edit: Good point by Mike: Check the PhotoScrollersample code by Apple, too

edited Jun 05 '12 at 07:21

answered Jun 05 '12 at 06:30

Pfitz

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Also see the Apple "PhotoScroller" sample code which contains an ImageScrollView class which does this. It also handles some special cases like rotation that might interest you. – Mike Weller Jun 05 '12 at 07:15

score 0 · Answer 2 · answered Jun 05 '12 at 06:39

Please refer to this code. I have used it in one of my apps so it works:

- (IBAction)handlePinch:(UIPinchGestureRecognizer *)recognizer {

    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
    recognizer.scale = 1;
}

Also don't forget to add Pinch gesture recognizer to your imageView.

enter image description here

Hope this helps.

Add functionality to zoom in/out an image in an iPhone app

2 Answers2