Do you have an idea on the application where you want to implement pinch and zoom feature on your image ?

You will have to use a ScrollView. Embed your imageView on this ScrollView.

The delegate class of ScrollView must be implemented because we will have to use the viewForZoomingInScrollView: method and return the view to zoom.You set the values of the minimumZoomScale and maximumZoomScale properties of the scrollview to specify the amount the user can zoom.

We will be happy to help if you still need some advice.