How to know the current scale of a UIView?

Question

How do you find the current scale (zoom level) of a UIView?

Answer 1

That functionality is provided with UIScrollView and it's zoomScale property.

EDIT:

Knowing the current scale is given by the transformation matrix. The scale values, as you know, are here:

sx, 0,  0
0 , sy, 0
. . .. ,1. 

To get the current state, just record the transform's state. To return to that state, however, you'll need to use the inverse of your last transformation or load the identity matrix.