Question

In my application I use IKImageview to preview a image,and by default it supports two finger gestures like moving up,down,left,right.
Now I want to add rotate and zoom gestures to it ,does anyone has any good ideas?
Thank you very much.

does anyone know how to subclass IKImageview to support zoom gesture?

Answer 1

Finally figure it out.
Just subclass the IKImageView and add:

- (void)rotateWithEvent:(NSEvent *)event{
    [self setFrameCenterRotation:([self frameCenterRotation] + [event rotation])];
}

Problem solved!