IOS: rotate an uiimageview

Question

in my app I have an imageview, its name is arrow and I rotate it of 180 degrees in this way:

arrow.transform = CGAffineTransformMakeRotation(M_PI);


        

Answer 1

To make it return to it's original position, just do this:

arrow.transform = CGAffineTransformMakeRotation(0);

In degrees, 0 radians is 0 degrees, so it should return to its original position.

Answer 2

Try setting the transform property back to the identity matrix. i.e. CGAffineTransformIdentity

Answer 3

Swift3:

arrow.transform = CGAffineTransform(rotationAngle: rotation);

where rotation is the angle to rotate in radians.