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How To Rotate an UIImageView based on a point in Touches Moved Method?
CGAffineTransform transforms = CGAffineTransformMakeRotation(M_PI/2);

imgView.transform = transforms;

CGAffineTransform transforms = CGAffineTransformRotate(imgView.transform, M_PI/2);

imgView.transform = transforms;

-(void)transformImagewithTouches:(UITouch *)touchLocation
{
    //NSLog(@"Before %f",self.fltRotatedAngle);
    CGPoint touchLocationpoint = [touchLocation locationInView:[self superview]];
    CGPoint PrevioustouchLocationpoint = [touchLocation previousLocationInView:[self superview]];
    CGPoint origin;
    origin.x=self.center.x;
    origin.y=self.center.y;
    CGPoint previousDifference = [self vectorFromPoint:origin toPoint:PrevioustouchLocationpoint];
    CGAffineTransform newTransform =CGAffineTransformScale(self.transform, 1, 1);
    CGFloat previousRotation = atan2(previousDifference.y, previousDifference.x);
    CGPoint currentDifference = [self vectorFromPoint:origin toPoint:touchLocationpoint];
    CGFloat currentRotation = atan2(currentDifference.y, currentDifference.x);
    CGFloat newAngle = currentRotation- previousRotation;

    //Calculate Angle to Store
    fltTmpAngle = fltTmpAngle+newAngle;
    self.fltRotatedAngle = (fltTmpAngle*180)/M_PI;

    newTransform = CGAffineTransformRotate(newTransform, newAngle);
    [self animateImageView:self toPosition:newTransform];
}

-(void)animateImageView:(UIImageView *)theView toPosition:(CGAffineTransform) newTransform
{
    [UIView setAnimationsEnabled:YES];
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:0.0750];
    self.transform = newTransform;
    [UIView commitAnimations];
}

-(CGPoint)vectorFromPoint:(CGPoint)firstPoint toPoint:(CGPoint)secondPoint
{
    CGFloat x = secondPoint.x - firstPoint.x;
    CGFloat y = secondPoint.y - firstPoint.y;
    CGPoint result = CGPointMake(x, y);
    return result;
}

CGAffineTransform transforms = CGAffineTransformConcat(imgView.transform,CGAffineTransformMakeRotation(M_PI/2));
imgView.transform = transforms;

pCalculator.tangentToCornerAngle  is the desired angle in which rotation has to be made.

Function is CATransform3DMakeRotation(CGFloat angle, CGFloat x, <CGFloat y, CGFloat z);