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copied!<pre><code>#import "RotationTestViewController.h" @interface RotationTestViewController() -(void)transformSpinnerwithTouches:(UITouch *)touchLocation; -(CGPoint)vectorFromPoint:(CGPoint)firstPoint toPoint:(CGPoint)secondPoint; -(void)animateView:(UIView *)theView toPosition:(CGAffineTransform) newTransform; @end @implementation RotationTestViewController - (void)viewDidLoad { [super viewDidLoad];} -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch *touch in touches) { // Send to the dispatch method, which will make sure the appropriate subview is acted upon // currentTouch=touch; } } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch *touch in touches){ // Sends to the dispatch method, which will make sure the appropriate subview is acted upon } } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch=[[event allTouches]anyObject]; if (touch.view==Spinner) { [self transformSpinnerwithTouches:touch]; } } -(void)transformSpinnerwithTouches:(UITouch *)touchLocation { CGPoint touchLocationpoint = [touchLocation locationInView:self.view]; CGPoint PrevioustouchLocationpoint = [touchLocation previousLocationInView:self.view]; //origin is the respective piont from that i gonna measure the angle of the current position with respective to previous position .... CGPoint origin; origin.x=Spinner.center.x; origin.y=Spinner.center.y; CGPoint previousDifference = [self vectorFromPoint:origin toPoint:PrevioustouchLocationpoint]; CGAffineTransform newTransform =CGAffineTransformScale(Spinner.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; temp1=temp1+newAngle; NSLog(@"Angle:%F\n",(temp1*180)/M_PI); newTransform = CGAffineTransformRotate(newTransform, newAngle); [self animateView:Spinner toPosition:newTransform]; } -(void)animateView:(UIView *)theView toPosition:(CGAffineTransform) newTransform { [UIView setAnimationsEnabled:YES]; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:0.0750]; Spinner.transform = newTransform; [UIView commitAnimations]; } //-(CGFloat)distanceFromPoint:(CGPoint)fromPoint toPoint:(CGPoint)toPoint // //{ //float x = toPoint.x - fromPoint.x; //float y = toPoint.y - fromPoint.y; //return hypot(x, y); //} -(CGPoint)vectorFromPoint:(CGPoint)firstPoint toPoint:(CGPoint)secondPoint { CGFloat x = secondPoint.x - firstPoint.x; CGFloat y = secondPoint.y - firstPoint.y; CGPoint result = CGPointMake(x, y); //NSLog(@"%f %f",x,y); return result; } -(void) dealloc { [Spinner release]; [super dealloc]; } </code></pre>

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