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    <p>Solve like this</p> <pre><code>- (void)rotateAccordingToAngle:(float)angle { [spinWheel setTransform:CGAffineTransformRotate(spinWheel.transform, angle)]; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [spinWheel.layer removeAllAnimations]; previousTimestamp = event.timestamp; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; if (touch.view==spinWheel) { UITouch *touch = [touches anyObject]; CGPoint center = CGPointMake(CGRectGetMidX([spinWheel bounds]), CGRectGetMidY([spinWheel bounds])); CGPoint currentTouchPoint = [touch locationInView:spinWheel]; CGPoint previousTouchPoint = [touch previousLocationInView:spinWheel]; CGFloat angleInRadians = atan2f(currentTouchPoint.y - center.y, currentTouchPoint.x - center.x) - atan2f(previousTouchPoint.y - center.y, previousTouchPoint.x - center.x); [self rotateAccordingToAngle:angleInRadians]; CGFloat angleInDegree = RADIANS_TO_DEGREES(angleInRadians); revolutions+= (angleInDegree/360.0f); } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; if (touch.view==spinWheel) { NSTimeInterval timeSincePrevious = event.timestamp - previousTimestamp; CGFloat revolutionsPerSecond = revolutions/timeSincePrevious; NSLog(@"%.3f",revolutionsPerSecond); [self startAnimationWithRevolutions:revolutionsPerSecond forTime:5.0f]; } revolutions = 0; } - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { spinWheel.userInteractionEnabled = TRUE; if (timerUpdate) { [timerUpdate invalidate]; timerUpdate = nil; } } -(void)updateTransform{ spinWheel.transform = [[spinWheel.layer presentationLayer] affineTransform]; } -(void)startAnimationWithRevolutions:(float)revPerSecond forTime:(float)time { spinWheel.userInteractionEnabled = FALSE; float totalRevolutions = revPerSecond * time; timerUpdate = [NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(updateTransform) userInfo:nil repeats:YES]; [CATransaction begin]; [CATransaction setValue:[NSNumber numberWithFloat:time] forKey:kCATransactionAnimationDuration]; CABasicAnimation* spinAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"]; CGAffineTransform transform = spinWheel.transform; float fromAngle = atan2(transform.b, transform.a); float toAngle = fromAngle + (totalRevolutions*4*M_PI); spinAnimation.fromValue = [NSNumber numberWithFloat:fromAngle]; spinAnimation.toValue = [NSNumber numberWithFloat:toAngle]; spinAnimation.repeatCount = 0; spinAnimation.removedOnCompletion = NO; spinAnimation.delegate = self; spinAnimation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseOut]; [spinWheel.layer addAnimation:spinAnimation forKey:@"spinAnimation"]; [CATransaction commit]; } </code></pre>
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    1. COThanks made easy my work
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    2. COHelped me a lot :) :) Thank you so much :) :)
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