}elseif (self.panGesture.state == UIGestureRecognizerStateEnded)
{
endPoint = [self.panGesturelocationInView:self.moveView];
CGPoint velocity = [self.panGesture velocityInView:self.moveView];
vMax = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
aVelocity = 1000.0;
useTime = vMax/aVelocity;
[UIViewanimateWithDuration:useTimedelay:0options:UIViewAnimationOptionCurveEaseOutanimations:^{
[self decelerateSetup];
} completion:nil];
[self.panGesturesetTranslation:CGPointMake(0, 0) inView:self.moveView];
}
//匀减速
-(void)decelerateSetup
{
[timerinvalidate];
timer = Nil;
timer = [NSTimerscheduledTimerWithTimeInterval:0.001target:selfselector:@selector(decelerate:) userInfo:Nilrepeats:YES];
}
-(void)decelerate:(id)sender
{
usedTime = usedTime + 0.001;
CGFloat v1 = vMax - aVelocity * usedTime;
CGFloat passRoad = (vMax * vMax - v1 * v1)/(2*aVelocity);//代表弧度
currentRadius = passRoad/320*2;//半径是 320，
currentRadius = passRoad/M_PI*2;
// if (endPoint.x > beginPoint.x) {
// currentRadius = -currentRadius;
// }
if (v1 <= 0) {
[timer invalidate];
timer = Nil;
useTime = 0;
usedTime= 0;
[[SoundManagershareSoundManager]stopPlay];
}else{
self.moveView.transform = CGAffineTransformMakeRotation(currentRadius);
}
}