问如何使iOS 7应用程序切换程序中使用的滑动来杀死动画？

EN

- (IBAction)panWasRecognized:(UIPanGestureRecognizer *)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateEnded && _myView.center.y >= 100)
    {
        [self resetViewPosition];
    }
    else
    {
        CGPoint translation = [recognizer translationInView:_myView.superview];

        CGPoint center = _myView.center;
        center.x += translation.x;
        center.y += translation.y;
        _myView.center = center;

        if (center.y < 100)
        {
            NSLog(@"swipe up gesture detected ...");
            [self hideView];
        }

        [recognizer setTranslation:CGPointZero inView:_myView.superview];
    }
}

- (IBAction)panWasRecognized:(UIPanGestureRecognizer *)recognizer
{
    CGPoint velocity = [recognizer velocityInView:recognizer.view];

    if (recognizer.state == UIGestureRecognizerStateEnded && _myView.center.y >= 150)
    {
        [self resetViewPosition];
    }
    else
    {
        CGPoint translation = [recognizer translationInView:_myView.superview];

        CGPoint center = _myView.center;
        center.x += translation.x;
        center.y += translation.y;
        _myView.center = center;

        if (recognizer.state == UIGestureRecognizerStateEnded && center.y < 150)
        {
            NSLog(@"swipe up gesture detected ...");

            // speed
            CGFloat xPoints = -170.0f;
            CGFloat velocityX = [recognizer velocityInView:self.view].x;
            NSTimeInterval duration = xPoints / velocityX;

            [self hideViewWithDuration:duration];
        }
    }

    [recognizer setTranslation:CGPointZero inView:_myView.superview];
}

- (void)hideViewWithDuration:(float)duration
{
    NSLog(@"Animation duration: %f", duration);

    [UIView animateWithDuration:duration
                          delay:0.0f
                        options: UIViewAnimationOptionCurveEaseOut
                     animations:^
     {
         CGRect frame = _myView.frame;
         frame.origin.y = -170;
         frame.origin.x = 10;
         _myView.frame = frame;
     }
                     completion:^(BOOL finished)
     {
         [_myView setHidden:YES];
         CGRect frame = _myView.frame;
         frame.origin.y = self.view.frame.size.height;
         frame.origin.x = 10;
         _myView.frame = frame;
         [_myView setHidden:NO];
         NSLog(@"View is hidden.");
         _hideInProgress = NO;
     }];
}

- (void)resetViewPosition
{       
    [UIView animateWithDuration:0.5
                          delay:0
                        options: UIViewAnimationOptionCurveEaseOut
                     animations:^
     {
         CGRect frame = _myView.frame;
         frame.origin.y = (self.view.frame.size.height - _myView.frame.size.height) / 2;
         frame.origin.x = 10;
         _myView.frame = frame;
     }
                     completion:^(BOOL finished)
     {
         NSLog(@"View is back to its original place.");
     }];
}