Ios 使用UIPangestureRecognitor移动时，图片始终移回原点

我尝试以编程方式实现平移手势，但尝试时，uiview总是在移动过程中移回superview中的原点。所以事实上，它从原点向前跳到新的位置。 有人知道问题出在哪里吗

代码：

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从“关于变换和自动布局”中查看

- (void)setGesture
{
    self.userInteractionEnabled = YES;
        UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(detectPan:)];
        self.gestureRecognizers = @[panRecognizer];


}

- (void) detectPan:(UIPanGestureRecognizer *) penGes
{
    if ((penGes.state == UIGestureRecognizerStateChanged) ||
        (penGes.state == UIGestureRecognizerStateEnded))
    {

        CGPoint translation = [penGes translationInView:self.superview];
        self.center = CGPointMake(self.lastLocation.x + translation.x,
                              self.lastLocation.y + translation.y);

       [penGes setTranslation:CGPointZero inView:self];
    }
}
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Promote the touched view
    [self.superview bringSubviewToFront:self];

    // Remember original location
    self.lastLocation = self.center;
}