UIPanGestureRecognizer 不能平滑移动物体

Question

我正在尝试使用 UIPanGestureRecognizer 来移动我的对象，但我似乎无法让它顺利移动。当我朝一个特定的方向移动并转向相反的方向时，它不会立即做出反应。我认为该值可能有问题，因为它在“->”方向上是正数，在“

我的代码如下：

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
    {    
        CGPoint pointA = [panRecognizer locationInView:self.view];
        CGPoint pointB = [panRecognizer translationInView:self.view];

        if(panRecognizer.state == UIGestureRecognizerStateEnded ||
           panRecognizer.state == UIGestureRecognizerStateChanged) {     
            _camera.x += pointB.x * 0.0001f;
        }
    }

有没有人有更合适的方法来解决这个任务？

提前致谢。

Answer 1

你应该重置 UIPanGestureRecognizer 的翻译值：

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{    
   CGPoint point = [panRecognizer translationInView:self.view];
   _camera.x += point.x * 0.0001f;
   [panRecognizer setTranslation:CGPointZero inView:self.view];
}

Answer 2

斯威夫特 3：

func panDetected(recognizer: UIPanGestureRecognizer) {
    let translation = recognizer.translation(in: recognizer.view)

    _camera.x += translation.x
    _camera.y += translation.y

    recognizer.setTranslation(CGPoint.zero, in: recognizer.view)
}

不乘以 0.0001f 对我有好处 :)