Question

我试图使用UIPanGestureRecognizer来移动我的物体，但我似乎无法让它顺利移动。当我向特定方向移动并向相反方向移动时，它不会立即作出反应。我假设值可能有问题，因为它在“ - ＆gt;”中是正数。方向和否定的“＆lt; - ”。

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问题？

提前致谢。

Answer 1

您应该重置UIPanGestureRecognizer的翻译价值：

- (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)
}

对我来说效果不错，而不会乘以0.0001f :)

UIPanGestureRecognizer没有顺利移动对象

2 个答案: