Question

我编写了一个自定义类，它提供移动和旋转图像的功能。

我需要限制移动到父视图或Superview的边界。所以，我写了下面的代码来限制它。

这在旋转图像之前工作正常。如果我尝试旋转图像然后将图像移动到边缘，图像将消失，不会留下任何记录或痕迹。

为什么它会消失，我该如何避免呢？

if(frame.origin.x < 1)
{
    frame.origin.x = 1
}
if(frame.origin.y < 1)
{
    frame.origin.y = 1
}
if(frame.maxX > superview!.frame.width)
{
    frame.origin.x = superview!.frame.width - frame.width - 1
}
if(frame.maxY > superview!.frame.height)
{
    frame.origin.y = superview!.frame.height - frame.height - 1
}

如果删除上面的代码，则没有任何内容消失，但图像会移出边界。所以我觉得上面只有一些错误。

请帮助我在轮换后正确实现此功能。

Full Movable Image类代码：

class movableImageView: UIImageView
{
    var CenCooVar = CGPoint()

    override init(image: UIImage!)
    {
        super.init(image: image)

        self.userInteractionEnabled = true

        let moveImage = UIPanGestureRecognizer(target: self, action: #selector(moveImageFnc(_:)))
        let rotateImage = UIRotationGestureRecognizer(target: self, action: #selector(rotateImageFnc(_:)))

        self.gestureRecognizers = [moveImage,rotateImage]
    }

    func moveImageFnc(moveImage: UIPanGestureRecognizer)
    {
        if moveImage.state == UIGestureRecognizerState.Began
        {
            CenCooVar = self.center
        }

        if moveImage.state == UIGestureRecognizerState.Changed
        {
            let moveCooVar = moveImage.translationInView(self.superview!)

            self.center = CGPoint(x: CenCooVar.x + moveCooVar.x, y: CenCooVar.y + moveCooVar.y)

            if(frame.origin.x < 1)
            {
                frame.origin.x = 1
            }
            if(frame.origin.y < 1)
            {
                frame.origin.y = 1
            }
            if(frame.maxX > superview!.frame.width)
            {
                frame.origin.x = superview!.frame.width - frame.width - 1
            }
            if(frame.maxY > superview!.frame.height)
            {
                frame.origin.y = superview!.frame.height - frame.height - 1
            }
        }

        if moveImage.state == UIGestureRecognizerState.Ended
        {
            CenCooVar = self.center
        }
    }

    func rotateImageFnc(rotateImage: UIRotationGestureRecognizer)
    {
        if rotateImage.state == UIGestureRecognizerState.Changed
        {
            self.transform = CGAffineTransformRotate(self.transform, rotateImage.rotation)
            rotateImage.rotation = 0
        }
    }
}

旋转后UIImageView消失并移动到边缘

0 个答案: