ios - 图片放大时如何隐藏背景

Question

我有一个点击手势识别器连接到我的 ImageView 。当点击图像时，它会变成全屏，当再次点击时，它会消失。用户可以缩放图像，但是当用户按住图像并四处移动时，它会显示背景 View 。我想隐藏背景，以便在图像被关闭之前看不到 View 。我认为我提供的图片比文字解释得更好。

var newImageView: UIImageView!



@IBAction func imageTapped(_ sender: UITapGestureRecognizer)  {
    self.navigationController?.setNavigationBarHidden(true, animated: true)

    let imageView = sender.view as! UIImageView

    let scrollView = UIScrollView(frame: self.view.frame)


    newImageView = UIImageView(image: imageView.image)
    newImageView.frame = self.view.frame
    newImageView.backgroundColor = .black
    newImageView.contentMode = .scaleAspectFit
    newImageView.isUserInteractionEnabled = true


    let tap = UITapGestureRecognizer(target: self, action: #selector(dismissFullscreenImage))
    scrollView.addGestureRecognizer(tap)


    scrollView.delegate = self
    scrollView.minimumZoomScale = 1.0
    scrollView.maximumZoomScale = 3.0

    scrollView.addSubview(newImageView)

    self.view.addSubview(scrollView)
}

func viewForZooming(in scrollView: UIScrollView) -> UIView?
{
    return newImageView;
}

func dismissFullscreenImage(_ sender: UITapGestureRecognizer) {
    self.navigationController?.setNavigationBarHidden(false, animated: true)
    sender.view?.removeFromSuperview()
}

Answer 1

您可以使用 backgroundElement.isHidden = true 属性简单地隐藏元素。关闭 View 后，您可以使用 backgroundElement.isHidden = false 重置背景。