我有一个带有两个图像的UITableViewCell,我的目标是在用户长按时扩展这些图像。在最好的情况下,图像会覆盖整个屏幕,用一个小的“x”或其他东西来关闭。
我在自定义UITableViewCell中使用了以下函数,但图像只会扩展单元格的大小。我不知道如何在superview的整个tableview/navBar/tabbar上展开图像。

@objc func answerOneLongPress(_ sender: UILongPressGestureRecognizer) {
    let imageView = sender.view as! UIImageView
    let newImageView = UIImageView(image: imageView.image)
    let screenSize = UIScreen.main.bounds
    let screenWidth = screenSize.width
    let screenHeight = screenSize.height
    newImageView.frame = CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight)
    newImageView.backgroundColor = .black
    newImageView.contentMode = .scaleAspectFit
    self.addSubview(newImageView)
}

如果你需要更多的信息,请告诉我。我觉得这应该发生在UITableViewController中,而不是在细胞中,但还不能让它那样工作。

最佳答案

不应将视图添加到单元格,而应将其添加到视图控制器或关键点窗口。这取决于你的需要。在你的例子中,你的图像视图被添加到一个单元格中,并且被剪裁,而且它的位置也不正确。
我会使用某种对象来处理这个图像的呈现。让代码自己说话:

class ImageOverlayController {

    private var startFrame: CGRect
    private var backgroundView: UIView
    private var imageView: UIImageView

    private init(startFrame: CGRect, backgroundView: UIView, imageView: UIImageView) {
        self.startFrame = startFrame
        self.backgroundView = backgroundView
        self.imageView = imageView
    }

    private convenience init() { self.init(startFrame: .zero, backgroundView: UIView(), imageView: UIImageView())  }

    static func showPopupImage(inController viewController: UIViewController? = nil, fromImageView imageView: UIImageView) -> ImageOverlayController {
        guard let targetView = viewController?.view ?? UIApplication.shared.keyWindow else { return ImageOverlayController() } // This should never happen

        let startFrame = imageView.convert(imageView.bounds, to: targetView)

        let backgroundView: UIView = {
            let view = UIView(frame: targetView.bounds)
            view.backgroundColor = UIColor.black.withAlphaComponent(0.0)
            return view
        }()

        let newImageView: UIImageView = {
            let view = UIImageView(frame: startFrame)
            view.image = imageView.image
            return view
        }()

        let controller = ImageOverlayController(startFrame: startFrame, backgroundView: backgroundView, imageView: imageView)

        backgroundView.addSubview(newImageView)
        targetView.addSubview(backgroundView)

        UIView.animate(withDuration: 0.3) {
            backgroundView.backgroundColor = UIColor.black.withAlphaComponent(0.5)
            newImageView.frame = targetView.bounds
        }

        return controller

    }

    func dimiss(completion: (() -> Void)? = nil) {
        UIView.animate(withDuration: 0.3, animations: {
            self.imageView.frame = self.startFrame
            self.backgroundView.backgroundColor = self.backgroundView.backgroundColor?.withAlphaComponent(0.0)
        }) { _ in
            self.backgroundView.removeFromSuperview()
            completion?()
        }
    }

}

正如您所说,仍然必须添加一个按钮,然后在视图上调用dispose。
注意:我提供的代码并没有经过真正的测试,只是很快地组合起来。如果有任何问题,请告诉我,以便我修改。

关于ios - 展开UITableViewCell UIImage,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/51147726/

10-15 06:32