平移图像后面的黑色背景。斯威夫特 3

Posted 2023-05-08

【中文标题】平移图像后面的黑色背景。斯威夫特 3

【英文标题】：Black background behind panned images. Swift 3

【发布时间】：2017-07-21 12:10:07

【问题描述】：

class PhotoViewController: UIViewController 

override var prefersStatusBarHidden: Bool 
    return true


private var backgroundImage: UIImage

init(image: UIImage) 
    self.backgroundImage = image
    super.init(nibName: nil, bundle: nil)
    print(image)


required init?(coder aDecoder: NSCoder) 
    fatalError("init(coder:) has not been implemented")


override func viewDidLoad() 
    super.viewDidLoad()






    self.view.backgroundColor = UIColor.gray
    let backgroundImageView = UIImageView(frame: view.frame)
    backgroundImageView.image = backgroundImage
    view.addSubview(backgroundImageView)




    let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognizerAction(_:)))
    self.view.addGestureRecognizer(panGestureRecognizer)

    let cancelButton = UIButton(frame: CGRect(x: 10.0, y: 10.0, width: 20.0, height: 20.0))
    cancelButton.setImage(#imageLiteral(resourceName: "cancel"), for: UIControlState())
    cancelButton.addTarget(self, action: #selector(cancel), for: .touchUpInside)
    let next = UIButton(frame: CGRect(x: (view.frame.width)-90, y: (view.frame.height)-125, width: 70, height: 70))
    next.setImage(#imageLiteral(resourceName: "Next"), for: UIControlState())
    next.addTarget(self, action: #selector(cancel), for: .touchUpInside)
    view.addSubview(next)
    view.addSubview(cancelButton)





func panGestureRecognizerAction(_ gesture: UIPanGestureRecognizer)
    let translation = gesture.translation(in: view)
    view.frame.origin.y = translation.y

    if gesture.state == .ended

        if view.frame.origin.y > 100 && view.frame.origin.y < 200
            UIView.animate(withDuration: 0.5, animations:  

                dismiss(animated: false, completion: nil)

            )
         else
            UIView.animate(withDuration: 0.3, animations:  

                self.view.frame.origin = CGPoint(x: 0, y: 0)
            )
        
    

当我向上或向下平移并将图像视图向下拖动时，即使我将其指定为灰色，背景也是黑色的。背景怎么可能是我选择的颜色。如果需要更多所需信息来回答问题，请告诉我

【参考方案1】：

看起来您的 panGestureRecognizerAction 正在移动 view 而不是 backgroundImageView

【讨论】：

我怎样才能让它移动 backgroundImageView 当我尝试这样做时它给了我一个错误。非常感谢您的回答无论如何都很有意义

这里有一个很好的教程：ioscreator.com/tutorials/dragging-views-gestures-tutorial-ios10 ... 几乎没有进行任何更改以将“可拖动”UIView 与“可拖动”UIImageView 匹配。