Question

我有一个包含图像视图的滚动视图。我向该图像添加了一些UIview，我想将它们拖放到图像区域。

我已经使用UIPanGestureRecognizer（Draggable UIView Swift 3）但这不起作用。

@IBOutlet weak var mapImage: UIImageView!
@IBOutlet weak var scrollView: UIScrollView!
 override func viewDidLoad() {
        let viewDemo = UIView()
        scrollView.minimumZoomScale = 1.0
        scrollView.maximumZoomScale = 6.0
        let panGesture = UIPanGestureRecognizer(target: self, action: 
        #selector(moveObject(_:)))
        viewDemo.frame = CGRect(x: 50, y: 50, width: 40, height: 40)
        viewDemo.backgroundColor = .red
        viewDemo.layer.cornerRadius = 20
        viewDemo.isUserInteractionEnabled = true
        viewDemo.addGestureRecognizer(panGesture)
        mapImage.addSubview(viewDemo)

}
   @objc func moveObject(_ gesture: UIPanGestureRecognizer){

        //1. Check That We Have A Valid Draggable View
        guard let draggedObject = gesture.view else { return }

        if gesture.state == .began || gesture.state == .changed {

            //2. Set The Translation & Move The View
            let translation = gesture.translation(in: self.view)
            draggedObject.center = CGPoint(x: draggedObject.center.x + translation.x, y: draggedObject.center.y + translation.y)
            gesture.setTranslation(CGPoint.zero, in: self.view)


        }else if gesture.state == .ended {

        }
    }

当我拖放UIview时，moveObject无法执行。我已经尝试使用scrollView?.isScrollEnabled = false

禁用滚动视图

Answer 1

您必须启用UIImageView的用户交互。

mapImage.isUserInteractionEnabled = true

在滚动视图中拖动uiview

1 个答案: