Question

我在splitViewController中有这2个tableViews（所有可用的服务和提供的服务）。这个想法是，然后单元格移动到屏幕中心，它移动到服务提供表视图。一切正常，除了触摸`.began，单元格被添加到覆盖navBar的tableView的顶部。

在.changed上，它跟着我的手指

我希望将视图/单元格添加到触摸开始的位置，在我正在触摸的“ServiceCell”之上。我尝试将其添加到splitViewController.view，但我认为我的逻辑存在问题。

这里是代码：

func didLongPressCell (gr: UILongPressGestureRecognizer) {
    let serviceCell:ServiceCell =  gr.view as! ServiceCell
    switch gr.state {
    case .began:

        let touchOffsetInCell = gr.location(in: gr.view)
        let dragEvent = DragganbleServiceCell()
        mDraggableServiceCell = dragEvent.makeWithServiceCell(serviceCell: serviceCell, offset: self.tableView.contentOffset, touchOffset: touchOffsetInCell)
        self.splitViewController?.view.addSubview(mDraggableServiceCell!)

    case .changed:
        let cp:CGPoint = gr.location(in: self.view)
        let newOrigin = CGPoint(x: (cp.x), y: (cp.y) - (mDraggableServiceCell?.touchOffset?.y)!)
        UIView.animate(withDuration: 0.1, animations: {
            self.mDraggableServiceCell?.frame = CGRect(origin: newOrigin, size: (self.mDraggableServiceCell?.frame.size)!)  
        })

    case .ended:
        let detailViewNC = self.splitViewController?.viewControllers[1] as! UINavigationController
        let detailView = detailViewNC.topViewController as! ServiceOfferedTableViewController
        if (mDraggableServiceCell?.frame.intersects(detailView.tableView.frame))! {

        onDragEnded(serviceCell:serviceCell)
        }else{

        mDraggableServiceCell?.removeFromSuperview()

        }
    default:
        print("Any other action?")
    }
}

在DraggableServiceCell：

class DragganbleServiceCell: ServiceCell {

    var originalPosition:CGPoint?
    var touchOffset:CGPoint?

    func makeWithServiceCell(serviceCell:ServiceCell, offset:CGPoint, touchOffset:CGPoint)->DragganbleServiceCell{

        let newFrame =  CGRect(x: serviceCell.frame.origin.x, y: serviceCell.frame.origin.y, width: serviceCell.frame.size.width, height: serviceCell.frame.size.height)
        let dragCell = DragganbleServiceCell(frame: newFrame)
       dragCell.touchOffset = touchOffset
        dragCell.service = serviceCell.service
        dragCell.serviceName.text = serviceCell.service?.service_description
        return dragCell
    }

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        self.containingView.backgroundColor = UIColor.rgb(230, green: 32, blue: 31)
        self.serviceName.textColor = .white
    }

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

Answer 1

您的问题出在makeWithServiceCell(serviceCell:ServiceCell, offset:CGPoint, touchOffset:CGPoint) -> DragganbleServiceCell。 serviceCell的框架相对于包含tableView的{{1}}而非UISplitViewController的视图，您永远不会使用offset或{{1} }值来纠正这个。因此，请尝试以与touchOffset事件中相同的方式调整框架。

您甚至可能会发现.changed上的convert(_:to:)方法对于在两个视图之间进行UIView转换可能很有用。查看更多详情here。

Answer 2

如果您没有这样做并更改此部分代码，我建议将手势添加到self.splitViewController?.view而不是self.view。

case .changed:
    let cp:CGPoint = gr.location(in: self.view)
    let newOrigin = CGPoint(x: (cp.x), y: (cp.y) - (mDraggableServiceCell?.touchOffset?.y)!)
    UIView.animate(withDuration: 0.1, animations: {
        self.mDraggableServiceCell?.frame = CGRect(origin: newOrigin, size: (self.mDraggableServiceCell?.frame.size)!)  
    })

到这个

case .changed:
    let cp:CGPoint = gr.location(in: self.splitViewController?.view)
    UIView.animate(withDuration: 0.1, animations: {
        self.mDraggableServiceCell?.center = cp  
    })

尝试一次。

拖放 - UIGestureRecognizer - 查看添加不是我想要的地方

2 个答案: