我的 Storyboard中有一个 tableView，我在其中添加了 4 个静态单元格，我的 Storyboard看起来像:

我的 tableView 没有任何数据源，因为我的单元格是静态的。

我使用下面的代码来拖动一个单元格，它工作正常，直到我滚动一个表格。

import UIKit

class TableViewController: UITableViewController {

    var sourceIndexPath: NSIndexPath = NSIndexPath()
    var snapshot: UIView = UIView()
    let longPress: UILongPressGestureRecognizer = {
        let recognizer = UILongPressGestureRecognizer()
        return recognizer
        }()

    override func viewDidLoad() {
        super.viewDidLoad()

        longPress.addTarget(self, action: "longPressGestureRecognized:")
        self.tableView.addGestureRecognizer(longPress)

        self.tableView.allowsSelection = false
    }

    override func viewWillAppear(animated: Bool) {

        self.tableView.reloadData()
    }

    // MARK: UIGestureRecognizer
    func longPressGestureRecognized(gesture: UILongPressGestureRecognizer){

        let state: UIGestureRecognizerState = gesture.state
        let location:CGPoint = gesture.locationInView(self.tableView)
        if let indexPath: NSIndexPath = self.tableView.indexPathForRowAtPoint(location){

            switch(state){

            case UIGestureRecognizerState.Began:
                sourceIndexPath = indexPath

                let cell: UITableViewCell = self.tableView .cellForRowAtIndexPath(indexPath)!

                //take a snapshot of the selected row using helper method
                snapshot = customSnapshotFromView(cell)

                //add snapshot as subview, centered at cell's center
                var center: CGPoint = cell.center
                snapshot.center = center
                snapshot.alpha  = 0.0
                self.tableView.addSubview(snapshot)
                UIView.animateWithDuration(0.25, animations: { () -> Void in
                    center.y = location.y
                    self.snapshot.center = center
                    self.snapshot.transform = CGAffineTransformMakeScale(1.05, 1.05)
                    self.snapshot.alpha = 0.98
                    cell.alpha = 0.0
                    }, completion: { (finished) in
                        cell.hidden = true
                })

            case UIGestureRecognizerState.Changed:
                let cell: UITableViewCell = self.tableView.cellForRowAtIndexPath(indexPath)!

                var center: CGPoint = snapshot.center
                center.y = location.y
                snapshot.center = center
                print("location \(location.y)")

                //is destination valid and is it different form source?
                if indexPath != sourceIndexPath{
                    //update data source
                    //I have commented this part because I am not using any dataSource.
//                    self.customArray.exchangeObjectAtIndex(indexPath.row, withObjectAtIndex: sourceIndexPath.row)
                    //move the row
                    self.tableView.moveRowAtIndexPath(sourceIndexPath, toIndexPath: indexPath)
                    //and update source so it is in sync with UI changes
                    sourceIndexPath = indexPath
                }

                if (location.y < 68) || (location.y > 450) {
                    print("cancelled")
                    self.snapshot.alpha = 0.0
                    cell.hidden = false
                    UIView.animateWithDuration(0.10, animations: { () -> Void in

                        self.snapshot.center = cell.center
                        self.snapshot.transform = CGAffineTransformIdentity
                        self.snapshot.alpha = 0.0
                        //undo fade out
                        cell.alpha = 1.0

                        }, completion: { (finished) in
                            self.snapshot.removeFromSuperview()
                    })
                }

            case UIGestureRecognizerState.Ended:
                //clean up
                print("ended")
                let cell: UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
                cell.hidden = false

                UIView.animateWithDuration(0.25, animations: { () -> Void in

                    self.snapshot.center = cell.center
                    self.snapshot.transform = CGAffineTransformIdentity
                    self.snapshot.alpha = 0.0
                    //undo fade out
                    cell.alpha = 1.0

                    }, completion: { (finished) in
                        self.snapshot.removeFromSuperview()
                })
                break

            default:
                break
            }
        }else{
            gesture.cancelsTouchesInView = true
        }
    }

    func customSnapshotFromView(inputView: UIView) -> UIView {

        // Make an image from the input view.
        UIGraphicsBeginImageContextWithOptions(inputView.bounds.size, false, 0)
        inputView.layer.renderInContext(UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext();

        // Create an image view.
        let snapshot = UIImageView(image: image)
        snapshot.layer.masksToBounds = false
        snapshot.layer.cornerRadius = 0.0
        snapshot.layer.shadowOffset = CGSize(width: -5.0, height: 0.0)
        snapshot.layer.shadowRadius = 5.0
        snapshot.layer.shadowOpacity = 0.4

        return snapshot
    }

}

当我拖动后滚动时，它看起来像:

如您所见，单元格没有再次出现。我想拖放静态单元格，我想保存它的位置，这样我就不会在滚动时再次重新排列。

Sample项目以获取更多信息。

这只是一个演示项目，但我在单元格中添加了很多元素，每个单元格都有不同的 UI。

最佳答案

有一个库可以使用非常相似的方法完全满足您的需求。它叫做FMMoveTableView但它适用于具有数据源的单元格。

我认为导致您出现问题的原因是，当您四处移动单元格然后滚动时， Storyboard中的数据源不再与表格同步，因此您的单元格对象无法重绘。

我认为你应该这样实现你的表:

1. 让您的 4 个单元格成为自定义单元格。
2. 对每一个进行子类化。
3. 用数字 1 到 4 创建一个数组
4. 长拖时重新排序数组
5. 覆盖 cellForRowAtIndexPath 以显示正确数字的正确单元格

关于ios - 如何快速将静态单元格拖入 tableView？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33455076/