自定义表格视图单元格不滑动

Question

我有一个 TableViewController，它有一个自定义原型单元格，在 Storyboard 中设置了标识符“regularCell”。 TableViewController 属于 TimelineTableViewController.swift 类，单元格属于 TimelineTableViewCell.swift.swift 类，两者都在 Storyboard 中设置。

在 TimelineTableViewController.swift 中：

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.events.count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = self.tableView.dequeueReusableCellWithIdentifier("regularCell", forIndexPath: indexPath) as! TimelineTableViewCell
    cell.selectionStyle = .None
        let event = events[indexPath.row]
        cell.content.text = event.content
        cell.name.text = event.name
        cell.metadata.text = event.metadata
        return cell
    }

}

在 TimelineTableViewCell.swift 中，我尝试使单元格可滑动，但没有任何反应，并且没有调用平移手势识别器。

import UIKit

class TimelineTableViewCell: UITableViewCell {

var originalCenter = CGPoint()
var deleteOnDragRelease = false

@IBOutlet weak var name: UILabel!
@IBOutlet weak var content: UILabel!
@IBOutlet weak var metadata: UILabel!

override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    var recognizer = UIPanGestureRecognizer(target: self, action: "handlePan:")
    recognizer.delegate = self
    addGestureRecognizer(recognizer)
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

func handlePan(recognizer: UIPanGestureRecognizer) {
    // 1
    if recognizer.state == .Began {
        // when the gesture begins, record the current center location
        originalCenter = center
    }
    // 2
    if recognizer.state == .Changed {
        let translation = recognizer.translationInView(self)
        center = CGPointMake(originalCenter.x + translation.x, originalCenter.y)
        // has the user dragged the item far enough to initiate a delete/complete?
        deleteOnDragRelease = frame.origin.x < -frame.size.width / 2.0
    }
    // 3
    if recognizer.state == .Ended {
        // the frame this cell had before user dragged it
        let originalFrame = CGRect(x: 0, y: frame.origin.y,
            width: bounds.size.width, height: bounds.size.height)
        if !deleteOnDragRelease {
            // if the item is not being deleted, snap back to the original location
            UIView.animateWithDuration(0.2, animations: {self.frame = originalFrame})
        }
    }
}
override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
    if let panGestureRecognizer = gestureRecognizer as? UIPanGestureRecognizer {
        let translation = panGestureRecognizer.translationInView(superview!)
        if fabs(translation.x) > fabs(translation.y) {
            return true
        }
        return false
    }
    return false
}

}

会有人碰巧知道我做错了什么吗？表格中的单元格加载完美，但它们只是不可滑动，就好像我从未添加任何东西一样。非常感谢任何帮助或提示

Answer 1

终于明白了！添加手势识别器时，请在 awakeFromNib 中执行此操作。 这是工作代码：

override func awakeFromNib() {
        super.awakeFromNib()

        var panGestureRecognizer = UIPanGestureRecognizer(target: self, action: "handlePan:")
        panGestureRecognizer.delegate = self
        addGestureRecognizer(panGestureRecognizer)

    }
    func handlePan(recognizer: UIPanGestureRecognizer) {
        // 1
        if recognizer.state == .Began {
            // when the gesture begins, record the current center location
            originalCenter = center
        }
        // 2
        if recognizer.state == .Changed {
            let translation = recognizer.translationInView(self)
            center = CGPointMake(originalCenter.x + translation.x, originalCenter.y)
            // has the user dragged the item far enough to initiate a delete/complete?
            deleteOnDragRelease = frame.origin.x < -frame.size.width / 2.0
        }
        // 3
        if recognizer.state == .Ended {
            // the frame this cell had before user dragged it
            let originalFrame = CGRect(x: 0, y: frame.origin.y,
                width: bounds.size.width, height: bounds.size.height)
            if !deleteOnDragRelease {
                // if the item is not being deleted, snap back to the original location
                UIView.animateWithDuration(0.2, animations: {self.frame = originalFrame})
            }
        }
    }
    override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
        if let panGestureRecognizer = gestureRecognizer as? UIPanGestureRecognizer {
            let translation = panGestureRecognizer.translationInView(superview!)
            if fabs(translation.x) > fabs(translation.y) {
                return true
            }
            return false
        }
        return false
    }

不要为重写 init 而烦恼。朋友建议的另一种替代解决方案是将滚动视图添加到单元格内容视图并从那里开始工作。希望这可以帮助！ 并感谢所有帮助过的人！