展开和折叠tableview单元格

Question

我能够扩展和折叠单元格,但我想在UITableViewCell中调用函数(展开和折叠)来更改按钮标题.

import UIKit

class MyTicketsTableViewController: UITableViewController {

    var selectedIndexPath: NSIndexPath?
    var extraHeight: CGFloat = 100

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 5
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! MyTicketsTableViewCell
        return cell
    }

    override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        if(selectedIndexPath != nil && indexPath.compare(selectedIndexPath!) == NSComparisonResult.OrderedSame) {
            return 230 + extraHeight
        }

        return 230.0
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        if(selectedIndexPath == indexPath) {
            selectedIndexPath = nil
        } else {
            selectedIndexPath = indexPath
        }

        tableView.beginUpdates()
        tableView.endUpdates()
    }
}

import UIKit

class MyTicketsTableViewCell: UITableViewCell {

    @IBOutlet weak var expandButton: ExpandButton!
    @IBOutlet weak var detailsHeightConstraint: NSLayoutConstraint!

    var defaultHeight: CGFloat!

    override func awakeFromNib() {
        super.awakeFromNib()

        defaultHeight = detailsHeightConstraint.constant

        expandButton.button.setTitle("TAP FOR DETAILS", forState: .Normal)
        detailsHeightConstraint.constant = 30
    }

    func expand() {
        UIView.animateWithDuration(0.3, delay: 0.0, options: .CurveLinear, animations: {
            self.expandButton.arrowImage.transform = CGAffineTransformMakeRotation(CGFloat(M_PI * 0.99))
            self.detailsHeightConstraint.constant = self.defaultHeight
            self.layoutIfNeeded()

            }, completion: { finished in
                self.expandButton.button.setTitle("CLOSE", forState: .Normal)
        })
    }

    func collapse() {
        UIView.animateWithDuration(0.3, delay: 0.0, options: .CurveLinear, animations: {
            self.expandButton.arrowImage.transform = CGAffineTransformMakeRotation(CGFloat(M_PI * 0.0))
            self.detailsHeightConstraint.constant = CGFloat(30.0)
            self.layoutIfNeeded()

            }, completion: { finished in
                self.expandButton.button.setTitle("TAP FOR DETAILS", forState: .Normal)
        })
    }

}

Answer 1

如果您希望细胞体积更大,那么您在商店IndexPath的heightForRow:使用位置:

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    if selectedIndexPath == indexPath {
      return 230 + extraHeight
    }
    return 230.0
}

然后当你想在didSelectRow中展开一个时:

selectedIndexPath = indexPath
tableView.beginUpdates
tableView.endUpdates

编辑

这将使细胞自身变大,你不需要细胞中额外的动画块.

编辑2

 override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        if(selectedIndexPath == indexPath) {
          selectedIndexPath = nil

          if let cell = tableView.cellForRowAtIndexPath(indexPath) as? MyTicketsTableViewCell {
            cell.collapse()
          }
          if let cell = tableView.cellForRowAtIndexPath(NSIndexPath(forRow:indexPath.row+1, section: indexPath.section) as? MyTicketsTableViewCell {
            cell.collapse()
          }
        } else {
          selectedIndexPath = indexPath

          if let cell = tableView.cellForRowAtIndexPath(indexPath) as? MyTicketsTableViewCell {
              cell.expand()
          }

          if let cell = tableView.cellForRowAtIndexPath(NSIndexPath(forRow:indexPath.row+1, section: indexPath.section) as? MyTicketsTableViewCell {
             cell.expand()
          }
        }

        tableView.beginUpdates()
        tableView.endUpdates()
    }

Answer 2

您所需UITableView要做的就是以这种方式实施Delegate：

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
}

override func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
}

默认情况下，estimatedHeightis为CGRectZero，当您为其设置一些值时，它会启用自动调整大小（与情况相同UICollectionView），您甚至可以这样做：

tableView?.estimatedRowHeight = CGSizeMake(50.f, 50.f); 

然后，您需要在单元内设置约束。

检查此帖子：https : //www.hackingwithswift.com/read/32/2/automatically-resizing-uitableviewcells-with-dynamic-type-and-ns

希望能帮助到你）