Question

这个让我很难过，所以希望有人可以提供帮助。我有一个tableview，它有一个带有3个标签和2个按钮的自定义单元格。如果用户点击标签，我使用didSelectRowAtIndexPath从数组设置变量（即variable = array [indexPath.row]），然后执行segue，使用prepareForSegueWithIdentifier将信息从变量传递给新VC - 这很好用一切都很好。

我想在同一个单元格中为按钮实现相同的功能，但是我无法检测哪个行被点击。我已经尝试了一个IBAction来自我第二次编码“func didSelectRowAtIndexPath”的按钮，它有点工作但是行不准确（例如，它会传递一个单元格的信息，而不是我实际挖掘的那个单元格） - 我还尝试了一个全局变量，它将从原始的didSelectRowAtIndexPath函数中获取行，但结果类似。

这样做的最佳做法是什么？还有另一种方法可以从tableView中的第二个位置获取行吗？我应该使用其他标签而不是按钮吗？

非常感谢任何帮助/想法。如果需要，也很乐意发布我的代码。谢谢!!

import UIKit
import Parse

var rowNumber:Int = 0

class FeedTableViewController: UITableViewController {


    var postToWeb:String = ""
    var usernames = [String]()
    var linkArr = [String]()
    var titleArray = [String]()
    var users = [String: String]()
    var createdAt = [String]()
    var userList: [User] = []
    var sortedArticles: [User] = []

    var commentUrl:String = ""
    var commentTitle: String = ""
    var commentUser:String = ""

    struct User {

        var date:NSDate
        var username:String
        var url:String
        var title:String

    }

    let cellSpacingHeight: CGFloat = 10


    class commentButtonClass: UIButton {

        var section:Int = 0


    }

    @IBAction func commentButtonPressed(sender: AnyObject) {

        commentTitle = self.userList[rowNumber].title
        commentUrl = userList[rowNumber].url
        commentUser = (PFUser.currentUser()?.username)!


        performSegueWithIdentifier("commentView", sender: self)

    }


    override func viewDidLoad() {
        super.viewDidLoad()

        var query = PFUser.query()

        query?.orderBySortDescriptor(NSSortDescriptor(key: "createdAt", ascending: false))

        query?.findObjectsInBackgroundWithBlock({ (objects, error) in

            if let users = objects {

                self.usernames.removeAll(keepCapacity: true)
                self.linkArr.removeAll(keepCapacity:  true)
                self.titleArray.removeAll(keepCapacity: true)
                self.createdAt.removeAll(keepCapacity: true)

                for object in users {

                    if let user = object as? PFUser {

                        self.users[user.objectId!] = user.username!

                    }

                }

            }



        let getFollowedUsersQuery = PFQuery(className: "followers")


        getFollowedUsersQuery.whereKey("follower", equalTo: PFUser.currentUser()!.objectId!)

        getFollowedUsersQuery.orderBySortDescriptor(NSSortDescriptor(key: "createdAt", ascending: false))

        getFollowedUsersQuery.findObjectsInBackgroundWithBlock { (objects, error) in

            if let objects = objects {

                for object in objects {

                    let followedUser = object["following"] as! String

                    let query = PFQuery(className: "posts")

                    query.whereKey("userId", equalTo: followedUser)

                    query.orderBySortDescriptor(NSSortDescriptor(key: "createdAt", ascending: false))

                    query.findObjectsInBackgroundWithBlock({ (objects, error) in

                        //create a struct with createdAt as struct name since will be unique majority of time if include time and date.

                        if let objects = objects {


                            for object in objects {

                                let dateFormatter = NSDateFormatter()
                                dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle
                                dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle
                                let dateString = dateFormatter.stringFromDate(object.createdAt!)

                                self.userList.append(User(date: object.createdAt!, username:self.users[object["userId"] as! String]!, url: object["linkURL"] as! String, title: object["title"] as! String))

                                self.userList.sortInPlace{ $0.date.compare($1.date) == NSComparisonResult.OrderedDescending  }

                                self.tableView.reloadData()

                            }

                        }

                    })

                }

            }

        }

        })




    }


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

    // Set the spacing between sections
    override func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return cellSpacingHeight
    }

    // Make the background color show through
    override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let headerView = UIView()
        headerView.backgroundColor = UIColor.clearColor()
        return headerView
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return userList.count
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 1
    }


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

        let dateFormatter = NSDateFormatter()
        dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle
        dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle
        let dateString = dateFormatter.stringFromDate(self.userList[indexPath.section].date)

        myCell.titleLabel.text = self.userList[indexPath.section].title

        myCell.userLabel.text = self.userList[indexPath.section].username

        myCell.createdDateLabel.text = dateString

        myCell.rowNumberLabel.tag = indexPath.section

        // add border and color

        myCell.backgroundColor = UIColor.whiteColor()
        myCell.layer.borderColor = UIColor.clearColor().CGColor
        myCell.layer.borderWidth = 2
        myCell.layer.cornerRadius = 0
        myCell.clipsToBounds = true


        return myCell
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        let currentCell = tableView.cellForRowAtIndexPath(indexPath) as UITableViewCell!;

        rowNumber = indexPath.section

        postToWeb = userList[indexPath.section].url

        print(postToWeb)

        performSegueWithIdentifier("webView", sender: self)

    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

        if (segue.identifier == "webView") {

            // initialize new view controller and cast it as your view controller

            let vc = segue.destinationViewController as! WebViewController

            // your new view controller should have property that will store passed value

            vc.passedValue = postToWeb

        }
        if (segue.identifier == "commentView") {

            let commentVc = segue.destinationViewController as! commentsViewController

            commentVc.passedCommentTitle = commentTitle
            commentVc.passedCommentUrl = commentUrl
            commentVc.passedCommentUsername = commentUser

        }
    }

在上面，“webView”的segue工作正常，数据通过。在commentView中 - 传递数据，但它不正确。

Answer 1

这样做的最佳做法是什么？

你需要委托模式。见下面的例子。

CustomTableViewCell类：

protocol CustomTableViewCellDelegate {
    func customTableViewCell(cell: CustomTableViewCell, didTextInLabelChanged text: String)
}

class CustomTableViewCell: UITableViewCell {

    var delegate: CustomTableViewCellDelegate?

    func handeLabelTextChanged(text: String) {
        delegate?.customTableViewCell!(self, didTextInLabelChanged: text)
    }

    // ... some other code

}

CustomViewController类：

class CustomViewController {

    // some code

}

class CustomViewController: UITableViewDataSource {

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        let cell = // dequeue the right cell
        cell.delegate = self
        return cell

    }

}

class CustomViewController: CustomTableViewCellDelegate {

    func customTableViewCell(cell: CustomTableViewCell, didTextInLabelChanged text: String) {
        // do tableView update with changed text
    }

}

当你看到所有“改变”（或“窃听”或其他）逻辑正在你的单元格中进行时。要通知控制器有关此更改的信息，您只需使用所有方法创建一个协议（在这种情况下，我通知我的控制器有关标签中的文本已更改），然后您需要创建一个var delegate: YourDelegate?并在需要的地方调用它。下一步，您需要在控制器中实现“句柄”功能。这很简单。您只需要实施customTableViewCell()中的CustomTableViewCellDelegate功能，并将delegate变量设置为self CustomTableViewCell。

<强>更新

当用户点击单元格内的按钮时，我需要来自该单元格的特定信息，基于indexPath.row

很简单。请记住，在您的控制器中，您实现了CustomTableViewCellDelegate？因此，要从单元格中获取特定信息，您可以执行以下操作：

class CustomViewController: CustomTableViewCellDelegate {

    func customTableViewCell(cell: CustomTableViewCell, didTextInLabelChanged text: String) {

        // here you get `someVariable` from your cell.
        // where `someVariable` you set in the `cellForRowAtIndexPath` controller's
        // method
        let info = cell.someVariable

        // or, if for some reason you not save in your cell some data,
        // but you need the `indexPath.row` to get this data you 
        // can find this `indexPath` like this:
        if let indexPath = tableView.indexPathForCell(cell) {
            let number = youArrayOfNumbers[indexPath.row]
        }

    }

}

Answer 2

要获取被点击的UITableViewCell（作为按钮的动作），您有不同的选择：

1）使用Target-Action方法，例如：

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let myCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! cell
    //...More Code

    myCell.myBtn.addTarget(self, action: "myActionMethod:", forControlEvents: .TouchUpInside)

    //... More Code

    return myCell
}

然后定义您的操作方法（注意， yourTbl 是 UITableView 的实例）：

func myActionMethod(sender:UIButton){
    //base on the hierarchy of the UI
    //Suppose in this case:
    //(UITableView)->(UITableViewCell)->(ContentView)->UIButton then:
    if let tableViewCell = sender.superview?.superview as? UITableViewCell, indexPath = yourTbl.indexPathForCell(tableViewCell){
        //Here you have the IndexPath
    }
}

2）相同的想法，但基本上你要设置UIButton的Tag属性（到您的行单元格），并使用发送者（参数）上的Target-Action获得按钮的标记。

更新示例： https://github.com/Abreu0101/SampleTargetActionMethod

检测tableViewCell的不同区域中的分路器

2 个答案: