Question

我想从自定义UITableViewCell中的按钮执行segue，但是当我按下该按钮时，我不知道如何访问单元格的内容。我意识到这可以通过didSelectRowAtIndexPath来完成，但是我有那个方法执行另一个函数，我想使用我在表格单元格中创建的按钮。

这是我的表演方法，我遇到了问题：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
    if segue.identifier == "showComments"
    {
        let vc:CommentOnPostViewController = segue.destinationViewController as CommentOnPostViewController

        var buttonPosition:CGPoint = sender?.convertPoint(CGPointZero, toView: self.feed) as CGPoint!
        var path:NSIndexPath = self.feed.indexPathForRowAtPoint(buttonPosition) as NSIndexPath!

        var postToCommentOn:PFObject = feedList[path.row] as PFObject
        vc.post = postToCommentOn as PFObject
    }
}

我在显示单元格时标记按钮，然后给它一个目标动作：

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    // There is code that goes here for creating and displaying the cell.

    cell.commentButton.tag = indexPath.row
    cell.commentButton.addTarget(self, action: "addComment", forControlEvents: UIControlEvents.TouchUpInside)
}

以下是按下按钮时调用的操作：

func addComment()
{
    self.performSegueWithIdentifier("showComments", sender: self)
}

感谢任何帮助。谢谢！

Answer 1

使用Method创建一个协议，该协议将由您在TableViewController上定义的CustomCell的Delegate调用

//Pass any objects, params you need to use on the 
//segue call to send to the next controller.

protocol MyCustomCellDelegator {
    func callSegueFromCell(myData dataobject: AnyObject)
}

现在在UITableViewController上使用协议

class MyTableViewController : UITableViewController, MyCustomCellDelegator {


 //The usual Defined methods by UIViewController and UITableViewController 

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

  //Set the CustomCell new Delegate
  var cell = tableView.dequeueReusableCellWithIdentifier(customIdentifier) as MyCustomCell


  cell.delagete = self

  return cell

 }


 //MARK: - MyCustomCellDelegator Methods

 func callSegueFromCell(myData dataobject: AnyObject) {
   //try not to send self, just to avoid retain cycles(depends on how you handle the code on the next controller)
   self.performSegueWithIdentifier("showComments", sender:dataobject )

 }

}

在自定义单元格上定义委托，在新按钮内调用委托功能。

class MyCustomCell : UITableViewCell {

      var delegate:MyCustomCellDelegator!
      @IBOutlet weak var myButton:UIButton



     @IBAction func buttonPressed(sender:AnyObject){
           var mydata = "Anydata you want to send to the next controller"
           if(self.delegate != nil){ //Just to be safe.
             self.delegate.callSegueFromCell(mydata)
           }
    }
}

希望这可以清晰明了，让您在代码中理解和实现。

Answer 2

我找到了一个更快的答案，可以通过动态单元格中的按钮将数据传递给新VC。

设置Tableview，自定义单元格（将单元格与创建的类连接并设置单元格标识符）并创建新VC并通过segue（也为segue设置标识符）将其连接到你当前的TableViewController

使用插座设置单元格（cellButton）

class CustomCell: UITableViewCell {
    @IBOutlet weak var cellButton: UIButton!


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

   override func setSelected(_ selected: Bool, animated: Bool) {
      super.setSelected(selected, animated: animated)
   }
}

TableViewController-Class中的CellForRowAt函数

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
    let cell = tableView.dequeueReusableCell(withIdentifier: "customCell", for: indexPath) as! CustomCell

    //...Do stuff for your cell

    cell.cellButton.tag = indexPath.row //or value whatever you want (must be Int)
    cell.cellButton.addTarget(self, action: #selector(TableViewController.buttonTapped(_:)), for: UIControlEvents.touchUpInside)
 }

设置由按钮目标调用的按钮方法

func buttonTapped(_ sender:UIButton!){
    self.performSegue(withIdentifier: "customSegueIdentifier", sender: sender)
}

准备segue功能

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if(segue.identifier == "customSegueIdentifier") {
        if let destination = segue.destination as? YourNewViewController {

           if let button:UIButton = sender as! UIButton? {
               print(button.tag) //optional
               destination.valueViaSegue = button.tag
           }
        }
    }
}

希望这段代码可以帮助你们。继续编码;）

Answer 3

这就是我所做的

在您的UITableViewCell类中，添加了以下内容

protocol MyCustomCellDelegator {

    func callSegueFromCell(myData dataobject: AnyObject)

}
class MyUITableViewCell: UITableViewCell {

    var delegate:MyCustomCellDelegator!

    .......


    @IBAction func buttonPress (_ sender: Any){


        if(self.delegate != nil){

            self.delegate.callSegueFromCell(myData: )

        }

    }

}

在UITableViewController中

class STVHomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, MyCustomCellDelegator {


    .....

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {


        if let cell = tableView.dequeueReusableCell(withIdentifier: "MyIdentifier") as? MyIdentifierCell {

            // configure your cell
            cell.configureCell(myIdentifier:)

            // This line is important 
            cell.delegate = self

            return cell

        } else {

            return MyIdentifierCell()
        }

    }

    func callSegueFromCell(myData dataobject: AnyObject) {

        print(dataobject)
        self.performSegue(withIdentifier: "goToNextVC", sender: dataobject )


    }

}

从自定义UITableViewCell中的按钮执行segue

3 个答案: