从自定义UITableViewCell中的按钮执行segue

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.

这是我的执行segue方法我遇到了麻烦:

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,并给它一个目标动作:

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)
}

任何帮助表示赞赏.谢谢!

Answer 1

使用Method创建一个Protocol,它将由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Protocol

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

我找到了一个更快捷的答案，可以使用动态单元格中的按钮将数据传递给新的 VC。

1. 设置一个 Tableview、一个自定义单元格（将单元格与您创建的类连接并设置单元格标识符）并创建一个新的 VC 并通过 segue（还为 segue 设置标识符）将其连接到当前的 TableViewController

2. 使用插座 (cellButton) 设置您的单元

   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)
      }
   }
   

3. TableViewController 类中的 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)
    }
   

4. 设置由按钮目标调用的按钮方法

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

5. 准备 segue 函数

   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
              }
           }
       }
   }
   

希望这段代码对你们有帮助。继续编码；）