Deleting a Row from a UITableView in Swift 3?

问题:

I'm new to coding and learning swift, I am following a tutorial for swift 2 and working with swift 3 so there are a few issues I have when following along, this being one I'm properly stuck on.

I have a table of names and i am making a swipe and delete function for them which removes them from a names variable which is an array. I selected the functions which most closely resembled the tutorial inside xcode and filled them out, but my app crashes randomly when I click the delete button. Here is my code for the delete button...

    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {

    let deleteAction = UITableViewRowAction(style: .destructive, title: "Delete") { (rowAction: UITableViewRowAction, indexPath: IndexPath) -> Void in

        print("Deleted")

        self.catNames.remove(at: indexPath.row)
        self.tableView.deleteRows(at: [indexPath], with: UITableViewRowAnimation.automatic)
        self.tableView.reloadData()
    }

回答1:

Works for Swift 3 and Swift 4

Use the UITableViewDataSource tableView(:commit:forRowAt:) method, see also this answer here:

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
  if editingStyle == .delete {
    print("Deleted")

    self.catNames.remove(at: indexPath.row)
    self.tableView.deleteRows(at: [indexPath], with: .automatic)
  }
}

回答2:

First you need to add this function

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
    return true 
}

then your function is ok but no need of tableview reload data just call tableview.beingUpdates and tableview.endUpdates

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
       print("Deleted")
       self.catNames.remove(at: indexPath.row)
       self.tableView.beginUpdates()
       self.tableView.deleteRows(at: [indexPath], with: .automatic)
       self.tableView.endUpdates() 
    }
}

回答3:

In Swift 4 Try This

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }
    func tableView(_ tableView: UITableView, commit editingStyle:   UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        if (editingStyle == .delete) {
            arrStudentName.remove(at: indexPath.row)
            tableView.beginUpdates()
            tableView.deleteRows(at: [indexPath], with: .middle)
            tableView.endUpdates()
        }
    }

回答4:

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {

    if editingStyle == .delete {

        self.animals.remove(at: indexPath.row)

        self.dataDisplayTbleView.reloadData()
    }

}

回答5:

My answer for you

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool
{
     return true
}

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath)
{
    if editingStyle == .delete
    {
        array.remove(at: indexPath.row)
        tblDltRow.reloadData()
    }
}

You need to refresh the table

回答6:

**

for swift 3

**

  func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
      if editingStyle == .delete {
        print("Deleted")

        self.catNames.remove(at: indexPath.row)
        self.tableView.deleteRows(at: [indexPath], with: .automatic)
      }
    }