Question

我正在尝试允许用户在部分的末尾插入行，但是我收到了错误。然而一切似乎都是正确的，所以必须有一些我没有看到的东西。有人能指出我正确的方向。附件是我的代码，错误和表格的截图。

//
//  Test.swift
//  Table Views
//
//  Created by Deion Long on 7/18/15.
//  Copyright (c) 2015 Deion Long. All rights reserved.
//

import UIKit

var array = ["Section 1", "Section 2"]


extension UITableView {
    func indexPathForView (view : UIView) -> NSIndexPath? {
        let location = view.convertPoint(CGPointZero, toView:self)
        return indexPathForRowAtPoint(location)
    }
}
class Test: UIViewController, UITableViewDelegate, UITableViewDataSource {

    var things:NSMutableArray = ["hi", "bye", "kie"]

    @IBAction func editBtnClicked(sender: AnyObject) {

        //When not in editing mode already set editing to true
        if(table.editing == false){
            self.editing = true
            println("hi")
            table.setEditing(true, animated: true)
        }else{
            self.editing = false
            table.setEditing(false, animated: true)
        }
    }

    @IBOutlet weak var table: UITableView!

    @IBAction func doneButton(sender: AnyObject) {
        table.reloadData()

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

        table.allowsSelectionDuringEditing = true



    }
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return array.count // This was put in mainly for my own unit testing
    }
    func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return array[section]
    }
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        var addRow = self.editing ? 1 : 0
        println(addRow)
        return addRow + things.count
    }

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

        let  cell = tableView.dequeueReusableCellWithIdentifier("textInputCell3") as! DetailCell
        if (indexPath.row >= things.count && self.editing) {
             cell.configure(text: "Add Row", placeholder: "Enter")

        } else{
             cell.configure(text: things.objectAtIndex(indexPath.row) as! String, placeholder: "Enter")
        }


        return cell
        }

        override func setEditing(editing: Bool, animated: Bool) {
            super.setEditing(editing, animated: animated)
            self.table.setEditing(editing, animated: animated)

            if(editing){

                table.beginUpdates()
                for var i = 0; i < self.table.numberOfSections(); i++
                {
                    var lastRow = table.numberOfRowsInSection(i)
                    var lastIndex = NSIndexPath(forRow: lastRow, inSection: i)
                    table.insertRowsAtIndexPaths([lastIndex], withRowAnimation: UITableViewRowAnimation.Automatic)
                }
                table.endUpdates()
                }
        }

    func tableView(tableView: UITableView, editingStyleForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCellEditingStyle {
        if(indexPath.row >= things.count){
            return UITableViewCellEditingStyle.Insert

        }else{

            return UITableViewCellEditingStyle.Delete

        }
    }

    func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
        if (editingStyle == UITableViewCellEditingStyle.Delete) {

            things.removeObject(indexPath.row)
            table.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
        }
        else if (editingStyle == UITableViewCellEditingStyle.Insert) {

            things.insertObject("123", atIndex: self.things.count)
            table.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
        }
    }
}

错误：由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'无效更新：第1节中的行数无效。更新后的现有部分中包含的行数（5）必须等于数字在更新（4）之前包含在该部分中的行，加上或减去从该部分插入或删除的行数（0插入，0删除）和加或减移入或移出该部分的行数（0搬进来，0搬出去。'

Answer 1

错误消息说明了一切。在更新模型数据以获得额外行之前，不得插入行。你可能会在这里混淆自己的部分;首先练习一节。您的模型似乎没有很好地区分这两个部分。

Answer 2

在setEditing:中，您在UITableView的beginUpdates和endUpdates函数中插入行

table.beginUpdates()
for var i = 0; i < self.table.numberOfSections(); i++                 {
   var lastRow = table.numberOfRowsInSection(i)
   var lastIndex = NSIndexPath(forRow: lastRow, inSection: i)
   table.insertRowsAtIndexPaths([lastIndex], withRowAnimation: UITableViewRowAnimation.Automatic)
}
table.endUpdates()

插入行时，请确保更新模型对象things。如果您只想重新加载单元格的数据，请使用

table.reloadRowsAtIndexPaths([lastIndex], withRowAnimation: UITableViewRowAnimation.Automatic)

在部分末尾插入行错误

2 个答案: