点击时可以打开和关闭UITableViewCell复选标记 [英] UITableViewCell checkmark to be toggled on and off when tapped

问题描述

我正在研究一个tableview

I'm working on a tableview

我希望能够点击每个单元格，当点击时，它会在单元格上显示一个复选标记

I want to be able to tap on each cell and when tapped, it displays a checkmark on the cell

现在我有一些代码可以使这项工作：

Now I have some code that makes this work:

// checkmarks when tapped

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let section = indexPath.section
    let numberOfRows = tableView.numberOfRowsInSection(section)
    for row in 0..<numberOfRows {
        if let cell = tableView.cellForRowAtIndexPath(NSIndexPath(forRow: row, inSection: section)) {
            cell.accessoryType = row == indexPath.row ? .Checkmark : .None
        }
    }
}

但是此代码仅选择一个部分内的1个单元格（我有5个部分）

but this code only selects 1 cell inside a section (I have 5 sections)

我需要它来随处选择任何单元格

I need it to select any cell anywhere

此外，当我上下拖动屏幕时，我会以复选标记输掉

Also when I drag my screen up and down I lose by checkmark

viewcontroller.swift

viewcontroller.swift

class ViewController: UIViewController, UITableViewDataSource {                        //class and subclass                  |)
//---------------------------------------------------------------------------------------------------------------------------/
    // Variable and constant, also IBAOutlet

    let section1 =
       ["this is used",
        "this is used to test",
        "this is used to test the lenght",
        "this is used to test the lenght of the text",
        "this is used to test the lenght of the text",
        "this is used to test the lenght of the text",
        "this is used to test the lenght of the text",
        "this is used to test the lenght of the text",
        "this is used to test the lenght of the text",]
    let section2 =
       ["this is used to test the lenght of the text"]
    let section3 =
       ["this is",
        "this is ",]


    @IBOutlet weak var scoreshow: UILabel!
    @IBOutlet weak var reset: UIButton!
    @IBOutlet weak var tableView: UITableView!

// --------------------------------------------------------------------------------------

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

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()
    }
//----------------------------------------------------------------------------------------
    // checkmarks when tapped

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
    {
        if let cell = tableView.cellForRowAtIndexPath(indexPath) {
            if cell.accessoryType == .Checkmark
            {
                cell.accessoryType = .None
            }
            else
            {
                cell.accessoryType = .Checkmark
            }
        }    
    }
//----------------------------------------------------------------------------------------
    //number of sections for the table

    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 5
    }
//----------------------------------------------------------------------------------------
    //Calculate the amount of rows

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        return self.section1.count;
    }
//----------------------------------------------------------------------------------------
    //Cells text label and config

    func tableView(tableView: UITableView,cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
    {
        let cell:UITableViewCell = UITableViewCell(style:UITableViewCellStyle.Default, reuseIdentifier:"cell")
        cell.textLabel!.text = section1[indexPath.row]
        cell.textLabel!.numberOfLines = 0

        return cell
    }

//----------------------------------------------------------------------------------------

    @IBAction func resetswitch(sender: UIButton) {




    }
//----------------------------------------------------------------------------------------

}

推荐答案

Swift> 3.0

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    if let cell = tableView.cellForRow(at: indexPath) {
        cell.accessoryType = .none
    }
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if let cell = tableView.cellForRow(at: indexPath) {
        cell.accessoryType = .checkmark

    }
}

我使用两个Swift函数解决了：didSelectRowAtIndexPath和didDeselectRowAtIndexPath。

I solved by using two Swift functions: the didSelectRowAtIndexPath and the didDeselectRowAtIndexPath.

override func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        cell.accessoryType = .None
    }
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        cell.accessoryType = .Checkmark

    }
}

使这项工作正确地，在cellForRowAtIndexPath函数中添加一行代码，以便在屏幕上绘制表视图时选择一行，否则didDeselectRowAtIndexPath将不会b e第一次选择另一行时调用。像这样：

To make this work properly, add a line of code to your cellForRowAtIndexPath function to select a row when the table view is drawn on the screen, otherwise the didDeselectRowAtIndexPath will not be called the first time you select another row. Like so:

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cellData", forIndexPath: indexPath) 
    if (some condition to initially checkmark a row)
        cell.accessoryType = .Checkmark
        tableView.selectRowAtIndexPath(indexPath, animated: false, scrollPosition: UITableViewScrollPosition.Bottom)
    } else {
        cell.accessoryType = .None
    }

    return cell
}

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