ios UITableViewCell 选中标记在点击时打开和关闭

UITableViewCell checkmark to be toggled on and off when tapped

提问by Jp4Real

I'm working on a tableview

我正在处理一个表格视图

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

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

Now I have some code that makes this work:

现在我有一些代码可以使这个工作：

// 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
        }
    }
}

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

但此代码仅选择一个部分内的 1 个单元格（我有 5 个部分）

I need it to select any cell anywhere

我需要它来选择任何地方的任何单元格

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

此外，当我上下拖动屏幕时，我会丢失复选标记

viewcontroller.swift

视图控制器.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) {




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

}

回答by Roger

Swift > 3.0

斯威夫特 > 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

    }
}

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

我使用两个 Swift 函数解决了这个问题：didSelectRowAtIndexPath 和 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

    }
}

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:

为了使其正常工作，请在您的 cellForRowAtIndexPath 函数中添加一行代码，以便在屏幕上绘制表格视图时选择一行，否则在您第一次选择另一行时不会调用 didDeselectRowAtIndexPath。像这样：

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
}

回答by Dejan Skledar

Try this:

尝试这个：

var checked = [Bool]() // Have an array equal to the number of cells in your table


func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell") as! UITableViewCell

    //configure you cell here.
    if !checked[indexPath.row] {
        cell.accessoryType = .None
    } else if checked[indexPath.row] {
        cell.accessoryType = .Checkmark
    }
    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        if cell.accessoryType == .Checkmark {
             cell.accessoryType = .None
             checked[indexPath.row] = false
        } else {
             cell.accessoryType = .Checkmark
             checked[indexPath.row] = true
        }
    }    
}

To reset all the checkboxes:

要重置所有复选框：

func resetChecks() {
   for i in 0.. < tableView.numberOfSections {
       for j in 0.. < tableView.numberOfRowsInSection(i) {
            if let cell = tableView.cellForRowAtIndexPath(NSIndexPath(forRow: j, inSection: i)) {
               cell.accessoryType = .None
            }
       }
   }
}

回答by n13

A UITableView keeps selected state for single or multiple selections. So IMO there would need to be a very good reason for keeping an entire parallel state somewhere. If you want to just change the cell's appearance based on select state, do it in the cell.

UITableView 为单个或多个选择保持选中状态。因此，IMO 需要有一个很好的理由在某处保持整个并行状态。如果您只想根据选择状态更改单元格的外观，请在单元格中进行。

In your UITableViewCell subclass, override setSelected like so:

在您的 UITableViewCell 子类中，像这样覆盖 setSelected：

override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)
    self.accessoryType = selected ? .checkmark : .none
}

No need to use any table view delegate methods.

无需使用任何表视图委托方法。

Note: You have to call super.setSelected otherwise the cell doesn't keep the selected state correctly.

注意：您必须调用 super.setSelected 否则单元格无法正确保持选定状态。

回答by AnupamChugh

Swift 3.0
Using just one function to keep it simple

Swift 3.0
只使用一个函数来保持简单

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)

    if let cell = tableView.cellForRow(at: indexPath as IndexPath) {
        if cell.accessoryType == .checkmark {
            cell.accessoryType = .none
        } else {
            cell.accessoryType = .checkmark
        }
    }   
}

回答by Wilson

Swift 3.0

斯威夫特 3.0

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if let cell = tableView.cellForRow(at: indexPath) {
        cell.accessoryType = .checkmark
    }
}

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

回答by Brian

Swift 4.0, all together now:

Swift 4.0，现在一起：

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var yourData = ["Cool","Sweet","Awesome"]

var checked = [Bool]()

override func viewDidLoad() {
    super.viewDidLoad()
    checked = Array(repeating: false, count: yourData.count)
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return searchData.count
}
func tableView(_ tableView: UITableView, cellForRowAt IndexPath: IndexPath) -> UITableViewCell {
    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell") as! UITableViewCell

    //configure you cell here.
    if checked[IndexPath.row] == false{
        cell.accessoryType = .none
    } else if checked[IndexPath.row] {
        cell.accessoryType = .checkmark
    }

    return cell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)

    if let cell = tableView.cellForRow(at: indexPath as IndexPath) {
        if cell.accessoryType == .checkmark {
            cell.accessoryType = .none
            checked[indexPath.row] = false
        } else {
            cell.accessoryType = .checkmark
            checked[indexPath.row] = true
        }
    }
}

}

}

回答by Kinergy

Swift 5.0

斯威夫特 5.0

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)

    if let cell = tableView.cellForRow(at: indexPath) {
        resetChecks()
        cell.accessoryType = .checkmark
    }
}

override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    self.tableView.cellForRow(at: indexPath)?.accessoryType = .none
}

func resetChecks() {
    for i in 0..<tableView.numberOfSections {
        for j in 0..<tableView.numberOfRows(inSection: i) {
            if let cell = tableView.cellForRow(at: IndexPath(row: j, section: i)) {
                cell.accessoryType = .none
            }
        }
    }
}

回答by Nish

For Swift 5:

对于 Swift 5：

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if let cell = tableView.cellForRow(at: indexPath as IndexPath) {
        cell.accessoryType = .checkmark
    }

}

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

回答by Wilson Desimini

Since I didn't see anyone list this, you can create a custom UITableViewCellthat will toggle the checkmark with selection by overriding it's setSelected()method and defaulting .selectionStyleto .gray:

由于我没有看到任何人列出这个，您可以创建一个自定义UITableViewCell，通过覆盖它的setSelected()方法并默认.selectionStyle为.gray：

class CheckableTableViewCell: UITableViewCell {

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .gray
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        accessoryType = selected ? .checkmark : .none
    }
}

回答by Javed siddique

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    if self.checkedIndex == indexPath.row{

    }else{
        let cell = tableView.cellForRow(at: indexPath)
        cell?.accessoryType = .checkmark
        let indexPathh = IndexPath(row: checkedIndex, section: 0)
        let UnCheckCell = tableView.cellForRow(at: indexPathh)
        UnCheckCell?.accessoryType = .none
        checkedIndex = indexPath.row
    }
}