如何使用按钮标签快速访问自定义单元格的内容? [英] How to access the content of a custom cell in swift using button tag?

问题描述

我有一个应用，在自定义单元格中有一个自定义按钮.如果您选择单元格，它会转到详细视图，这是完美的.如果我在单元格中选择一个按钮，下面的代码会将单元格索引打印到控制台中.

I have an app that has a custom button in a custom cell. If you select the cell it segues to the a detail view, which is perfect. If I select a button in a cell, the code below prints the cell index into the console.

我需要访问所选单元格的内容(使用按钮)并将它们添加到数组或字典中.我是新手，所以很难找到如何访问单元格的内容.我尝试使用 didselectrowatindexpath，但我不知道如何强制索引成为标签的索引...

I need to access the contents of the selected cell (Using the button) and add them to an array or dictionary. I am new to this so struggling to find out how to access the contents of the cell. I tried using didselectrowatindexpath, but I don't know how to force the index to be that of the tag...

所以基本上，如果有 3 个单元格，每个单元格中的 cell.repeatLabel.text 为 'Dog'、'Cat'、'Bird'，然后我选择第 1 行和第 3 行(索引 0 和 2)中的按钮，它应该将 'Dog' 和 'Bird' 添加到数组/字典中.

So basically, if there are 3 cells with 'Dog', 'Cat', 'Bird' as the cell.repeatLabel.text in each cell and I select the buttons in the rows 1 and 3 (Index 0 and 2), it should add 'Dog' and 'Bird' to the array/dictionary.

    // MARK: - Table View

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return postsCollection.count
}

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

    let cell: CustomCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomCell

    // Configure the cell...
    var currentRepeat = postsCollection[indexPath.row]
    cell.repeatLabel?.text = currentRepeat.product
    cell.repeatCount?.text = "Repeat: " + String(currentRepeat.currentrepeat) + " of " + String(currentRepeat.totalrepeat)

    cell.accessoryType = UITableViewCellAccessoryType.DetailDisclosureButton

    cell.checkButton.tag = indexPath.row;

    cell.checkButton.addTarget(self, action: Selector("selectItem:"), forControlEvents: UIControlEvents.TouchUpInside)


    return cell

}

func selectItem(sender:UIButton){

    println("Selected item in row \(sender.tag)")

 }

推荐答案

OPTION 1. 使用委托

处理从单元格子视图触发的事件的正确方法是使用委托.

The right way of handling events fired from your cell's subviews is to use delegation.

因此您可以按照以下步骤操作:

So you can follow the steps:

1. 在您的类定义上方编写一个协议，在您的自定义单元格中使用单个实例方法:

1. Above your class definition write a protocol with a single instance method inside your custom cell:

protocol CustomCellDelegate {
    func cellButtonTapped(cell: CustomCell)
} 

2. 在您的类定义中声明一个委托变量并在委托上调用协议方法:

2. Inside your class definition declare a delegate variable and call the protocol method on the delegate:

var delegate: CustomCellDelegate?

@IBAction func buttonTapped(sender: AnyObject) {
    delegate?.cellButtonTapped(self)
}

3. 符合表视图所在类中的 CustomCellDelegate:

3. Conform to the CustomCellDelegate in the class where your table view is:

 class ViewController: CustomCellDelegate

4.设置单元格的代表

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

    return cell
}

5. 在您的视图控制器类中实现所需的方法.

5. Implement the required method in your view controller class.

首先定义一个空数组，然后像这样修改它:

First define an empty array and then modify it like this:

private var selectedItems = [String]()

func cellButtonTapped(cell: CustomCell) {
    let indexPath = self.tableView.indexPathForRowAtPoint(cell.center)!
    let selectedItem = items[indexPath.row]

    if let selectedItemIndex = find(selectedItems, selectedItem) {
        selectedItems.removeAtIndex(selectedItemIndex)
    } else {
        selectedItems.append(selectedItem)
    }
}

其中 items 是在我的视图控制器中定义的数组:

where items is an array defined in my view controller:

private let items = ["Dog", "Cat", "Elephant", "Fox", "Ant", "Dolphin", "Donkey", "Horse", "Frog", "Cow", "Goose", "Turtle", "Sheep"] 

选项 2. 使用闭包

我决定回来向您展示处理此类情况的另一种方法.在这种情况下使用闭包将减少代码，您将实现目标.

I've decided to come back and show you another way of handling these type of situations. Using a closure in this case will result in less code and you'll achieve your goal.

1. 在您的单元格类中声明一个闭包变量:

1. Declare a closure variable inside your cell class:

var tapped: ((CustomCell) -> Void)?

2. 在按钮处理程序中调用闭包.

2. Invoke the closure inside your button handler.

@IBAction func buttonTapped(sender: AnyObject) {
    tapped?(self)
}

3. 在包含视图控制器类的 tableView(_:cellForRowAtIndexPath:) 中:

3. In tableView(_:cellForRowAtIndexPath:) in the containing view controller class :

let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! CustomCell       
cell.tapped = { [unowned self] (selectedCell) -> Void in
    let path = tableView.indexPathForRowAtPoint(selectedCell.center)!
    let selectedItem = self.items[path.row]

    println("the selected item is \(selectedItem)")
}

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