Ios 更新UICollectionView中的标签

当我单击

Add（+）

或

Remove（-）

按钮时，我使用UICollectionView创建了这个标签，然后我想更新标签。我怎样才能做到这一点

MainViewController.swift

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    if(collectionView == ProductCollectionView){
        let Productcell = self.ProductCollectionView.dequeueReusableCell(withReuseIdentifier:"ProductCollectionViewCell", for: indexPath) as! ProductCollectionViewCell

        Productcell.AddOrMinusLabel.text = "\(bestOfferProductCount[indexPath.row])"
        Productcell.ProdName.text = bestOfferProductName[indexPath.row]
        Productcell.ProdPrice.text = bestOfferProductPrice[indexPath.row]
        Productcell.ProdtOrgPrice.text = bestOfferProductOriginalPrice[indexPath.row]
        Productcell.ProdWeight.text = bestOfferProductWeight[indexPath.row]+" "+bestOfferProductUnit[indexPath.row]
        Productcell.ProductImage.setImageFromURl(stringImageUrl: bestOfferProductImage[indexPath.row])

        return Productcell
    }

}

import UIKit

class ProductCollectionViewCell: UICollectionViewCell {

@IBOutlet weak var ProdPrice: UILabel!
@IBOutlet weak var ProdtOrgPrice: UILabel!
@IBOutlet weak var ProductImage: UIImageView!
@IBOutlet weak var ProdName: UILabel!
@IBOutlet weak var ProdWeight: UILabel!

}

ProductCollectionViewCell.swift

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    if(collectionView == ProductCollectionView){
        let Productcell = self.ProductCollectionView.dequeueReusableCell(withReuseIdentifier:"ProductCollectionViewCell", for: indexPath) as! ProductCollectionViewCell

        Productcell.AddOrMinusLabel.text = "\(bestOfferProductCount[indexPath.row])"
        Productcell.ProdName.text = bestOfferProductName[indexPath.row]
        Productcell.ProdPrice.text = bestOfferProductPrice[indexPath.row]
        Productcell.ProdtOrgPrice.text = bestOfferProductOriginalPrice[indexPath.row]
        Productcell.ProdWeight.text = bestOfferProductWeight[indexPath.row]+" "+bestOfferProductUnit[indexPath.row]
        Productcell.ProductImage.setImageFromURl(stringImageUrl: bestOfferProductImage[indexPath.row])

        return Productcell
    }

}

import UIKit

class ProductCollectionViewCell: UICollectionViewCell {

@IBOutlet weak var ProdPrice: UILabel!
@IBOutlet weak var ProdtOrgPrice: UILabel!
@IBOutlet weak var ProductImage: UIImageView!
@IBOutlet weak var ProdName: UILabel!
@IBOutlet weak var ProdWeight: UILabel!

}

---

有多种方法可以做到这一点

1.旧的委托机制 当您将单元格出列时，必须删除AllObserver，然后将目标从单元格添加到您的ViewController，以获取带发送方正负号的TapeEvents。在被调用方方法中，必须获取其superView（直到到达collectionViewCell视图），然后从UICollectionView请求该单元格的itemIndex，并相应地更新视图、单元格和模型

class CustomCell: UICollectionCell {
    var plusAction: (() -> Void)?
    var minusAction: (() -> Void)?
    @IBOutlet var counterLabel: UILabel!

    @IBAction plusTapped() {
        plusAction?()
    }

    @IBAction minusTapped() {
        minusAction?()
    }
}

2.使用闭包 您可以在单元格中定义两个闭包，一个用于加号，一个用于减号，而不是将目标添加到viewController，将目标添加到单元格并调用相应的闭包，每次尝试返回单元格时，设置这些闭包并相应地对其执行操作

class CustomCell: UICollectionCell {
    var plusAction: (() -> Void)?
    var minusAction: (() -> Void)?
    @IBOutlet var counterLabel: UILabel!

    @IBAction plusTapped() {
        plusAction?()
    }

    @IBAction minusTapped() {
        minusAction?()
    }
}

在cellDequeue方法中：

cellForItemAtIndexPath(/*...other parameters...*/) -> UICollectionCell {
    let cell = collectionView.dequeueCell(/*...other parameters...*/) as! CustomCell
    // other customizations
    // weak allocation in closure might not be needed here since closure reference is nullable on the other end, but i wrote it just in-case.
    cell.plusAction = { [weak weakCell = cell] in
        let counter = 0 // i said 0 for ex, You actually have to have them stored somewhere (even initial zeros) and fetch the actual value for this indexPath
        let newCounter = counter + 1
        // update your Model with newCounter
        weakCell?.counterLabel.text = "\(newCounter)"
    }

    cell.minusAction = { [weak weakCell = cell] in
        let counter = 0 // i said 0 for ex, You actually have to have them stored somewhere (even initial zeros) and fetch the actual value for this indexPath
        let newCounter = counter - 1
        // update your Model with newCounter
        weakCell?.counterLabel.text = "\(newCounter)"
    }
}

---

有多种方法可以做到这一点

1.旧的委托机制 当您将单元格出列时，必须删除AllObserver，然后将目标从单元格添加到您的ViewController，以获取带发送方正负号的TapeEvents。在被调用方方法中，必须获取其superView（直到到达collectionViewCell视图），然后从UICollectionView请求该单元格的itemIndex，并相应地更新视图、单元格和模型

class CustomCell: UICollectionCell {
    var plusAction: (() -> Void)?
    var minusAction: (() -> Void)?
    @IBOutlet var counterLabel: UILabel!

    @IBAction plusTapped() {
        plusAction?()
    }

    @IBAction minusTapped() {
        minusAction?()
    }
}

2.使用闭包 您可以在单元格中定义两个闭包，一个用于加号，一个用于减号，而不是将目标添加到viewController，将目标添加到单元格并调用相应的闭包，每次尝试返回单元格时，设置这些闭包并相应地对其执行操作

class CustomCell: UICollectionCell {
    var plusAction: (() -> Void)?
    var minusAction: (() -> Void)?
    @IBOutlet var counterLabel: UILabel!

    @IBAction plusTapped() {
        plusAction?()
    }

    @IBAction minusTapped() {
        minusAction?()
    }
}

在cellDequeue方法中：

cellForItemAtIndexPath(/*...other parameters...*/) -> UICollectionCell {
    let cell = collectionView.dequeueCell(/*...other parameters...*/) as! CustomCell
    // other customizations
    // weak allocation in closure might not be needed here since closure reference is nullable on the other end, but i wrote it just in-case.
    cell.plusAction = { [weak weakCell = cell] in
        let counter = 0 // i said 0 for ex, You actually have to have them stored somewhere (even initial zeros) and fetch the actual value for this indexPath
        let newCounter = counter + 1
        // update your Model with newCounter
        weakCell?.counterLabel.text = "\(newCounter)"
    }

    cell.minusAction = { [weak weakCell = cell] in
        let counter = 0 // i said 0 for ex, You actually have to have them stored somewhere (even initial zeros) and fetch the actual value for this indexPath
        let newCounter = counter - 1
        // update your Model with newCounter
        weakCell?.counterLabel.text = "\(newCounter)"
    }
}

---

我说，总是在cell类中配置您的cell数据

import UIKit

class ProductCollectionViewCell: UICollectionViewCell {
@IBOutlet weak var addOrMinusLabel: UILabel!
@IBOutlet weak var ProdPrice: UILabel!
@IBOutlet weak var ProdtOrgPrice: UILabel!
@IBOutlet weak var ProductImage: UIImageView!
@IBOutlet weak var ProdName: UILabel!
@IBOutlet weak var ProdWeight: UILabel!

var count = 1 {
    didSet{
        self.addOrMinusLabel.text = "\(count)"
    }
}


 func configureData(count: Int) {
    self.count = count
}

@IBAction func subtract(_ sender: UIButton) {
    self.count -= 1

}
@IBAction func add(_ sender: UIButton) {
    self.count += 1
}

}

在您的视图控制器中

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

if(collectionView == ProductCollectionView){
    let Productcell = self.ProductCollectionView.dequeueReusableCell(withReuseIdentifier:"ProductCollectionViewCell", for: indexPath) as! ProductCollectionViewCell
    Productcell.configureData(count: (bestOfferProductCount[indexPath.row]))

   // do try to configure these below labels also within cell class 
    Productcell.ProdName.text = bestOfferProductName[indexPath.row]
    Productcell.ProdPrice.text = bestOfferProductPrice[indexPath.row]
    Productcell.ProdtOrgPrice.text = bestOfferProductOriginalPrice[indexPath.row]
    Productcell.ProdWeight.text = bestOfferProductWeight[indexPath.row]+" "+bestOfferProductUnit[indexPath.row]
    Productcell.ProductImage.setImageFromURl(stringImageUrl: bestOfferProductImage[indexPath.row])

    return Productcell
}

}

---

我说，总是在cell类中配置您的cell数据

import UIKit

class ProductCollectionViewCell: UICollectionViewCell {
@IBOutlet weak var addOrMinusLabel: UILabel!
@IBOutlet weak var ProdPrice: UILabel!
@IBOutlet weak var ProdtOrgPrice: UILabel!
@IBOutlet weak var ProductImage: UIImageView!
@IBOutlet weak var ProdName: UILabel!
@IBOutlet weak var ProdWeight: UILabel!

var count = 1 {
    didSet{
        self.addOrMinusLabel.text = "\(count)"
    }
}


 func configureData(count: Int) {
    self.count = count
}

@IBAction func subtract(_ sender: UIButton) {
    self.count -= 1

}
@IBAction func add(_ sender: UIButton) {
    self.count += 1
}

}

在您的视图控制器中

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

if(collectionView == ProductCollectionView){
    let Productcell = self.ProductCollectionView.dequeueReusableCell(withReuseIdentifier:"ProductCollectionViewCell", for: indexPath) as! ProductCollectionViewCell
    Productcell.configureData(count: (bestOfferProductCount[indexPath.row]))

   // do try to configure these below labels also within cell class 
    Productcell.ProdName.text = bestOfferProductName[indexPath.row]
    Productcell.ProdPrice.text = bestOfferProductPrice[indexPath.row]
    Productcell.ProdtOrgPrice.text = bestOfferProductOriginalPrice[indexPath.row]
    Productcell.ProdWeight.text = bestOfferProductWeight[indexPath.row]+" "+bestOfferProductUnit[indexPath.row]
    Productcell.ProductImage.setImageFromURl(stringImageUrl: bestOfferProductImage[indexPath.row])

    return Productcell
}

}

---

试试这个简单的，清醒的

将此代码添加到

viewcontroller

@IBAction func onBtnPlusClick(_ sender : UIButton) {
    if let cell = sender.superview?.superview as? ProductCollectionViewCell {
        let indexPath = yourCollectionViewOutlet.indexPath(for: cell)
    //Do whatever you want or update your data model values
         yourCollectionViewOutlet.reloadData()
    }
}

@IBAction func onBtnMinusClick(_ sender : UIButton) {
        if let cell = sender.superview?.superview as? ProductCollectionViewCell {
            let indexPath = yourCollectionViewOutlet.indexPath(for: cell)
        //Do whatever you want or update your data model values
         yourCollectionViewOutlet.reloadData()
        }
    }

在您的

cellForItemAt

addtargetto按钮中

btnPlus.addTarget(self, action: #selector(self. onBtnPlusClick(_:)), for: .touchUpInside) 
btnMinus.addTarget(self, action: #selector(self. onBtnPlusClick(_:)), for: .touchUpInside) 

在

ProductCollectionViewCell

class中添加两个按钮插座

@IBOutlet var btnPlus : UIButton!
@IBOutlet var btnMinus : UIButton!

---

就这样，希望这有帮助

试试这个简单的n清醒

将此代码添加到

viewcontroller

@IBAction func onBtnPlusClick(_ sender : UIButton) {
    if let cell = sender.superview?.superview as? ProductCollectionViewCell {
        let indexPath = yourCollectionViewOutlet.indexPath(for: cell)
    //Do whatever you want or update your data model values
         yourCollectionViewOutlet.reloadData()
    }
}

@IBAction func onBtnMinusClick(_ sender : UIButton) {
        if let cell = sender.superview?.superview as? ProductCollectionViewCell {
            let indexPath = yourCollectionViewOutlet.indexPath(for: cell)
        //Do whatever you want or update your data model values
         yourCollectionViewOutlet.reloadData()
        }
    }

在您的

cellForItemAt

addtargetto按钮中

btnPlus.addTarget(self, action: #selector(self. onBtnPlusClick(_:)), for: .touchUpInside) 
btnMinus.addTarget(self, action: #selector(self. onBtnPlusClick(_:)), for: .touchUpInside) 

在

ProductCollectionViewCell

class中添加两个按钮插座

@IBOutlet var btnPlus : UIButton!
@IBOutlet var btnMinus : UIButton!

---

就是这样，希望这有助于我使用协议， 将其添加到单元格的类中，并将iAction添加到UIButton中

class ProductCollectionViewCell: UICollectionViewCell {

  @IBOutlet weak var ProdPrice: UILabel!
  @IBOutlet weak var ProdtOrgPrice: UILabel!
  @IBOutlet weak var ProductImage: UIImageView!
  @IBOutlet weak var ProdName: UILabel!
  @IBOutlet weak var ProdWeight: UILabel!

  weak open var delegate: ProductCollectionViewCellDelegate?

  @IBAction func btnIncrement(_ sender: UIButton)
  {
    if let d = self.delegate {
      d.didTapOnIncrement(cell: self)
    }
  }

  @IBAction func btnDecrement(_ sender: UIButton)
  {
    if let d = self.delegate {
      d.didTapOnDecrement(cell: self)
    }
  }
}

protocol ProductCollectionViewCellDelegate: NSObjectProtocol {
    func didTapOnIncrement(cell: ProductCollectionViewCell)
    func didTapOnDecrement(cell: ProductCollectionViewCell)
}

现在在cellForItemAt方法中，添加以下行-\

cell.delegate = self

现在确认学员确认协议。在本例中，我假设它是您的viewController

extension ViewController: ProductCollectionViewCellDelegate {

  func didTapOnIncrement(cell: ProductCollectionViewCell) {
    //let indexPath = self.tableView.indexPath(for: cell)
    //You have the cell's instance here. You can also get the indexPath by delegate method.
    //You can add the increment-decrement logic here.
  }

  func didTapOnDecrement(cell: ProductCollectionViewCell) {
    //let indexPath = self.tableView.indexPath(for: cell)
    //You have the cell's instance here. You can also get the indexPath by delegate method.
    //You can add the increment-decrement logic here.
  }

}

---

我会使用协议来做这件事， 将其添加到单元格的类中，并将iAction添加到UIButton中

class ProductCollectionViewCell: UICollectionViewCell {

  @IBOutlet weak var ProdPrice: UILabel!
  @IBOutlet weak var ProdtOrgPrice: UILabel!
  @IBOutlet weak var ProductImage: UIImageView!
  @IBOutlet weak var ProdName: UILabel!
  @IBOutlet weak var ProdWeight: UILabel!

  weak open var delegate: ProductCollectionViewCellDelegate?

  @IBAction func btnIncrement(_ sender: UIButton)
  {
    if let d = self.delegate {
      d.didTapOnIncrement(cell: self)
    }
  }

  @IBAction func btnDecrement(_ sender: UIButton)
  {
    if let d = self.delegate {
      d.didTapOnDecrement(cell: self)
    }
  }
}

protocol ProductCollectionViewCellDelegate: NSObjectProtocol {
    func didTapOnIncrement(cell: ProductCollectionViewCell)
    func didTapOnDecrement(cell: ProductCollectionViewCell)
}

现在在cellForItemAt方法中，添加以下行-\

cell.delegate = self

现在确认学员确认协议。在本例中，我假设它是您的viewController

extension ViewController: ProductCollectionViewCellDelegate {

  func didTapOnIncrement(cell: ProductCollectionViewCell) {
    //let indexPath = self.tableView.indexPath(for: cell)
    //You have the cell's instance here. You can also get the indexPath by delegate method.
    //You can add the increment-decrement logic here.
  }

  func didTapOnDecrement(cell: ProductCollectionViewCell) {
    //let indexPath = self.tableView.indexPath(for: cell)
    //You have the cell's instance here. You can also get the indexPath by delegate method.
    //You can add the increment-decrement logic here.
  }

}

---

使用多个阵列作为数据源是一种可怕的设计。1） 将类用作模型2）将

cellForRow

中的模型项传递给单元格3）在单元格中执行

iAction

s，同时进行更改和更新模型。请遵守变量名以小写字母开头的命名约定。我刚刚实现了在collectionView中显示数据。我也不知道该怎么办。只是在寻找解决办法。我没有得到任何与此相关的解决方案。我是ios的初学者development@vadian谢谢我明白你的意思。但是，如果我想添加或删除产品数量，并通过单击+或-按钮向标签显示如何添加或删除产品数量，请查看我之前评论中的3）。如果你有对数据模型的引用，你可以在单元格中做任何事情，假设你保持模型同步。就我个人而言，我不希望单元格直接更新模型。让计算单元实现一个委托协议，以便它可以通知视图控制器+/-点击，然后视图控制器可以更新模型并刷新项目。使用多个数组作为数据源是一个可怕的设计。1） 将类用作模型2）将

cellForRow

中的模型项传递给单元格3）在单元格中执行

iAction

s，同时进行更改和更新模型。请遵守变量名以小写字母开头的命名约定。我刚刚实现了在collectionView中显示数据。我也不知道该怎么办。只是在寻找解决办法。我没有得到任何与此相关的解决方案。我是ios的初学者development@vadian谢谢我明白你的意思。但是，如果我想添加或删除产品数量，并通过单击+或-按钮向标签显示如何添加或删除产品数量，请查看我之前评论中的3）。如果你有对数据模型的引用，你可以在单元格中做任何事情，假设你保持模型同步。就我个人而言，我不希望单元格直接更新模型。让计算单元实现委派协议，以便它可以将+/-点击通知视图控制器，然后视图控制器可以更新模型并刷新项目。