swift - Swift 创建 Outlet 时 UISwitch 无法正确执行

Question

我有一个 UICollectionViewCell 类，其中包含 UIImageView、UILabel 和 UISwitch 的导出。在 UICollectionViewController 类中，我有一个开关操作

    class CollectionViewController:UICollectionViewController{

     var cell = GridCell()

    @IBAction func stateChanged(sender: UISwitch) {
        var indexPath:NSIndexPath
        indexPath = self.appCollectionView.indexPathForItemAtPoint(self.appCollectionView.convertPoint(sender.center, fromView: sender.superview))!
        print("Index path",indexPath.item)


        if cell.switch.on{
            cell.switch.tintColor = UIColor.blueColor()
            Print("Switch turned on")
        }
        else{

            cell.switch.tintColor = UIColor.redColor()
            cell.switch.layer.cornerRadius = CGFloat(ApplicationConfig.cornerRaduisUISwitch)
            cell.switch.backgroundColor = UIColor.redColor()         
        }

    }
}
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        cell = applianceCollectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! GridCell
        cell.label.text = applianceName[indexPath.row] as String
        cell.image.image = UIImage(named: "ic_notifications_18pt")

        return cell
    }

这是我的 GridCell 类

class GridCell: UICollectionViewCell{

    @IBOutlet weak var image: UIImageView!
    @IBOutlet weak var label: UILabel!

    @IBOutlet weak var switch: UISwitch!
}

当我单击开关时，只有最后一个单元格中的开关执行 switch.on 条件。

所有其他开关即使在打开开关时也会执行 else 条件。

任何帮助将不胜感激。谢谢

Answer 1

您的问题是您正在检查类中的单元格变量是否有打开的开关，而不是检查sender是否打开。对类中单元格变量的最后一个赋值将最终成为 CollectionView 中的最后一个单元格。另一方面，发送者将是被单击的开关。

这是一个例子:

PhotosViewController.swift:

import UIKit

class PhotosViewController: UIViewController {

    @IBOutlet weak var collectionView: UICollectionView!
    let photosDataSource = PhotosDataSource()

    @IBAction func clickedSwitch(sender: UISwitch) {
        let cell = sender.superview!.superview as! PhotoCollectionViewCell
        let labelText = cell.label.text!
        print("\(labelText) - ", terminator: "")

        sender.on ? print("On") : print("Off")
    }

    override func viewDidLoad() {
        collectionView.dataSource = photosDataSource
    }

}

PhotosDataSource.swift:

import UIKit

struct Photo {
    var image: UIImage
    var title: String
}

class PhotosDataSource: NSObject, UICollectionViewDataSource {

    var photos: [Photo] = []

    override init() {
        super.init()

        photos.append(
            Photo(
                image: UIImage(named: "1downarrow")!,
                title: "down arrow"
            )
        )

        photos.append(
            Photo(
                image: UIImage(named: "5_heart")!,
                title: "5 of hearts"
            )
        )

    }

    func collectionView(collectionView: UICollectionView,
        numberOfItemsInSection section: Int)
        -> Int
    {
        return photos.count
    }

    func collectionView(collectionView: UICollectionView,
        cellForItemAtIndexPath indexPath: NSIndexPath)
        -> UICollectionViewCell
    {
        let identifier = "UICollectionViewCell"

        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(identifier, forIndexPath: indexPath) as! PhotoCollectionViewCell

        let photo = photos[indexPath.row]

        cell.imageView.image = photo.image
        cell.label.text = photo.title
        return cell
    }
}

PhotoCollectionViewCell.swift:

import UIKit

class PhotoCollectionViewCell: UICollectionViewCell {

    @IBOutlet var imageView: UIImageView!
    @IBOutlet var label: UILabel!
    @IBOutlet var mySwitch: UISwitch!

}

Assetts.xcassets:

主 Storyboard:

它看起来像这样: