iOS在TableView单元格中快速显示UIButton

Question

I have a tableView with custom cell. in my custom cell I have a like button. for like Button I wrote a function to change state from .normal to .selected like this:

FeedViewCell

class FeedViewCell: UITableViewCell {
@IBOutlet weak var likeButton: UIButton!


var likes : Bool {
    get {
        return UserDefaults.standard.bool(forKey: "likes")
    }
    set {
        UserDefaults.standard.set(newValue, forKey: "likes")
    }
}
override func awakeFromNib() {
    super.awakeFromNib()
    self.likeButton.setImage(UIImage(named: "like-btn-active"), for: .selected)
}

override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
}

@IBAction func likeBtnTouch(_ sender: AnyObject) {

    print("press")
    // toggle the likes state
    self.likes = !self.likeButton.isSelected
    // set the likes button accordingly
    self.likeButton.isSelected = self.likes
 }
}

FeedViewController :

class FeedViewController: UIViewController {
@IBOutlet var feedTableView: UITableView!

override func viewDidLoad() {

    super.viewDidLoad()

    // Register Cell Identifier
    let feedNib = UINib(nibName: "FeedViewCell", bundle: nil)
    self.feedTableView.register(feedNib, forCellReuseIdentifier: "FeedCell")
}

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

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.feeds.count
}

func tableView(_ tableView: UITableView, heightForRowAtIndexPath indexPath: IndexPath) -> CGFloat {

    return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "FeedCell", for: indexPath) as! FeedViewCell

   return cell
 }
}

But my problem is when I tap like button in cell with indexPath.row 0 the state of button in cell with indexPath.row 3 change state too.

where is my mistake?

thanks

Answer 1

您并未发布所有代码，但我可以告诉您，要使其正常工作， @IBAction func likeBtnTouch(_ sender: AnyObject) { }定义必须位于FeedViewCell类定义内，以使其对于特定的实例是唯一的。细胞。

Answer 2

As a rule of thumb, I normally ensure that all the UI elements inside my cell are populated in cellForRowAtIndexPath when using dequeued cells. Also it should be set from an external source. Iow not from a property inside the cell. Dequeuing cells reuse them, and if not setup properly, it might have some leftovers from another cell.

For example, inside cellForRowAtIndexPath:

self.likeButton.isSelected = likeData[indexPath.row]