CollectionView reloadData怪异的行为

如何解决CollectionView reloadData怪异的行为

我想用单元格制作一个集合视图,您可以在其中选择我的小游戏的颜色。因此,您可以在不同主题之间进行选择(每个主题在一个单元格中)。如果解锁了主题(通过获得分数),则模糊视图和锁定图标应消失,并且所有可用的单元格/主题都应该是可选的。我这样实现:

(集合ViewController类:)

    import UIKit
import PMSuperButton

class myCollectionViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource {

    @IBOutlet weak var backBtn: UIButton!
    
    let items = ["Default dot","Trap your first dot","Score 15 or less (classic)","Score 5 or less (classic)","Score 15 or less (hard)","Score 25 or less (no chill)","Score 15 or less (snake)","Score 15 or less everywhere","Score 10 or less everywhere","Circle the dot 100 times","10"]
    var preSelected = IndexPath()
    
    @IBOutlet weak var myCollectionView: UICollectionView!
    override func viewDidLoad() {
        super.viewDidLoad()
        updateUnlockedString()
        updateColor()
    }
    
    func updateColor(){
        view.backgroundColor = myColors().selected(value: selectedInstance.selectedColor).backgroundColor
    }
    func   updateUnlockedString(){
        let easyHS = UserDefaults.standard.integer(forKey: "highscoreeasy")
        let classicHS = UserDefaults.standard.integer(forKey: "highscoreclassic")
        let hardHS = UserDefaults.standard.integer(forKey: "highscorehard")
        let nochillHS = UserDefaults.standard.integer(forKey: "highscoreno chill")
        let snakeHS = UserDefaults.standard.integer(forKey: "highscoresnake")
        
        var unlockedString = ""
        
        //unimportant steps deleted

        UserDefaults.standard.set(unlockedString,forKey: "unlocked")
        
    }

    func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
        return items.count
    }
    
    func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell",for: indexPath) as! myCollectionViewCell
        if(unlockInstance.unlockedString.contains(String(indexPath.item))){
            cell.unlockedEffect()
            print("unlocked Effect")
        }
        cell.label.text = items[indexPath.item]
        cell.removeHighlight()
        if indexPath.item == selectedInstance.selectedColor{
             cell.highlightEffect()
             preSelected = IndexPath(item: indexPath.item,section: indexPath.section)
         }
        cell.setupCellFilling(playerColor: myColors().selected(value: indexPath.item).playerColor,objColor: myColors().selected(value: indexPath.item).objColor,defaultColor: myColors().selected(value: indexPath.item).defaultColor,backgroundColor: myColors().selected(value: indexPath.item).backgroundColor)
         myCollectionView = collectionView
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
        collectionView.allowsMultipleSelection = false
        if ((collectionView.cellForItem(at: indexPath) as! myCollectionViewCell?) != nil) && unlockInstance.unlockedString.contains(String(indexPath.item)){
            selectedInstance.selectedColor = indexPath.item
            updateColor()
            collectionView.reloadData()
        }
    }
    @IBAction func backPressed(_ sender: Any) {
        cameInstance.came = true
    }
    
}

(集合CELL类:)

    import UIKit

class myCollectionViewCell: UICollectionViewCell {
    
    @IBOutlet weak var label: UILabel!
    @IBOutlet weak var view: UIView!
    @IBOutlet weak var blurView: UIVisualEffectView!
    @IBOutlet weak var lockedBlur: UIVisualEffectView!
    @IBOutlet weak var lockedIcon: UIImageView!

    override func layoutSubviews() {
        // cell rounded section
        self.layer.cornerRadius = 15.0
        self.layer.masksToBounds = true
        
        // cell shadow section
        self.contentView.layer.cornerRadius = 15.0
        self.contentView.layer.masksToBounds = true
        self.layer.shadowColor = myColors().selected(value: selectedInstance.selectedColor).defaultColor.cgColor
        self.layer.shadowOffset = CGSize(width: 0.0,height: 0.0)
        self.layer.shadowRadius = 6.0
        self.layer.shadowOpacity = 0.4
        self.layer.cornerRadius = 15.0
        self.layer.masksToBounds = false
        self.layer.shadowPath = UIBezierPath(roundedRect: self.bounds,cornerRadius: self.contentView.layer.cornerRadius).cgPath
        super.layoutSubviews()
    }
   

extension myCollectionViewCell{

   func highlightEffect(){
      self.layer.borderWidth = 5.0
      self.layer.borderColor = UIColor.systemGreen.cgColor
   }

   func removeHighlight(){
      self.layer.borderColor = UIColor.clear.cgColor
   }
    func unlockedEffect(){
        lockedBlur.alpha = 0
        lockedIcon.alpha = 0
    }
    func setupCellFilling(playerColor: UIColor,objColor: UIColor,defaultColor: UIColor,backgroundColor: UIColor){
        
        lockedBlur.effect = UIBlurEffect(style: .extraLight)
        blurView.effect = UIBlurEffect(style: .systemUltraThinMaterialDark)
        lockedIcon.tintColor = objColor
        view.backgroundColor = backgroundColor
  
    }

}

问题

当我打开CollectionView(viewDidLoad)时,一切看起来都100%正常!应该被锁定的所有单元格都显示为锁定(lockedBlur.alpha = 0和lockedIcon.alpha = 0)。此外,只有锁定的单元格是可选择的,我可以看到带有绿色边框。只有选定的单元格具有绿色边框,就是这样。

但是:当我选择一个单元格时,一些随机锁定的单元格会松开其模糊视图并松开其锁定图标(因此,blockedBlur和lockedIcon消失了)。它们仍然是不可选择的。有时这会影响所有细胞,有时只影响2。

当我选择一个单元格时,didSelectItemAt函数会被调用。而且这也调用updateColors(),后者仅更改背景并调用神秘的reloadData()。在我看来,reloadData()可以使LockedBlur和LockedIcon消失,而我找不到原因...。

也许有人可以帮助我。

谢谢!

SwiftHobby

解决方法

我正在研究Fitness App,它的训练计划部分具有非常相似的CollectionView行为。基本上,您在完成运动后选择某些单元格。因此,我在实现选择和取消选择单元格的方法上做了很多工作。如我所见,您缺少选择和取消选择CollectionViewDelegate的功能。在那里您设置了不同的状态效果

这是您必须使用的功能:

func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
    if let cell = collectionView.cellForItem(at: indexPath) as? CustomCollectionViewCell {
        cell.showIcon()
    }
}

func collectionView(_ collectionView: UICollectionView,didDeselectItemAt indexPath: IndexPath) {
    if let cell = collectionView.cellForItem(at: indexPath) as? CustomCollectionViewCell {
        cell.hideIcon()
    }
}

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