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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