Ios 如何在满足某些条件后立即重新加载UICollectionView单元格

我试图构建一个简单的级别设计，但在满足条件后立即重新加载单元格中的数据时遇到了一些问题。用户可以选择使用辅助游戏货币（stars）解锁他们还没有足够点数的关卡。当他们点击一个锁定的关卡时，如果他们有足够的星星，他们可以选择解锁它

我遇到的问题是，一旦模式被取消，级别不会立即解锁。我必须更改视图，然后返回到级别集合视图，以便单元格重新加载数据

我的故事板：

我的代码如下： 视图控制器

import UIKit

var stars = 10
var points = 11
var completeLevels:[String] = []

let levels = ["1","2","3","4","5","6","7","8","9"]

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate
{


@IBOutlet weak var collectionView: UICollectionView!

override func viewDidLoad()
{
    super.viewDidLoad()

}

override func viewDidAppear(_ animated: Bool)
{
    if points >= 10
    {
        completeLevels.append(levels[0])
    }
    if points >= 20
    {
        completeLevels.append(levels[1])
    }
    if points >= 30
    {
        completeLevels.append(levels[2])
    }
    if points >= 40
    {
        completeLevels.append(levels[3])
    }
    if points >= 50
    {
        completeLevels.append(levels[4])
    }
    if points >= 60
    {
        completeLevels.append(levels[5])
    }
    if points >= 70
    {
        completeLevels.append(levels[6])
    }
    if points >= 80
    {
        completeLevels.append(levels[7])
    }
    if points >= 90
    {
        completeLevels.append(levels[8])
    }
    completeLevels = Array(Set(completeLevels)).sorted()

    collectionView.reloadData()

}

override var prefersStatusBarHidden: Bool
{
    return true
}

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

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! LevelCollectionViewCell
    cell.levelName.text = levels[indexPath.row]

    cell.lockedLevel.alpha = 1
    for objects in completeLevels
    {
        if levels.contains(objects)
        {
            if levels.index(of: objects) == indexPath.row
            {
                cell.lockedLevel.alpha = 0

            }


        }
    }


    return cell
}

 }

 import UIKit

 class modalViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func dismissModal(_ sender: Any)
{
    dismiss(animated: true, completion: nil)
}

@IBOutlet weak var noStarsLabel: UILabel!
@IBAction func back(_ sender: Any)
{
    dismiss(animated: true, completion: nil)
}

@IBAction func unlockLevel(_ sender: UIButton)
{
    if stars >= 10
    {

        points += 10
        stars -= 10

        dismiss(animated: true, completion: nil)

    }else{
        noStarsLabel.text = "NOT ENOUGH STARS !"
    }
}


override var prefersStatusBarHidden: Bool
{
    return true
}

}

levelCollectionViewCell

 import UIKit

 class LevelCollectionViewCell: UICollectionViewCell
 {
     @IBOutlet weak var lockedLevel: UIButton!
     @IBOutlet weak var levelName: UILabel!


 }

modalViewController

import UIKit

var stars = 10
var points = 11
var completeLevels:[String] = []

let levels = ["1","2","3","4","5","6","7","8","9"]

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate
{


@IBOutlet weak var collectionView: UICollectionView!

override func viewDidLoad()
{
    super.viewDidLoad()

}

override func viewDidAppear(_ animated: Bool)
{
    if points >= 10
    {
        completeLevels.append(levels[0])
    }
    if points >= 20
    {
        completeLevels.append(levels[1])
    }
    if points >= 30
    {
        completeLevels.append(levels[2])
    }
    if points >= 40
    {
        completeLevels.append(levels[3])
    }
    if points >= 50
    {
        completeLevels.append(levels[4])
    }
    if points >= 60
    {
        completeLevels.append(levels[5])
    }
    if points >= 70
    {
        completeLevels.append(levels[6])
    }
    if points >= 80
    {
        completeLevels.append(levels[7])
    }
    if points >= 90
    {
        completeLevels.append(levels[8])
    }
    completeLevels = Array(Set(completeLevels)).sorted()

    collectionView.reloadData()

}

override var prefersStatusBarHidden: Bool
{
    return true
}

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

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! LevelCollectionViewCell
    cell.levelName.text = levels[indexPath.row]

    cell.lockedLevel.alpha = 1
    for objects in completeLevels
    {
        if levels.contains(objects)
        {
            if levels.index(of: objects) == indexPath.row
            {
                cell.lockedLevel.alpha = 0

            }


        }
    }


    return cell
}

 }

 import UIKit

 class modalViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func dismissModal(_ sender: Any)
{
    dismiss(animated: true, completion: nil)
}

@IBOutlet weak var noStarsLabel: UILabel!
@IBAction func back(_ sender: Any)
{
    dismiss(animated: true, completion: nil)
}

@IBAction func unlockLevel(_ sender: UIButton)
{
    if stars >= 10
    {

        points += 10
        stars -= 10

        dismiss(animated: true, completion: nil)

    }else{
        noStarsLabel.text = "NOT ENOUGH STARS !"
    }
}


override var prefersStatusBarHidden: Bool
{
    return true
}

}

gameViewController（模拟在整个游戏中获得点数和星星）

---

在您共享的代码中，我没有看到对modalViewController的存储引用。但是，处理此问题的最佳方法是将您的

@IBAction func dismissModal（u-sender:Any）

更改为：

@IBAction func back(_ sender: Any)
{
    collectionView.reloadData()
    dismiss(animated: true, completion: nil)
}

现在，根据VC呈现给您的modalViewController的是哪个/什么，您可能需要创建一个协议来处理重新加载，或者在创建时在您的modal中存储一个引用，这取决于您，但听起来您希望collectionView在用户做出选择后更新其数据/视图，这就是我将如何处理的

您还可以覆盖UIViewController的

视图将消失

，以触发重新加载collectionView：

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    collectionView.reloadData()
}

---

在您共享的代码中，我没有看到对modalViewController的存储引用。但是，处理此问题的最佳方法是将您的

@IBAction func dismissModal（u-sender:Any）

更改为：

@IBAction func back(_ sender: Any)
{
    collectionView.reloadData()
    dismiss(animated: true, completion: nil)
}

现在，根据VC呈现给您的modalViewController的是哪个/什么，您可能需要创建一个协议来处理重新加载，或者在创建时在您的modal中存储一个引用，这取决于您，但听起来您希望collectionView在用户做出选择后更新其数据/视图，这就是我将如何处理的

您还可以覆盖UIViewController的

视图将消失

，以触发重新加载collectionView：

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    collectionView.reloadData()
}

---

你的意思是

collectionView.reloadData（）

？你的意思是

collectionView.reloadData（）

？