Question

当我尝试使用以下两种方法重新排序UICollectionView中单元格的位置时：

var teams: [Team]?

override func collectionView(_ collectionView: UICollectionView, canMoveItemAt indexPath: IndexPath) -> Bool {
    return true
}

override func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {

    if let temp = teams?[sourceIndexPath.item] {
        teams?[sourceIndexPath.item] = (teams?[destinationIndexPath.item])!
        teams?[destinationIndexPath.item] = temp
    }

    print("Starting Index: \(sourceIndexPath.item)")
    print("Ending Index: \(destinationIndexPath.item)")
}

它工作正常，但重新启动我的应用程序后，我想保存重新排序的单元格的位置。

你能推荐我哪种方法？

其他信息：

“团队”数组存储了Team类的对象：

class Team: NSObject {

    var id: String?
    var name: String?
    var logo: String?
    var players: [Player]?
}

class Player: NSObject {

    var alias: String?
    var name: String?
    var age: String?
    var country: String?
    var imageName: String?
    var info: Info?
}

class Info: NSObject {

    var screenshots: [String]?
    var bio: String?
    var gear: Gear?
    var povs: [String]?
    var cfg: Config?
}

class Gear: NSObject {

    var monitor: String?
    var mouse: String?
    var mousepad: String?
    var keyboard: String?
    var headset: String?
}

class Config: NSObject {

    var mouseSettings: [String]?
    var monitorSettings: [String]?
    var crosshaircfg: [String]?
}

提前感谢您的帮助！

Answer 1

我会使用UserDefaults。

我将位置存储为userDefaults中的整数，并使用项目名称作为键。

如何存储职位

func saveReorderedArray() {
    for (index, item) in yourArray.enumerated() {
        let position = index + 1
        UserDefaults.standard.set(position, forKey: item.name)
    }
}

在应用程序启动时，我调用reorderArray函数来获取位置，并使用项目名称作为键将其存储在字典数组中。

如何撤回职位

func reorderArray() {
    var items: [[String: Int]] = []

    // Get the positions
    for item in yourArray {
        var position = UserDefaults.standard.integer(forKey: item.name)

        // If a new item is added, set position to 999
        if position == 0 {
            position = 999
        }

        items.append([itemName : position])
    }

    for item in items {
        // Get position from dictionary
        let position = Array(item.values)[0]
        let itemName = Array(item.keys)[0]

        // Get index from yourArray
        let index = yourArray.index { (item) -> Bool in
            item.name == itemName
        }

        // Arrange the correct positions for the cells
        if let i = index {
            let m = yourArray.remove(at: i)

            // Append to last position of the array
            if position == 999 {
                yourArray.append(m)
            } 
            else {
                yourArray.insert(m, at: position - 1)  // Insert at the specific position
            }
        }
    }
}

我希望它有所帮助！

重新启动应用程序后，如何在Collection View中保存重新排序单元格的位置？迅速

1 个答案: