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Bob
Asked: 2024-07-25 10:15:10 +0800 CST

根据对另一个字典的更改来更新字典中的值

  • 772

我想知道是否有一种方法可以根据对另一个词典中的值所做的更改自动更新词典中的值。我有 2 个词典，如下所示：

enum CharacterAttributes: String, Codable  {
    case strength
    case constitution
    case dexterity
    case intelligence
}

enum CharacterStats: String, Codable  {
    case maxHealthPoint
    case maxTacticPoint
    case maxActionPoint
    case movementSpeed
}

var attributes = [CharacterAttributes: Float]()
var stats = [CharacterStats: Float]()

其逻辑如下：

stats[.maxHealthPoint] = attributes[.constitution] *  100
stats[.maxTacticPoint] = (attributes[.dexterity] +  attributes[.intelligence]) * 1.5
stats[.maxActionPoint] = attributes[.constitution] * 10
stats[.movementSpeed] = attributes[.dexterity] + 70

我想要实现的是，每当属性字典中的值发生变化时，统计信息中的相应值就会自动更新。我知道对于普通变量我可以使用 didSet 关键字，但如何将这个概念应用于字典？

在此先感谢您的帮助。

swift

1 个回答

  1. Best Answer

    didSet将字典封装到类中后尝试使用观察者：

    import Foundation

enum CharacterAttributes: String, Codable {
    case strength
    case constitution
    case dexterity
    case intelligence
}

enum CharacterStats: String, Codable {
    case maxHealthPoint
    case maxTacticPoint
    case maxActionPoint
    case movementSpeed
}

class Character {
    private var _attributes = [CharacterAttributes: Float]() {
        didSet {
            updateStats()
        }
    }
    
    private var _stats = [CharacterStats: Float]()
    
    var attributes: [CharacterAttributes: Float] {
        get { _attributes }
        set {
            _attributes = newValue
            updateStats()
        }
    }
    
    var stats: [CharacterStats: Float] {
        get { _stats }
        set {
            _stats = newValue
        }
    }
    
    init(attributes: [CharacterAttributes: Float]) {
        self._attributes = attributes
        updateStats()
    }
    
    private func updateStats() {
        _stats[.maxHealthPoint] = (_attributes[.constitution] ?? 0) * 100
        _stats[.maxTacticPoint] = ((_attributes[.dexterity] ?? 0) + (_attributes[.intelligence] ?? 0)) * 1.5
        _stats[.maxActionPoint] = (_attributes[.constitution] ?? 0) * 10
        if _stats[.movementSpeed] == nil { // Allow manual setting
            _stats[.movementSpeed] = (_attributes[.dexterity] ?? 0) + 70
        }
    }
}

    用法示例：

    var character = Character(attributes: [.constitution: 5, .dexterity: 3, .intelligence: 2])
print(character.stats)
character.attributes[.constitution] = 7
character.stats[.movementSpeed] = 100
character.attributes[.dexterity] = 4
print(character.stats)

    输出：

    [SwiftPlayground.CharacterStats.maxHealthPoint: 500.0, SwiftPlayground.CharacterStats.maxTacticPoint: 7.5, SwiftPlayground.CharacterStats.maxActionPoint: 50.0, SwiftPlayground.CharacterStats.movementSpeed: 73.0]
[SwiftPlayground.CharacterStats.maxHealthPoint: 700.0, SwiftPlayground.CharacterStats.maxTacticPoint: 9.0, SwiftPlayground.CharacterStats.maxActionPoint: 70.0, SwiftPlayground.CharacterStats.movementSpeed: 100.0]
    • 3

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