Swift - Aktualisieren von Werten eines multidimensionalen NSMutableDictionary

Question

Im Beispiel unten versuche ich, eine multidimensional NSMutableDictionary zu ändern. Kann jemand bitte den korrekten Weg erklären, ein mehrdimensionales veränderbares Wörterbuch zu ändern?

import Cocoa 

let player = "Player 1" 
let characterName = "Magic Glop" 
let strength = 23 
let defense = 220 
let type = "fire" 

var example: NSMutableDictionary = ["id":1, 
       "player":player, 
       "characters": 
        ["character-name":characterName, 
        "stats": 
         ["strength":strength, 
         "defense":defense, 
         "type":type 
         ] 
        ] 
       ] 

// My first attempt to update character-name. 
example["characters"]!["character-name"] = "New Name" 
// Error: Cannot assign to immutable expression of type 'AnyObject?!' 

// Next I tried updating the value of "characters">"stats">"type" with .setObject 
example["characters"]!["stats"]!!.setObject("water", forKey: "type") 
// Documentation: .setObject adds a given key-value pair to the dictionary. If the key already exists in the dictionary, the object takes its place. 
// Error: Execution was interrupted, reason: EXC_BAD INSTRUCTION (code=EXC_i386_INVOP, suncode=0x0). 

Vielen Dank im Voraus!

Answer 1

Klasse Ansatz: Sie var-let für nicht editierbare Parameter aktualisieren können.

class Player { 
    let id: Int 
    var name: String 
    var characters = [Character]() 

    init(id: Int, name: String) { 
    self.id = id 
    self.name = name 
    } 

    /** 
    Add new char to Player 
    */ 
    func addNewCharacter(new: Character) { 
    self.characters.append(new) 
    } 
} 

class Character { 
    var name: String 
    var strength: Int 
    var defense: Int 
    var type: String 

    init(name: String, strength: Int, defense: Int, type: String) { 
    self.name = name 
    self.strength = strength 
    self.defense = defense 
    self.type = type 
    } 
} 

func createPlayer() { 
    let player1 = Player(id: 1, name: "Bodrum") 

    // create new char and add to the player1 named Bodrum 
    let char1 = Character(name: "Magic Glop", strength: 23, defense: 220, type: "fire") 
    player1.addNewCharacter(char1) 

    print("old name:\(player1.characters[0].name), old type:\(player1.characters[0].type)") 

    // update char1's parameters 
    player1.characters[0].name = "Yalikavak" 
    player1.characters[0].type = "water" 

    print("new name:\(player1.characters[0].name), new type:\(player1.characters[0].type)") 
    } 

// old name:Magic Glop, old type:fire 
// new name:Yalikavak, new type:water 

Answer 2

Überprüfen Sie diese Antwort.

let player = "Player 1" 
     let characterName = "Magic Glop" 
     let strength = 23 
     let defense = 220 
     let type = "fire" 

     var example: [String: AnyObject] = ["id":1, 
      "player":player, 
      "characters": 
       ["character-name":characterName, 
        "stats": 
         ["strength":strength, 
          "defense":defense, 
          "type":type 
        ] 
      ] 
     ] 

     print(example) 

     var charDic = example["characters"] as! [String: AnyObject] 
     charDic["character-name"] = "New Name" // change value for key character-name 

     var statsDic = charDic["stats"] as! [String: AnyObject] 
     statsDic["type"] = "water" // change the value for type 


     charDic["stats"] = statsDic // assign updated dic for key stats 

     example["characters"] = charDic // assign updated dic for key chacracters 

     print(example)