Question

我有一个级别设置的plist

defaultPrefs.plist

Root     Dictionary
Level1   Dictionary
 time     Number     0
 pushes   Number     0
 moves    Number     0
 unlocked Boolean    YES
Level2   Dictionary
 time     Number     0
 pushes   Number     0
 moves    Number     0
 unlocked Boolean    NO

等

我正在AppDelegate中注册它们

let plist: String? = "defaultPrefs"

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    let path = NSBundle.mainBundle().pathForResource(plist, ofType: "plist")!
    let dict = NSDictionary(contentsOfFile: path) as! [String: AnyObject]
    NSUserDefaults.standardUserDefaults().registerDefaults(dict)
}

我想更新这些

 func writeToPlist() {
      let defaults = NSUserDefaults.standardUserDefaults()
      let level1Dict:AnyObject = defaults.objectForKey("Level1")!
      //let level1Dict:AnyObject = defaults.dictionaryForKey("Level1")!
      level1Dict.setValue(1, forKey: "moves")          
      //level1Dict.setInteger(1, forKey: "moves")
 }

错误：

发送到不可变对象的变异方法

我会传入变量来选择Dict Level和Key等一旦它正常工作

更新

let level1Dict:AnyObject = defaults.objectForKey("Level1")!.mutableCopy()

level1Dict.setValue(1, forKey: "moves")
defaults.setObject(level1Dict, forKey: "Level1")

Answer 1

从用户默认值返回的字典是不可变的，因此您需要制作一个可变副本才能编辑它：

let level1Dict:AnyObject = defaults.objectForKey("Level1")!.mutableCopy()

另请注意，编辑字典不会自动更新用户默认值，您需要为键设置新字典（以替换旧设置的完整字典）。

更新NSUserDefaults嵌套字典

1 个答案: