xcode - 在 NSUserDefaults 中存储字典导致 EXC_BAD_ACCESS

Question

//Declarations
var scoreIncrement:Int = 0
var team = ""
var userScore = Dictionary<String,Int>()

//Set Values
team = "USA"
userScore[team] = 0

//Store in NSUserDefaults
NSUserDefaults.standardUserDefaults().setObject(userScore, forKey: "userScore")
NSUserDefaults.standardUserDefaults().synchronize()

//Increment Score
scoreIncrement = 1
userScore[team]! += scoreIncrement

以上代码在代码的最后一行给出“EXC_BAD_ACCESS(code=EXC_I386_GPFLT)”错误。但是，如果我注释掉一行:

NSUserDefaults.standardUserDefaults().setObject(userScore, forKey: "userScore")

错误消失了。知道为什么会这样，我什至还没有从 NSUserDefaults 检索字典。

Answer 1

通过在保存字典后立即从 NSUserDefaults 中检索字典来解决问题:

var userScoreTemp : AnyObject? = NSUserDefaults.standardUserDefaults().objectForKey("userScore")
    if userScoreTemp != nil {
        userScore = userScoreTemp! as Dictionary
    }