<code>fatal error: unexpectedly found nil while unwrapping an Optional value</code></p> <p>這裏是我的代碼：「致命錯誤：意外發現零而展開的可選值」使用的NSFileManager檢索多個值

Question

我收到以下錯誤，當我嘗試使用的NSFileManager檢索多個值時收到

class func loadGameData() -> (HighScore: Int, HasCompletedTutorial: Bool) { 
    // getting path to GameData.plist 
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray 
    let documentsDirectory = paths[0] as! String 
    let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist") 
    let fileManager = NSFileManager.defaultManager() 

    //check if file exists 
    if(!fileManager.fileExistsAtPath(path)) { 
     // If it doesn't, copy it from the default file in the Bundle 
     if let bundlePath = NSBundle.mainBundle().pathForResource("GameData", ofType: "plist") { 
      let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath) 
      fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil) 
     } 
    } 

    let resultDictionary = NSMutableDictionary(contentsOfFile: path) 
    var myDict = NSDictionary(contentsOfFile: path) 

    if let dict = myDict { 
     //loading values - THIS IS WHERE THE ERROR OCCURS 
     let HighScore: AnyObject = dict.objectForKey("HighScore")! 
     let CompletedTutorial: AnyObject = dict.objectForKey("HasCompletedTutorial")! 

     return (Int(HighScore as! NSNumber), Bool(CompletedTutorial as! NSNumber)) 
    } 

    return (0, false) 
} 

我已經測試了他們自己的兩條線，他們完美地工作。但他們似乎沒有一起工作

這裏是用來調用函數

let val = GameData.loadGameData() 
println(val.HighScore) 
println(val.HasCompletedTutorial) 

我已經測試此函數調用的多個變體的代碼，並沒有作出區別

謝謝你

Answer 1

你爲什麼不打開它們？嘗試類似這樣的

if let dict = myDict { 
    if let 
     highScore = dict.objectForKey("HighScore"), 
     completedTutorial = dict.objectForKey("HasCompletedTutorial") 
    { 
     return (Int(highScore as! NSNumber), Bool(completedTutorial as! NSNumber)) 
    } 
}