ios - swift 。 SIGABRT : cast value of type '__NSCFDictionary' to 'NSMutableArray'

Question

我正在制作转换器应用程序。我想保存转换历史记录。我看到了this教程，它工作正常，但当我尝试在我的应用程序上使用它时，我收到了 SIGABRT。

Could not cast value of type '__NSCFDictionary' (0x57945c) to 'NSMutableArray' (0x5791c8)

我在

notesArray = try NSPropertyListSerialization.propertyListWithData(data, options: NSPropertyListMutabilityOptions.MutableContainersAndLeaves, format: nil) 作为! NSMutableArray

编辑:

应用委托(delegate):

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    var plistPathInDocument:String = String()

    func preparePlistForUse(){

        let rootPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, .UserDomainMask, true)[0]

        plistPathInDocument = rootPath.stringByAppendingString("/historic.plist")
        if !NSFileManager.defaultManager().fileExistsAtPath(plistPathInDocument){
            let plistPathInBundle = NSBundle.mainBundle().pathForResource("historic", ofType: "plist") as String!

            do {
                try NSFileManager.defaultManager().copyItemAtPath(plistPathInBundle, toPath: plistPathInDocument)
            }catch{
                print("Error occurred while copying file to document \(error)")
            }
        }
    }

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        self.preparePlistForUse()
        return true
    }

    func applicationDidBecomeActive(application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
        self.preparePlistForUse()
    }
}

View Controller :

import UIKit

class ViewControllerHistorico: UITableViewController {

    var notesArray:NSMutableArray!
    var plistPath:String!

    override func viewWillAppear(animated: Bool) {
        let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
        plistPath = appDelegate.plistPathInDocument
        // Extract the content of the file as NSData
        let data:NSData =  NSFileManager.defaultManager().contentsAtPath(plistPath)!
        do{
            notesArray = try NSPropertyListSerialization.propertyListWithData(data, options: NSPropertyListMutabilityOptions.MutableContainersAndLeaves, format: nil) as! NSMutableArray
        }catch{
            print("Error occured while reading from the plist file")
        }
        self.tableView.reloadData()
    }

    override func tableView(tableView: UITableView,
        cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{

            let cell:UITableViewCell! = tableView.dequeueReusableCellWithIdentifier("cellIdentifier")
            cell.textLabel!.text = notesArray.objectAtIndex(indexPath.row) as? String
            return cell
    }
    override func tableView(tableView: UITableView,
        numberOfRowsInSection section: Int) -> Int{
            return notesArray.count
    }

    override func tableView(tableView: UITableView,
        commitEditingStyle editingStyle: UITableViewCellEditingStyle,
        forRowAtIndexPath indexPath: NSIndexPath){
            // remove the row from the array
            notesArray.removeObjectAtIndex(indexPath.row)
            self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Fade)
            notesArray.writeToFile(plistPath, atomically: true)
    }
}

historic.plist

Answer 1

您正在尝试将 Dictionary 转换为 NSMutableArray。

您可以通过将代码更改为将其保存为字典:

var notesDict: NSMutableDictionary = try NSPropertyListSerialization.propertyListWithData(data, options: NSPropertyListMutabilityOptions.MutableContainersAndLeaves, format: nil) as! NSMutableDictionary