在Swift中写入plist文件

我有一个示例plist文件favCities.plist。这是我的示例代码：

 override func viewDidLoad() {
    super.viewDidLoad()


    let path = NSBundle.mainBundle().pathForResource("favCities", ofType: "plist")
    var plistArray = NSArray(contentsOfFile: path) as [Dictionary<String, String>]

    var addDic: Dictionary = ["ZMV": "TEST", "Name": "TEST", "Country": "TEST"]
    plistArray += addDic
    (plistArray as NSArray).writeToFile(path, atomically: true)

    var plistArray2 = NSArray(contentsOfFile: path)

    for tempDict1 in plistArray2 {
        var tempDict2: NSDictionary = tempDict1 as NSDictionary
        var cityName: String = tempDict2.valueForKey("Name") as String
        var cityZMV: String = tempDict2.valueForKey("ZMV") as String
        var cityCountry: String = tempDict2.valueForKey("Country") as String
        println("City: \(cityName), ZMV: \(cityZMV), Country: \(cityCountry)")
    }

乍一看，一切正常。输出如下：

City: Moscow, ZMV: 00000.1.27612, Country: RU
City: New York, ZMV: 10001.5.99999, Country: US
City: TEST, ZMV: TEST, Country: TEST

但是，当我中断应用程序时，我发现我的文件favCities.plist没有更改。仍然有两个值。这些值--City: TEST, ZMV: TEST, Country: TEST未添加。如果我重新启动该应用程序，那么虽然应该有4行，但我仍然看到3行输出。

怎么了？

更新：

我将代码更改为此：

override func viewDidLoad() {
    super.viewDidLoad()

    let fileManager = (NSFileManager.defaultManager())
    let directorys : [String]? = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory,NSSearchPathDomainMask.AllDomainsMask, true) as? [String]

    if (directorys! != nil){
        let directories:[String] = directorys!;
        let dictionary = directories[0];

        let plistfile = "favCities.plist"
        let plistpath = dictionary.stringByAppendingPathComponent(plistfile);

        println("\(plistpath)")

        var plistArray = NSArray(contentsOfFile: plistpath) as [Dictionary<String, String>]

        var addDic: Dictionary = ["ZMV": "TEST", "Name": "TEST", "Country": "TEST"]
        plistArray += addDic

        (plistArray as NSArray).writeToFile(plistpath, atomically: false)

        var plistArray2 = NSArray(contentsOfFile: plistpath)

        for tempDict1 in plistArray2 {
            var tempDict2: NSDictionary = tempDict1 as NSDictionary
            var cityName: String = tempDict2.valueForKey("Name") as String
            var cityZMV: String = tempDict2.valueForKey("ZMV") as String
            var cityCountry: String = tempDict2.valueForKey("Country") as String
            println("City: \(cityName), ZMV: \(cityZMV), Country: \(cityCountry)")
        }
    }
    else {
        println("ERROR!")
    }

}

现在，当您运行应用程序时，输出中的行数增加了：

City: Moscow, ZMV: 00000.1.27612, Country: RU
City: New York, ZMV: 10001.5.99999, Country: US
City: TEST, ZMV: TEST, Country: TEST
City: TEST, ZMV: TEST, Country: TEST
........

但！如果查看位于项目文件夹（Xcode中的Project Navigator）中的favCities.plist文件，它仍然保持不变-有两行！

如果沿着路径行进，该路径存储在变量中plistpath-/Users/admin/Library/Developer/CoreSimulator/Devices/55FD9B7F-78F6-47E2-9874-AF30A21CD4A6/data/Containers/Data/Application/DEE6C3C8-6A44-4255-9A87-2CEF6082A63A/Documents/

然后还有一个文件favCities.plist。它包含对应用程序进行的所有更改。我究竟做错了什么？如何在项目文件夹（Project Navigator）中的文件中查看所有更改？