用Swift写信给Plist

Question

我正在尝试用Xcode写一个plist。除了plist文件没有改变外，我写的东西都起作用了。我尝试了几个不同的实现，得到了相同的结果。

代码如下：

func saveGameData() {

    let BedroomFloorKey = "BedroomFloor"
    let BedroomWallKey = "BedroomWall"
        var bedroomFloorID: AnyObject = 101 as AnyObject
        var bedroomWallID: AnyObject = 101 as AnyObject
    
      let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) as NSArray
      let documentsDirectory = paths.object(at: 0) as! NSString
      let path = documentsDirectory.appendingPathComponent("room.plist")
        
        print("PATH", path)

      let dict: NSMutableDictionary = ["XInitializerItem": "DoNotEverChangeMe"]
      //saving values
      dict.setObject(bedroomFloorID, forKey: BedroomFloorKey as NSCopying)
      dict.setObject(bedroomWallID, forKey: BedroomWallKey as NSCopying)
      //...

      //writing to GameData.plist
      dict.write(toFile: path, atomically: false)

      let resultDictionary = NSMutableDictionary(contentsOfFile: path)
      print("Saved GameData.plist file is --> \(resultDictionary?.description ?? "")")
    }

我的plist位于xcode项目的主目录中，与ViewController所在的文件夹相同。

谢谢

Answer 1

在文档中创建plist文件

let path = documentsDirectory.appendingPathComponent("room.plist")

与位于主包中的文件不同（与viewcontroller.swift级别相同），该文件将不接受任何写入，因为包与应用程序签名，并且不能接受任何更改

Answer 2

由于明显的原因，您无法写入应用程序包，该包是只读的。

您的代码将plist写入应用程序容器中的documents目录。如果应用程序包中有一个默认属性列表文件，那么在应用程序首次启动时将其复制到Documents目录中。

然而，这段代码看起来像Objective-C代码的一个丑陋的直译。这是本地Swift版本

func saveGameData() throws {
    
    let bedroomFloorKey = "BedroomFloor"
    let bedroomWallKey = "BedroomWall"
    let bedroomFloorID = 101
    let bedroomWallID = 101
    
    let documentsDirectory = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
    let url = documentsDirectory.appendingPathComponent("room.plist")
    
    print("PATH", url)
    
    var dict : [String:Any] = ["XInitializerItem": "DoNotEverChangeMe"]
    //saving values
    dict[bedroomFloorKey] = bedroomFloorID
    dict[bedroomWallKey] = bedroomWallID
    //...
    
    //writing to GameData.plist
    let data = try PropertyListSerialization.data(fromPropertyList: dict, format: .xml, options: 0)
    try data.write(to: url)
    
    print("Saved GameData.plist file is --> \(dict)")
}

不需要重读数据。如果没有抛出错误，则plist已成功写入。