使用简单数据快速写入和读取 plist

Question

我试图了解如何在 plist 中保存一个简单的值，一个整数。 但我在网上找到了保存字典和数组的唯一解决方案，我不明白我可以改变什么来只为整数工作。 这是目前的代码...

var musicalChoice = 1
var musicString : String = "5"

override func viewDidLoad() {
    super.viewDidLoad()
    musicString = String(musicalChoice)}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func writePlist() {
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
    let documentsDirectory = paths.objectAtIndex(0) as NSString
    let path = documentsDirectory.stringByAppendingPathComponent("Preferences.plist")
    musicString.writeToFile(path, atomically: true, encoding: NSUTF8StringEncoding, error:nil )
}

func readPlist() {

}

Answer 1

您不能将数组或字典以外的任何内容作为 plist 中的根对象。这是因为 plist 文件本质上是特殊的 xml 文件，因此当您尝试读取文件时，您会在 key 处请求对象或在索引处请求对象，否则您将无法获取数据。此外，在将数字插入 plist 时，您必须将它们包装在 NSNumber 类中。要保存您的对象，请查看此answer。

Answer 2

Swift 4 更新

我已经创建了 SwiftyPlistManager。在 GiHub 上查看并按照以下视频说明进行操作：

https://www.youtube.com/playlist?list=PL_csAAO9PQ8bKg79CX5PEfn886SMMDj3j

Swift 3.1 更新

let BedroomFloorKey = "BedroomFloor"
let BedroomWallKey = "BedroomWall"
var bedroomFloorID: Any = 101
var bedroomWallID: Any = 101

func loadGameData() {

  // getting path to GameData.plist
  let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) as NSArray
  let documentsDirectory = paths.object(at: 0) as! NSString
  let path = documentsDirectory.appendingPathComponent("GameData.plist")

  let fileManager = FileManager.default

  //check if file exists
  if !fileManager.fileExists(atPath: path) {

    guard let bundlePath = Bundle.main.path(forResource: "GameData", ofType: "plist") else { return }

    do {
      try fileManager.copyItem(atPath: bundlePath, toPath: path)
    } catch let error as NSError {
      print("Unable to copy file. ERROR: \(error.localizedDescription)")
    }
  }

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

  let myDict = NSDictionary(contentsOfFile: path)

  if let dict = myDict {
    //loading values
    bedroomFloorID = dict.object(forKey: BedroomFloorKey)!
    bedroomWallID = dict.object(forKey: BedroomWallKey)!
    //...
  } else {
    print("WARNING: Couldn't create dictionary from GameData.plist! Default values will be used!")
  }
}

func saveGameData() {

  let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) as NSArray
  let documentsDirectory = paths.object(at: 0) as! NSString
  let path = documentsDirectory.appendingPathComponent("GameData.plist")

  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 ?? "")")
}

这是我用来快速读取/写入 plist 文件的方法：

let BedroomFloorKey = "BedroomFloor"
let BedroomWallKey = "BedroomWall"
var bedroomFloorID: AnyObject = 101
var bedroomWallID: AnyObject = 101

func loadGameData() {

// 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)
    println("Bundle GameData.plist file is --> \(resultDictionary?.description)")

    fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil)
    println("copy")
  } else {
    println("GameData.plist not found. Please, make sure it is part of the bundle.")
  }
} else {
  println("GameData.plist already exits at path.")
  // use this to delete file from documents directory
  //fileManager.removeItemAtPath(path, error: nil)
}

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

var myDict = NSDictionary(contentsOfFile: path)

if let dict = myDict {
  //loading values
  bedroomFloorID = dict.objectForKey(BedroomFloorKey)!
  bedroomWallID = dict.objectForKey(BedroomWallKey)!
  //...
} else {
  println("WARNING: Couldn't create dictionary from GameData.plist! Default values will be used!")
}
}

func saveGameData() {

let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
let documentsDirectory = paths.objectAtIndex(0) as NSString
let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist")

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

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

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

plist 文件是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>BedroomFloor</key>
    <integer>101</integer>
    <key>BedroomWall</key>
    <integer>101</integer>
    <key>XInitializerItem</key>
    <string>DoNotEverChangeMe</string>
</dict>
</plist>

Answer 3

我在 swift 上读取和写入 .plist 的变体函数，在设备上进行了测试。

示例：
var dataVersion = readPlist("Options", key: "dataVersion")
writePlist("Options", key: "dataVersion", data: 1.23)

功能：

func readPlist(namePlist: String, key: String) -> AnyObject{
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
    let documentsDirectory = paths.objectAtIndex(0) as! NSString
    let path = documentsDirectory.stringByAppendingPathComponent(namePlist+".plist")

    var output:AnyObject = false

    if let dict = NSMutableDictionary(contentsOfFile: path){
        output = dict.objectForKey(key)!
    }else{
        if let privPath = NSBundle.mainBundle().pathForResource(namePlist, ofType: "plist"){
            if let dict = NSMutableDictionary(contentsOfFile: privPath){
                output = dict.objectForKey(key)!
            }else{
                output = false
                println("error_read")
            }
        }else{
            output = false
            println("error_read")
        }
    }
    return output
}
func writePlist(namePlist: String, key: String, data: AnyObject){
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
    let documentsDirectory = paths.objectAtIndex(0) as! NSString
    let path = documentsDirectory.stringByAppendingPathComponent(namePlist+".plist")

    if let dict = NSMutableDictionary(contentsOfFile: path){
        dict.setObject(data, forKey: key)
        if dict.writeToFile(path, atomically: true){
            println("plist_write")
        }else{
            println("plist_write_error")
        }
    }else{
        if let privPath = NSBundle.mainBundle().pathForResource(namePlist, ofType: "plist"){
            if let dict = NSMutableDictionary(contentsOfFile: privPath){
                dict.setObject(data, forKey: key)
                if dict.writeToFile(path, atomically: true){
                    println("plist_write")
                }else{
                    println("plist_write_error")
                }
            }else{
                println("plist_write")
            }
        }else{
            println("error_find_plist")
        }
    }
}