Swift - 本地数据的保存与加载（使用NSCoder将对象保存到.plist文件）

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//从nsobject解析回来

init(coder aDecoder:NSCoder!){

    self.name=aDecoder.decodeObjectForKey("Name") as String

    self.phone=aDecoder.decodeObjectForKey("Phone") as String

}

//编码成object

func encodeWithCoder(aCoder:NSCoder!){

    aCoder.encodeObject(name,forKey:"Name")

    aCoder.encodeObject(phone,forKey:"Phone")

}

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import UIKit

class ViewController: UIViewController {

    var dataModel = DataModel()

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        //初始化模拟数据

        onCreateData()

    }

    //创建模拟数据

    func onCreateData(){

        dataModel.userList.append(UserInfo(name: "张三", phone: "1234"))

        dataModel.userList.append(UserInfo(name: "李四", phone: "1212"))

        dataModel.userList.append(UserInfo(name: "航歌", phone: "3525"))

    }

    //保存数据

    @IBAction func saveData(sender:AnyObject) {

        dataModel.saveData()

    }

    //读取数据

    @IBAction func loadData(sender:AnyObject) {

        dataModel.loadData()

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}

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import UIKit

class DataModel: NSObject {

    var userList = [UserInfo]()

    override init(){

        super.init()

        println("沙盒文件夹路径：\(documentsDirectory())")

        println("数据文件路径：\(dataFilePath())")

    }

    //保存数据

    func saveData() {

        var data = NSMutableData()

        //申明一个归档处理对象

        var archiver = NSKeyedArchiver(forWritingWithMutableData: data)

        //将lists以对应Checklist关键字进行编码

        archiver.encodeObject(userList, forKey: "userList")

        //编码结束

        archiver.finishEncoding()

        //数据写入

        data.writeToFile(dataFilePath(), atomically: true)

    }

    //读取数据

    func loadData() {

        //获取本地数据文件地址

        let path = self.dataFilePath()

        //声明文件管理器

        let defaultManager = NSFileManager()

        //通过文件地址判断数据文件是否存在

        if defaultManager.fileExistsAtPath(path) {

            //读取文件数据

            let data = NSData(contentsOfFile: path)

            //解码器

            let unarchiver = NSKeyedUnarchiver(forReadingWithData: data!)

            //通过归档时设置的关键字Checklist还原lists

            userList = unarchiver.decodeObjectForKey("userList") as Array

            //结束解码

            unarchiver.finishDecoding()

        }

    }

    //获取沙盒文件夹路径

    func documentsDirectory()->String {

        var paths = NSSearchPathForDirectoriesInDomains(

            NSSearchPathDirectory.DocumentationDirectory,NSSearchPathDomainMask.UserDomainMask,true)

        var documentsDirectory:String = paths.first as String

        return documentsDirectory

    }

    //获取数据文件地址

    func dataFilePath ()->String{

        return self.documentsDirectory().stringByAppendingString("userList.plist")

    }

}

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import UIKit

class UserInfo: NSObject {

    var name:String

    var phone:String

    //构造方法

    init(name:String="",phone:String=""){

        self.name = name

        self.phone = phone

        super.init()

    }

    //从nsobject解析回来

    init(coder aDecoder:NSCoder!){

        self.name=aDecoder.decodeObjectForKey("Name") as! String

        self.phone=aDecoder.decodeObjectForKey("Phone") as! String

    }

    //编码成object

    func encodeWithCoder(aCoder:NSCoder!){

        aCoder.encodeObject(name,forKey:"Name")

        aCoder.encodeObject(phone,forKey:"Phone")

    }

}