Swift

下面通过一个例子将联系人数据保存到沙盒的“documents”目录中。（联系人是一个数组集合，内部为自定义对象）。

功能如下：

1，点击“保存”将联系人存入userList.plist文件中

2，点击“读取”从数据文件中加载解析出联系人

注意：

1，本例使用了NSCoder，这个封装了许多技术细节，使用它我们可以很轻易的将对象写到文件中，也可以用它将文件中的对象转换回来。

2，自定义对象必须添加如下两个方法，这个才能顺利的被序列化编码存储和读取。

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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") }

具体代码如下：

--- ViewController.swift ---

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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.     } }

--- DataModel.swift ---

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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")     } }

--- UserInfo.swift ---

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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")     } }