iOS swift-归档与解档

1.被归档的对象所在类必须遵守协议 NSCoding

2.被归档的对象所在类必须两个函数来规定如何归档和解档

// MARK:- 归档&解档 /// 解档的函数 init?(coder aDecoder: NSCoder) { } /// 归档的函数 func encodeWithCoder(aCoder: NSCoder) { }

举例:

被归档的对象所在类中(遵守协议 NSCoding)

UserAccount类

// MARK:- 属性 /// 授权AccessToken var access_token : String? /// 用户ID var uid : String? /// 过期日期 var expires_date : NSDate? /// 昵称 var screen_name : String? /// 用户的头像地址 var avatar_large : String?

// MARK:- 归档&解档 /// 解档的函数 required init?(coder aDecoder: NSCoder) { access_token = aDecoder.decodeObjectForKey("access_token") as? String uid = aDecoder.decodeObjectForKey("uid") as? String expires_date = aDecoder.decodeObjectForKey("expires_date") as? NSDate avatar_large = aDecoder.decodeObjectForKey("avatar_large") as? String screen_name = aDecoder.decodeObjectForKey("screen_name") as? String } /// 归档的函数 func encodeWithCoder(aCoder: NSCoder) { aCoder.encodeObject(access_token, forKey: "access_token") aCoder.encodeObject(uid, forKey: "uid") aCoder.encodeObject(expires_date, forKey: "expires_date") aCoder.encodeObject(avatar_large, forKey: "avatar_large") aCoder.encodeObject(screen_name, forKey: "screen_name") }

其它类中

归档

// 将account对象保存 // 1.获取沙盒路径 var accountPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first! accountPath = (accountPath as NSString).stringByAppendingPathComponent("account.plist") // 2.保存对象 NSKeyedArchiver.archiveRootObject(account, toFile: accountPath)

解档

// 从沙盒中读取归档的信息 // 1.获取沙盒路径 var accountPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first! accountPath = (accountPath as NSString).stringByAppendingPathComponent("account.plist") // 2.读取信息 let account = NSKeyedUnarchiver.unarchiveObjectWithFile(accountPath) as? UserAccount