个人偏好设置，归档，解档

个人偏好设置

///  保存用户信息
- (void)saveUserInfo {

 //    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    // iOS 8.0 会直接写入沙盒，无需再使用 `[defaults synchronize];`
//保存在偏好设置里面
//    [userDefaults setObject:userName forKey:@"username"];
//    [userDefaults setObject:password forKey:@"password"];

}

    //1.从偏好设置中获取
//    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
//    
//    //获取原先保存用户名和密码
//    NSString *username = [userDefaults objectForKey:@"username"];
//    NSString *password = [userDefaults objectForKey:@"password"];

  归档反归档  
 //归档
         - (void)encodeWithCoder:(NSCoder *)aCoder
         {
         [aCoder encodeObject:self.name forKey:@"name"];
         [aCoder encodeObject:self.phone forKey:@"phone"];
         
         }
  //反归档

        - (id)initWithCoder:(NSCoder *)aDecoder
        {
            if (self = [super init])
            {
                self.name = [aDecoder decodeObjectForKey:@"name"];
                self.phone = [aDecoder decodeObjectForKey:@"phone"];
            }
            return self;
        }
 // 保存数据

             [NSKeyedArchiver   archiveRootObject:self.contacts   toFile:docPath];