1）.h文件中

#define USER_ID         @"userid"
#define USER_NAME       @"username"
#define USER_BIRTHDAY   @"userbirthday"
#define USER_SEX        @"usersex"
#define USER_AVATAR     @"useravatar"
---------------------
@property (copy, nonatomic) NSString *userID;
@property (copy, nonatomic) NSString *userName;
@property (copy, nonatomic) NSString *userSex;
@property (copy, nonatomic) NSString *userBirthday;
@property (copy, nonatomic) NSString *userAvatar;
---------------------

/**
 *  归档单例
 *
 *  @return loginManager
 */
+ (instancetype)shareManager;

/**
 *  保存数据
 */
- (void)saveManager;

2）.m文件中

static YFLoginManager *manager = nil;
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    
    if (self = [super init]) {
        self.userID         = [aDecoder decodeObjectForKey:USER_ID];
        self.userName       = [aDecoder decodeObjectForKey:USER_NAME];
        self.userSex        = [aDecoder decodeObjectForKey:USER_SEX];
        self.userBirthday   = [aDecoder decodeObjectForKey:USER_BIRTHDAY];
        self.userAvatar     = [aDecoder decodeObjectForKey:USER_AVATAR];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    
    [aCoder encodeObject:self.userID forKey:USER_ID];
    [aCoder encodeObject:self.userName forKey:USER_NAME];
    [aCoder encodeObject:self.userSex forKey:USER_SEX];
    [aCoder encodeObject:self.userAvatar forKey:USER_AVATAR];
    [aCoder encodeObject:self.userBirthday forKey:USER_BIRTHDAY];
    
}

+ (instancetype)shareManager {
    if (!manager) {
        [self read];
        if (!manager) {
            manager = [[self alloc]init];
        }
    }
    return manager;
}

+ (YFLoginManager *)read {
    NSString *filename = [NSHomeDirectory() stringByAppendingString:@"/Library/Caches/loginManager.dat"];
    YFLoginManager *loginManager = [NSKeyedUnarchiver unarchiveObjectWithFile:filename];
    return loginManager;
}
- (void)saveManager {
    NSString *filename = [NSHomeDirectory() stringByAppendingString:@"/Library/Caches/loginManager.dat"];
    [NSKeyedArchiver archiveRootObject:self toFile:filename];
}