OC：DAO

#import 

#define MZUserManager [MZAccountManager shareManager]

static NSString *const kUserManagerKey = @"kUserManagerKey";

@interface MZAccountManager : NSObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *mobileNo;

+ (instancetype)shareManager;

- (void)updateUserData;

- (void)resetUserData;

@end

#import "MZAccountManager.h"

//Libs
#import 

static MZAccountManager *instance = nil;
static dispatch_once_t onceToken;

@implementation MZAccountManager

+ (instancetype)shareManager {
    
    dispatch_once(&onceToken, ^{
        if (!instance) {
            instance = [[MZAccountManager alloc] init];
            [instance getUserData];
        }
    });
    return instance;
}

- (void)getUserData {
    
    NSDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:kUserManagerKey];
    [self mj_setKeyValues:dict];
}

- (void)updateUserData {
    
    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    [userDefault setObject:[self mj_JSONObject] forKey:kUserManagerKey];
    [userDefault synchronize];
}

- (void)resetUserData {
    
    instance = nil;
    onceToken = 0l;
    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    [userDefault removeObjectForKey:kUserManagerKey];
    [userDefault synchronize];
}

@end