CacheManager类作用：管理自定义信息的存储、获取、修改、清除
UserModel类作用：需要存储的model数据，遵循NSCoding协议
数据修改和存储示例：

UserModel *model = CacheManager.shareInstance.model;
model.nickname = @"test";
model.mobile = @"123";
[CacheManager.shareInstance saveCenterModel];

数据的获取示例：

NSLog(@"nickname-%@,mobil-%@",CacheManager.shareInstance.model.nickname,CacheManager.shareInstance.model.mobile);
 //nickname-test,mobil-123

CacheManager.h：

@class UserModel;
@interface CacheManager : NSObject

// 实例化
+(instancetype)shareInstance;
/** 用户信息 */
@property (nonatomic, strong)UserModel *model;
// 退出登录清除用户信息
- (void)clearUserInfo;
//储存用户数据
- (void)saveCenterModel;
//获取模型
- (UserModel *)getUserInfoModelData;

@end

CacheManager.m：

#import "CacheManager.h"
#import "UserModel.h"

static CacheManager *_singleInstance = nil;
@implementation CacheManager

+(instancetype)shareInstance
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        if (_singleInstance == nil) {
            _singleInstance = [[self alloc]init];
            [_singleInstance fetchCenterModel];
        }
    });
    return _singleInstance;
}
+(instancetype)allocWithZone:(struct _NSZone *)zone
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _singleInstance = [super allocWithZone:zone];
    });
    return _singleInstance;
}
-(id)copyWithZone:(NSZone *)zone
{
    return _singleInstance;
}
-(id)mutableCopyWithZone:(NSZone *)zone {
    return _singleInstance;
}
-(NSString *)GetDocumentPath
{
    NSArray *Paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [Paths objectAtIndex:0];
    return path;
}
#pragma mark - getter
/** 存储用户信息至本地 */
- (void)saveCenterModel{
    if (!self.model) return;
    NSString *targetPath = [[self  GetDocumentPath] stringByAppendingPathComponent:@"yuserinfo.data"];
    [NSKeyedArchiver archiveRootObject:self.model toFile:targetPath];
}
/** 获取本地用户信息 */
- (void)fetchCenterModel{
    NSString *targetPath = [[self  GetDocumentPath] stringByAppendingPathComponent:@"yuserinfo.data"];
    UserModel * userinfo = [NSKeyedUnarchiver unarchiveObjectWithFile:targetPath];
    if (!userinfo) userinfo = [UserModel new];
    self.model = userinfo;
}
//获取本地模型数据
- (UserModel *)getUserInfoModelData{
    NSString *targetPath = [[self  GetDocumentPath] stringByAppendingPathComponent:@"yuserinfo.data"];
    UserModel *userinfo = [NSKeyedUnarchiver unarchiveObjectWithFile:targetPath];
    if (!userinfo) userinfo = [UserModel new];
    return userinfo;
}
// 清空缓存用户model
- (void)clearUserInfo{
    self.model = [UserModel new];
    [self saveCenterModel];
}

@end

UserModel.h：

@interface UserModel : NSObject

@property (nonatomic, copy) NSString *nickname;
@property (nonatomic, copy) NSString *mobile;

@end

UserModel.m：

#import "UserModel.h"
#import <objc/runtime.h>
@implementation UserModel

//NSCoding协议方法：将需要归档的属性进行归档
- (void)encodeWithCoder:(NSCoder *)aCoder{
    unsigned int count = 0;
    Ivar *ivars = class_copyIvarList([UserModel class], &count);
    for(int i=0; i<count; i++){
        Ivar ivar = ivars[i];
        const char *name = ivar_getName(ivar);
        const char *type = ivar_getTypeEncoding(ivar);
        NSString *key =@(name);
        id value = [self valueForKey:key];
        if (strcmp(type, "q")==0 || strcmp(type, "d")==0) {
            NSNumber *num = (NSNumber *)value;
            [aCoder encodeInteger:num.integerValue forKey:key];
        } else {
            [aCoder encodeObject:value forKey:key];
        }
    }
    free(ivars);
}
//NSCoding协议方法：将需要解档的属性进行解档
- (id)initWithCoder:(NSCoder *)aDecoder{
    if (self = [super init]) {
        unsigned int count = 0;
        Ivar *ivars = class_copyIvarList([UserModel class], &count);
        for(int i=0; i<count; i++){
            Ivar ivar = ivars[i];
            const char *name = ivar_getName(ivar);
            const char *type = ivar_getTypeEncoding(ivar);
            NSString *key =@(name);
            if (strcmp(type, "q")==0 || strcmp(type, "d")==0) {
                NSInteger value = [aDecoder decodeIntegerForKey:key];
                if (value) {
                    [self setValue:@(value) forKey:key];
                }
            } else {
                NSString *value = [aDecoder decodeObjectForKey:key];
                if (value && ![value isEqual:[NSNull null]]) {
                    [self setValue:value forKey:key];
                }
            }
        }
        free(ivars);
    }
    return self;
}

@end