iOS NSKeyedArchiver

来源：互联网发布：nosql数据库入门编辑：程序博客网时间：2024/05/19 07:07

iOS本地缓存数据方式有五种：

1.直接写文件方式：可以存储的对象有NSString、NSArray、NSDictionary、NSData、NSNumber，数据全部存放在一个属性列表文件（*.plist文件）中。

2.NSUserDefaults（偏好设置），用来存储应用设置信息，文件放在perference目录下。

3.归档操作（NSkeyedArchiver），不同于前面两种，它可以把自定义对象存放在文件中。

4.coreData:coreData是苹果官方iOS5之后推出的综合型数据库，其使用了ORM(Object Relational Mapping)对象关系映射技术，将对象转换成数据，存储在本地数据库中。coreData为了提高效率，甚至将数据存储在不同的数据库中，且在使用的时候将本地数据放到内存中使得访问速度更快。我们可以选择coreData的数据存储方式，包括sqlite、xml等格式。但也正是coreData 是完全面向对象的，其在执行效率上比不上原生的数据库。除此之外，coreData拥有数据验证、undo等其他功能，在功能上是几种持久化方案最多的。

5.FMDB：FMDB是iOS平台的SQLite数据库框架，FMDB以OC的方式封装了SQLite的C语言API，使用起来更加面向对象，省去了很多麻烦、冗余的C语言代码，对比苹果自带的Core Data框架，更加轻量级和灵活，提供了多线程安全的数据库操作方法，有效地防止数据混乱。

接下来我将介绍第三种缓存机制归档操作：

作为轻量级存储的持久化方案，数据归档是进行加密处理的，数据在经过归档处理会转换成二进制数据，所以安全性要远远高于属性列表。另外使用归档方式，我们可以将复杂的对象写入文件中，并且不管添加多少对象，将对象写入磁盘的方式都是一样的。

使用NSKeyedArchiver对自定义的数据进行序列化，并且保存在沙盒目录下。使用这种归档的前提是让存储的数据模型遵守NSCoding协议并且实现其两个协议方法。（当然，如果为了更加安全的存储，也可以遵守NSSecureCoding协议，这是iOS6之后新增的特性）

使用归档操作存储数据的主要好处是，不同于前面两种方法只能存储几个常用的数据类型的数据，NSKeyedArchiver可以存储自定义的对象。

/**代码示例**/

先创建一个继承NSObject的类，该类遵守NSCoding协议

#import <Foundation/Foundation.h>

@interface JXItem : NSObject<NSCoding>

@property (nonatomic, assign) NSInteger collect;

@property (nonatomic, assign) NSInteger collect_num;

@property (nonatomic, assign) NSInteger courseid;

@property (nonatomic, copy) NSString *coverpic;

@property (nonatomic, assign) long long date_end;

@property (nonatomic, assign) long long date_start;

@property (nonatomic, assign) NSInteger groupid;

@property (nonatomic, assign) NSInteger invitation_code;

@property (nonatomic, assign) NSInteger is_live;

@property (nonatomic, assign) NSInteger paid;

@property (nonatomic, assign) NSInteger play_num;

@property (nonatomic, copy) NSString *price;

@property (nonatomic, assign) NSInteger product_id;

@property (nonatomic, copy ) NSString *product_info;

@property (nonatomic, copy) NSString *productname;

@property (nonatomic, copy) NSString *realname;

@property (nonatomic,assign) NSInteger recomment;

@property (nonatomic ,copy) NSString *stream_url;

@property (nonatomic, copy) NSString *time_duan;

@property (nonatomic,assign) NSInteger user_id;

@property (nonatomic, assign) NSInteger viewtype;

@property (nonatomic, assign) NSInteger live_in;

+ (instancetype)randomDictionary:(NSDictionary *)dictionary;

@end

其次在模型的.m文件进行读取解析，归档和解归档

#import "JXItem.h"

@implementation JXItem

+ (instancetype)randomDictionary:(NSDictionary *)dictionary {

JXItem *item = [[JXItem alloc] init];

[item setValuesForKeysWithDictionary:dictionary];

return item;

}

- (void)encodeWithCoder:(NSCoder *)aCoder {

[aCoder encodeInteger:self.collect forKey:@"collect"];

[aCoder encodeInteger:self.collect_num forKey:@"collect_num"];

[aCoder encodeInteger:self.courseid forKey:@"courseid"];

[aCoder encodeObject:self.coverpic forKey:@"coverpic"];

[aCoder encodeInteger:self.date_end forKey:@"date_end"];

[aCoder encodeInteger:self.date_start forKey:@"date_start"];

[aCoder encodeInteger:self.groupid forKey:@"groupid"];

[aCoder encodeInteger:self.invitation_code forKey:@"invitation_code"];

[aCoder encodeInteger:self.paid forKey:@"paid"];

[aCoder encodeInteger:self.play_num forKey:@"play_num"];

[aCoder encodeObject:self.price forKey:@"price"];

[aCoder encodeInteger:self.product_id forKey:@"product_id"];

[aCoder encodeObject:self.product_info forKey:@"product_info"];

[aCoder encodeObject:self.productname forKey:@"productname"];

[aCoder encodeObject:self.realname forKey:@"realname"];

[aCoder encodeInteger:self.recomment forKey:@"recomment"];

[aCoder encodeObject:self.stream_url forKey:@"stream_url"];

[aCoder encodeObject:self.time_duan forKey:@"time_duan"];

[aCoder encodeInteger:self.user_id forKey:@"user_id"];

[aCoder encodeInteger:self.viewtype forKey:@"viewtype"];

[aCoder encodeInteger:self.live_in forKey:@"live_in"];

}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {

self = [super init];

if (self) {

_collect = [aDecoder decodeIntegerForKey:@"collect"];

_collect_num = [aDecoder decodeIntegerForKey:@"collect_num"];

_coverpic = [aDecoder decodeObjectForKey:@"coverpic"];

_date_end = [aDecoder decodeIntegerForKey:@"date_end"];

_date_start = [aDecoder decodeIntegerForKey:@"date_start"];

_groupid = [aDecoder decodeIntegerForKey:@"groupid"];

_invitation_code = [aDecoder decodeIntegerForKey:@"invitation_code"];

_paid = [aDecoder decodeIntegerForKey:@"paid"];

_price = [aDecoder decodeObjectForKey:@"price"];

_product_id = [aDecoder decodeIntegerForKey:@"product_id"];

_product_info = [aDecoder decodeObjectForKey:@"product_info"];

_productname = [aDecoder decodeObjectForKey:@"productname"];

_realname = [aDecoder decodeObjectForKey:@"realname"];

_recomment = [aDecoder decodeIntegerForKey:@"recomment"];

_stream_url = [aDecoder decodeObjectForKey:@"stream_url"];

_time_duan = [aDecoder decodeObjectForKey:@"time_duan"];

_viewtype = [aDecoder decodeIntegerForKey:@"viewtype"];

}

return self;

}

@end

另外建立一个数据的管理类JXItemStore

#import <Foundation/Foundation.h>

@class JXItem;

@interface JXItemStore : NSObject

@property (nonatomic, copy) NSString *archiveName;

@property (nonatomic, strong) NSArray *allItem;

+ (instancetype)sharedStore;

- (JXItem *)createItem:(JXItem *)item;

/**

* 删除对象

* @param item 需要删除的对象

- (void)removeItem:(JXItem *)item;

/**

* 移除对象

* @param fromIndex 移除对象的起始位置

* @param toIndex 移除后的位置

- (void)moveItemAtIndex:(NSInteger)fromIndex toIndex:(NSInteger)toIndex;

- (BOOL)saveChanages;

@end

#import "JXItemStore.h"

#import "JXItem.h"

@interface JXItemStore()

@property (nonatomic, strong) NSMutableArray *privateItems;

@end

@implementation JXItemStore

+ (instancetype)sharedStore {

static JXItemStore *sharedStore = nil;

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

sharedStore = [[self alloc] init];

});

return sharedStore;

}

- (BOOL)saveChanages {

return [NSKeyedArchiver archiveRootObject:self.privateItems

toFile:[self itemArchivePath]];

}

- (NSArray *)getAll {

[self.privateItems setArray:[NSKeyedUnarchiver unarchiveObjectWithFile: [self itemArchivePath]]];

return self.privateItems;

}

- (void)removeItem:(JXItem *)item {

[self.privateItems removeObjectIdenticalTo:item];

}

- (void)moveItemAtIndex:(NSInteger)fromIndex toIndex:(NSInteger)toIndex {

if (fromIndex == toIndex) {

return;

}

JXItem *item = self.privateItems[fromIndex];

[self.privateItems removeObjectAtIndex:fromIndex];

[self.privateItems insertObject:item atIndex:toIndex];

}

- (NSMutableArray *)privateItems {

if (!_privateItems) {

_privateItems = [[NSMutableArray alloc] init];

[self getAll];

}

return _privateItems;

}

- (NSArray *)allItem {

return [self.privateItems copy];

}

- (JXItem *)createItem:(JXItem *)item {

[self.privateItems addObject:item];

return item;

}

- (NSString *)itemArchivePath {

NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentDirectory = [documentDirectories firstObject];

if (!_archiveName) {

return [documentDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"putcharTems.archive"]];

}

return [documentDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@items.archive",_archiveName]];

}

这样子，我们就可以进行数据的请求了 ZXHttpRequestManager类只是一个对AFNetworking请求库封装的一个网络请求管理类

#define kDomain_name @"www.niulaile.tv"//test.91kanjian.com"

#import "ViewController.h"

#import "ZXHttpRequestManager.h"

#import "JXItemStore.h"

#import "JXItem.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

NSString *url = [NSString stringWithFormat:@"http://%@//kj.php?m=Course&a=dotv_newindex",kDomain_name];

JXItemStore *manager = [JXItemStore sharedStore];

manager.archiveName = @"JXModel";

__weak typeof(manager) weakManager = manager;

[[ZXHttpRequestManager manager] POST:url parameters:nil success:^(ZXHttpRequestCode code, id response) {

if(code == ZXHttpRequestSuccess) {

if([response[@"status"] integerValue] == 1) {

for (NSDictionary *dict in response[@"data"]) {

JXItem *item = [JXItem randomDictionary:dict];

[weakManager createItem:item];

}

NSArray *array = weakManager.allItem;

NSLog(@"%@",array);

}

} failure:^(NSInteger errorCode, NSError *error) {

NSArray *array = weakManager.allItem;

NSLog(@"%@",array);

}];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

0 0