iOS 数据持久化二-对象归档
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iOS中有五种持久化数据的方式:属性列表、对象归档、NSUserDefaults、SQLite3和Core Data。
本文介绍对象归档来持久化数据。归档的作用就是将对象以文件的形式保存到磁盘中,以使得数据序列化和持久化。
使用归档的时候读取该文件保存路径来读取文件的内容,归档的文件是进行过保密处理的,在磁盘上是无法查看文件的内容的,这也是和属性列表的区别:属性列表是明文,可以直接从磁盘查看其内容。
使用归档需要使用NSCoding协议中的代理两个方法
- @protocol NSCoding
- - (void)encodeWithCoder:(NSCoder *)aCoder;
- - (id)initWithCoder:(NSCoder *)aDecoder;
- @end
- //
- // ScoreCard.h
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import <Foundation/Foundation.h>
- //遵循NSCoding协议
- @interface ScoreCard : NSObject<NSCoding>
- {
- NSString *_bestTime;
- NSMutableArray *_allTimes;
- }
- @property (copy, nonatomic) NSString *bestTime;
- @property (copy) NSMutableArray *allTimes;
- @end
- //
- // ScoreCard.m
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import "ScoreCard.h"
- @implementation ScoreCard
- @synthesize bestTime = _bestTime;
- @synthesize allTimes = _allTimes;
- - (void)dealloc
- {
- [_bestTime release];
- [_allTimes release];
- [super dealloc];
- }
- - (id)init
- {
- if (self = [super init]) {
- _bestTime = [[NSString alloc] init];
- _allTimes = [[NSMutableArray alloc] init];
- }
- return self;
- }
- //解码方法
- - (id)initWithCoder:(NSCoder *)aDecoder
- {
- if (self = [super init]) {
- _bestTime = [[aDecoder decodeObjectForKey:@"bestTime"] retain];
- _allTimes = [[aDecoder decodeObjectForKey:@"allTimes"] retain];
- }
- return self;
- }
- //编码方法
- - (void)encodeWithCoder:(NSCoder *)aCoder
- {
- [aCoder encodeObject:_bestTime forKey:@"bestTime"];
- [aCoder encodeObject:_allTimes forKey:@"allTimes"];
- }
- @end
- //
- // Athlete.h
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import <Foundation/Foundation.h>
- @class ScoreCard;
- //遵守NSCoding 协议
- @interface Athlete : NSObject<NSCoding>
- {
- NSString *_name;
- NSString *_bio;
- NSString *_phoneNumber;
- ScoreCard *_scoreCard;
- BOOL _eligible;
- }
- @property (copy) NSString *name, *bio, *phoneNumber;
- @property (retain) ScoreCard *scoreCard;
- @property (getter = isEligible) BOOL eligible;
- - (void)print;
- @end
- //
- // Athlete.m
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import "Athlete.h"
- #import "ScoreCard.h"
- @implementation Athlete
- @synthesize name = _name, bio = _bio, phoneNumber = _phoneNumber, scoreCard = _scoreCard, eligible = _eligible;
- - (void)dealloc
- {
- [_name release];
- [_bio release];
- [_scoreCard release];
- [super dealloc];
- }
- - (id)init
- {
- if (self = [super init]) {
- _name = [[NSString alloc] init];
- _bio = [[NSString alloc] init];
- _phoneNumber = [[NSString alloc] init];
- _scoreCard = [[ScoreCard alloc] init];
- _eligible = YES;
- }
- return self;
- }
- //解码方法
- - (id)initWithCoder:(NSCoder *)aDecoder
- {
- if (self = [super init]) {
- _name = [[aDecoder decodeObjectForKey:@"name"] retain];
- _bio = [[aDecoder decodeObjectForKey:@"bio"] retain];
- _scoreCard = [[aDecoder decodeObjectForKey:@"scoreCard"] retain];
- //BOOL类型变量解码
- _eligible = [aDecoder decodeBoolForKey:@"eligible"];
- }
- return self;
- }
- //编码方法
- - (void)encodeWithCoder:(NSCoder *)aCoder
- {
- [aCoder encodeObject:_name forKey:@"name"];
- [aCoder encodeObject:_bio forKey:@"bio"];
- [aCoder encodeObject:_scoreCard forKey:@"scoreCard"];
- //BOOL类型变量归档
- [aCoder encodeBool:_eligible forKey:@"eligible"];
- }
- - (void)print
- {
- NSLog(@"Name: %@\nBio: %@\nTel: %@\n\nBest Time: %@\n\nAll Times:", _name, _bio, _phoneNumber, [_scoreCard bestTime]);
- for (NSString *time in [_scoreCard allTimes]) {
- NSLog(@"%@", time);
- }
- }
- @end
- //
- // Roster.h
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import <Foundation/Foundation.h>
- @class Athlete;
- //遵循归档NSCoding协议
- @interface Roster : NSObject<NSCoding>
- {
- NSMutableArray *_athletes;
- int _rank;
- }
- @property (retain) NSMutableArray *athletes;
- @property int rank;
- - (void)create;
- - (void)print;
- - (void)addAthlete:(Athlete *)athlete;
- @end
- //
- // Roster.m
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import "Roster.h"
- #import "ScoreCard.h"
- #import "Athlete.h"
- static NSString *names [] = { @"John Doe",
- @"Jane Doe", @"Shaun White", @"Jeff Beck",
- @"Eric Clapton", @"Angus Young", @"Flavius Josephus" };
- @implementation Roster
- @synthesize athletes = _athletes, rank = _rank;
- - (void)dealloc
- {
- [_athletes release];
- [super dealloc];
- }
- - (void)create
- {
- NSMutableArray *scoreArray = [NSMutableArray arrayWithObjects:@"21:32:21", @"12:48:11", @"16:11:32", nil nil];
- for(int i = 0; i < 7; ++i){
- Athlete *athlete = [[Athlete alloc] init];
- athlete.name = names[i];
- athlete.bio = @"I'm a boss";
- [athlete setPhoneNumber:@"321-3241"];
- athlete.scoreCard.bestTime = @"12:30:22";
- athlete.scoreCard.allTimes = scoreArray;
- [self addAthlete:athlete];
- [athlete release];
- }
- }
- - (id)init
- {
- if (self = [super init]) {
- _rank = 0;
- _athletes = [[NSMutableArray alloc] init];
- }
- return self;
- }
- //解码方法
- - (id)initWithCoder:(NSCoder *)aDecoder
- {
- if (self = [super init]) {
- _athletes = [[aDecoder decodeObjectForKey:@"athletes"] retain];
- //解码int类型变量
- _rank = [aDecoder decodeIntForKey:@"rank"];
- }
- return self;
- }
- - (void)encodeWithCoder:(NSCoder *)aCoder
- {
- [aCoder encodeObject:_athletes forKey:@"athletes"];
- [aCoder encodeInt:_rank forKey:@"rank"];
- }
- - (void)addAthlete:(Athlete *)athlete
- {
- [_athletes addObject:athlete];
- }
- - (void)print
- {
- NSLog(@"Roster info:\nRank: %d", _rank);
- for (Athlete *athlete in _athletes) {
- NSLog(@"%@", [athlete name]);
- }
- }
- @end
在main函数里面进行归档
- //
- // main.m
- // ArchiverDemo
- //
- // Created by swplzj on 13-11-19.
- // Copyright (c) 2013年 swplzj. All rights reserved.
- //
- #import <UIKit/UIKit.h>
- #import "Roster.h"
- #define ARCHIVE 0
- #define UNARCHIVE 1
- int main(int argc, charchar *argv[])
- {
- NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
- //获得根路径
- NSString *homePath = [[NSBundle mainBundle] executablePath];
- //按照“/”分解字符串到数组
- NSArray *strings = [homePath componentsSeparatedByString:@"/"];
- //
- NSString *executbleName = [strings objectAtIndex:[strings count] - 1];
- NSString *baseDirectory = [homePath substringToIndex:[homePath length] - [executbleName length] - 1];
- //文件名字
- NSString *fileName = [NSString stringWithFormat:@"%@/roster.archive", baseDirectory];
- NSLog(@"filePath: %@", fileName);
- #if ARCHIVE
- //创建并归档一个roster
- Roster *roster = [[Roster alloc] init];
- [roster create];
- //把对象写到二进制流中去
- [NSKeyedArchiver archiveRootObject:roster toFile:fileName];
- [roster release];
- #endif
- #if UNARCHIVE
- //已经写入到磁盘,直接从二进制流读取对象
- Roster *unarchive = [NSKeyedUnarchiver unarchiveObjectWithFile:fileName];
- [unarchive print];
- for (Athlete *athlete in [unarchive athletes]) {
- [athlete print];
- }
- [unarchive release];
- #endif
- [pool release];
- return 0;
- }
/Users/issuser/Library/Application Support/iPhone Simulator/6.1/Applications/74C8943C-BE5F-4BB7-8385-8E922AF29589/ArchiverDemo.app/roster.archive
这就是使用归档来达到数据的持久化。你也来试试吧。
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