iOS歸檔解檔

標籤：

使用NSKeyedArichiver進行歸檔、NSKeyedUnarchiver進行接檔，這種方式會在寫入、讀出資料之前對資料進行序列化、還原序列化操作。

 

1.對單個字串歸檔

　　//擷取根目錄    NSString *homeDictionary = NSHomeDirectory();    //添加儲存的檔案名稱    NSString *homePath  = [homeDictionary stringByAppendingPathComponent:@"myText.txt"];        //歸檔一個字串---返回是否成功的標誌    BOOL flag = [NSKeyedArchiver archiveRootObject:@"歸檔字串內容..." toFile:homePath];    if (flag)    {        NSLog(@"歸檔成功!!!");        //將字串從歸檔內容中解檔出來       NSString *str = [NSKeyedUnarchiver unarchiveObjectWithFile:homePath];        NSLog(@"%@",str);    }else    {        NSLog(@"歸檔失敗!!!");    }

/*對當個的數組或者字典歸檔的時候  他們內部包含的對象必須都實現了NSCoding協議才能歸檔成功*/

 

 

2.對多種不同類型的資料同時歸檔

//一個CGPoint點、字串、整數（當然很多類型都可以的，例如UIImage、float等等）    //準備資料    CGPoint point = CGPointMake(1.0, 2.0);    NSString *string = @"座標原點";    NSInteger number = 10;    NSString *multiHomePath = [NSHomeDirectory() stringByAppendingPathComponent:@"yyehdh.archiver"];    NSMutableData *data = [[NSMutableData alloc]init];    NSKeyedArchiver *archvier = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];    //對多個對象進行歸檔    [archvier encodeCGPoint:point forKey:@"kPoint"];    [archvier encodeObject:string forKey:@"kInfo"];    [archvier encodeInteger:number forKey:@"kValue"];    //調用歸檔結束關閉函數    [archvier finishEncoding];    //將資料歸檔--返迴歸檔成功與否的標誌    BOOL flag = [data writeToFile:multiHomePath atomically:YES];    if (flag)    {        NSLog(@"資料歸檔成功!!!!");        //從剛才歸檔的檔案將將資料讀取出來        NSMutableData *dataR = [[NSMutableData alloc]initWithContentsOfFile:multiHomePath];        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:dataR];        //對資料進行解檔 得到相應的資料類型的資料(和歸檔的時候相同的資料類型)        CGPoint pointR = [unarchiver decodeCGPointForKey:@"kPoint"];        NSString *infoR = [unarchiver decodeObjectForKey:@"kInfo"];        NSInteger valueR = [unarchiver decodeIntegerForKey:@"kValue"];        //調用解檔結束關閉函數        [unarchiver finishDecoding];        NSLog(@"%f,%f,%@,%ld",pointR.x,pointR.y,infoR,(long)valueR);    }else    {        NSLog(@"歸檔失敗!!!!");    }

3.自訂對象歸檔

操作步驟

 

歸檔：

 

1.使用NSData執行個體作為歸檔的儲存資料

 

2.添加歸檔的內容---使用索引值對

 

3.完成歸檔

 

解歸檔：

 

1.從磁碟讀取檔案，產生NSData執行個體

 

2.根據NSData執行個體和初始化解歸檔執行個體

 

3.解歸檔，根據key訪問value

 

////  A.h//  歸檔解檔////  Created by admin on 16/1/18.//  Copyright © 2016年 123. All rights reserved.//#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>@interface A : NSObject<NSCoding>-(instancetype)initWithName:(NSString *)name icon:(UIImage *)anImage age:(NSInteger)age;@property(nonatomic,copy)NSString *name;@property(nonatomic,assign)NSInteger age;@property(nonatomic,copy)UIImage *icon;@end

////  A.m//  歸檔解檔////  Created by admin on 16/1/18.//  Copyright © 2016年 123. All rights reserved.//#import "A.h"#define kNameKey @"NameKey"#define kAgeKey @"AgeKey"#define KIconKey @"IconKey"@implementation A-(instancetype)initWithName:(NSString *)name icon:(UIImage *)anImage age:(NSInteger)age;{    if (self = [super init])    {        self.name = name;        self.age = age;        self.icon = anImage;    }    return self;}/* 【注】：要將一個自訂的類進行歸檔，那麼類裡面的每個屬性都必須是可以被歸檔的，如果是不能歸檔的類型，我們可以把他轉化為NSValue進行歸檔，然後在讀出來的時候在轉化為相應的類。 */#pragma mark -  通過一個給定的archiver把訊息接收者進行編碼-(void)encodeWithCoder:(NSCoder *)aCoder{    [aCoder encodeObject:_name forKey:kNameKey];    [aCoder encodeInteger:_age forKey:kAgeKey];    [aCoder encodeObject:_icon forKey:KIconKey];}#pragma mark -  從一個給定unarchiver的資料中返回一個初始化對象。- (id)initWithCoder:(NSCoder *)aDecoder{    if (self = [super init])    {        _name = [aDecoder decodeObjectForKey:kNameKey];        _age = [aDecoder decodeIntegerForKey:kAgeKey];        _icon = [aDecoder decodeObjectForKey:KIconKey];    }    return self;}#pragma mark - 返回訊息接收者的一個複製的新執行個體。- (id)copyWithZone:(NSZone *)zone{    A *copy = [[[self class] allocWithZone:zone] init];    copy.name = [self.name copyWithZone:zone];    copy.age = self.age;    copy.icon = self.icon ;    return copy;}@end

NSString *multiHomePath = [NSHomeDirectory() stringByAppendingPathComponent:@"ggdh.archiver"];    A *aPerson = [[A alloc]initWithName:@"zhangsan" icon:[UIImage imageNamed:@"oicon"] age:88];    NSLog(@"%@",[UIImage imageNamed:@"oicon"]);    //歸檔    NSMutableData *data = [[NSMutableData alloc] init];     NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    //A類的  encodeWithCoder 將會被調用    [archiver encodeObject:aPerson forKey:@"ObjArchiverKey"];    [archiver finishEncoding];    //寫入檔案    BOOL flag = [data writeToFile:multiHomePath atomically:YES];    if (flag)    {        NSLog(@"自訂對象歸檔成功!!!");        NSData *data = [[NSMutableData alloc] initWithContentsOfFile:multiHomePath];        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];                //獲得類--解檔自訂的對象        A *readPerson = [unarchiver decodeObjectForKey:@"ObjArchiverKey"];// initWithCoder方法被調用        [unarchiver finishDecoding];        NSLog(@"name:%@ ~~ age:%ld ~~ icon: %@",readPerson.name,readPerson.age,readPerson.icon);    }    else    {        NSLog(@"自訂對象歸檔失敗!!!");    }

 

iOS歸檔解檔