Archive（歸檔）

Archives provide a means to convert objects and values into an architecture-independent stream of bytes that preserves the identity of and the relationships between the objects and values.

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1、歸檔與解檔

Archive

RootObject

[NSKeyedArchiver archiveRootObject:[contentTextField text] toFile:[self archiveFilePath]];

Keyed

NSString *content = [contentTextField text]; NSMutableData *data = [NSMutableData data]; NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; [archiver encodeObject:content forKey:@"content"]; [archiver finishEncoding]; [data writeToFile:[self archiveFilePath] atomically:YES];

Unarchive

Root Object

[contentLabel setText:[NSKeyedUnarchiver unarchiveObjectWithFile:[self archiveFilePath]]];

Keyed

NSData *data = [NSData dataWithContentsOfFile:[self archiveFilePath]]; NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; [contentLabel setText:[unarchiver decodeObjectForKey:@"content"]]; [unarchiver finishDecoding];

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2、NSCoding Protocol

為了支持編碼（encoding）和解碼（decoding），類需要實現NSCoding Protocol。

以類Person為例：

Person.h

#import <Foundation/Foundation.h>#define PERSON_KEY_FIRSTNAME @"FIRSTNAME" #define PERSON_KEY_LASTNAME @"LASTNAME" #define PERSON_KEY_HEIGHT @"HEIGHT"@interface Person : NSObject <NSCoding>@property (nonatomic, retain) NSString *firstName; @property (nonatomic, retain) NSString *lastName; @property (nonatomic, assign) float height;@end

Person.m

#import "Person.h"@implementation Person@synthesize firstName, lastName, height;- (void)encodeWithCoder:(NSCoder *)aCoder {[aCoder encodeObject:self.firstName forKey:PERSON_KEY_FIRSTNAME];[aCoder encodeObject:self.lastName forKey:PERSON_KEY_LASTNAME];[aCoder encodeFloat:self.height forKey:PERSON_KEY_HEIGHT]; }- (id)initWithCoder:(NSCoder *)aDecoder {self = [super init];if (self != nil) {self.firstName = [aDecoder decodeObjectForKey:PERSON_KEY_FIRSTNAME];self.lastName = [aDecoder decodeObjectForKey:PERSON_KEY_LASTNAME];self.height = [aDecoder decodeFloatForKey:PERSON_KEY_HEIGHT];}return self; }@end

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參考：https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/Archiving/Archiving.html

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轉載于:https://www.cnblogs.com/dyingbleed/archive/2013/05/02/3054058.html

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