数据存储 - 序列化对象 | 宁静至远，博雅多通

变更记录

序号	录入时间	录入人	备注
1	2015-03-02	Alfred Jiang	-
2	2015-12-18	Alfred Jiang	-

方案名称

数据存储 - 序列化对象

关键字

数据存储 \ 序列化对象 \ NSKeyedArchiver \ NSJSONSeriali \ 文件存储

需求场景

需要文件存储对象数据时
部分序列化对象需求

参考链接

GitHub - NSSerialisationTests

详细内容

通过NSKeyedArchiver和NSJSONSeriali的对比测试说明序列化对象的一些基本操作和用途

Model.h

//
//  Model.h
//  Serialisation Test
//
//  Created by Johnnie Walker on 09/05/2013.
//  Copyright (c) 2013 Random Sequence. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Model : NSObject <NSCoding>
@property (nonatomic) NSRect rect;
@property (nonatomic) NSPoint point;
@property (nonatomic, copy) NSString *UUID;

+ (id)model;
- (NSDictionary *)dict;
+ (id)modelWithDictionary:(NSDictionary *)dictionary;

@end

Model.m

//
//  Model.m
//  Serialisation Test
//
//  Created by Johnnie Walker on 09/05/2013.
//  Copyright (c) 2013 Random Sequence. All rights reserved.
//

#import "Model.h"

NSString * const UUIDKey = @"UUID";
NSString * const PointKey = @"point";
NSString * const RectKey = @"rect";

@implementation Model

+ (id)model {
    Model *model = [Model new];
    model.UUID = [[NSUUID UUID] UUIDString];
    model.point = NSMakePoint(arc4random(), arc4random());
    model.rect = NSMakeRect(model.point.x, model.point.y, arc4random(), arc4random());
    return model;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    if ([aCoder allowsKeyedCoding]) {
        [aCoder encodeObject:self.UUID forKey:UUIDKey];
        [aCoder encodePoint:self.point forKey:PointKey];
        [aCoder encodeRect:self.rect forKey:RectKey];
    } else {
        [aCoder encodeObject:self.UUID];
        [aCoder encodePoint:self.point];
        [aCoder encodeRect:self.rect];
    }
}

- (id)initWithCoder:(NSCoder *)decoder {
    self = [super init];
    if (self) {
        if ([decoder allowsKeyedCoding]) {
            self.UUID = [decoder decodeObjectForKey:UUIDKey];
            self.point = [decoder decodePointForKey:PointKey];
            self.rect = [decoder decodeRectForKey:RectKey];
        } else {
            self.UUID = [decoder decodeObject];
            self.point = [decoder decodePoint];
            self.rect = [decoder decodeRect];
        }
    }
    return self;
}

- (NSDictionary *)dict {
    return @{
             UUIDKey: self.UUID,
             PointKey: NSStringFromPoint(self.point),
             RectKey: NSStringFromRect(self.rect)
             };
}

+ (id)modelWithDictionary:(NSDictionary *)dictionary {
    Model *model = [Model new];
    model.UUID = [dictionary objectForKey:UUIDKey];
    model.point = NSPointFromString([dictionary objectForKey:PointKey]);
    model.rect = NSRectFromString([dictionary objectForKey:RectKey]);
    return model;
}

@end

Serialisation_TestTests.m

//
//  Serialisation_TestTests.m
//  Serialisation TestTests
//
//  Created by Johnnie Walker on 09/05/2013.
//  Copyright (c) 2013 Random Sequence. All rights reserved.
//

#import "Serialisation_TestTests.h"
#import "Model.h"

#define ITERATIONS 100000

@interface Serialisation_TestTests ()
@property (nonatomic, strong) NSArray *models;
@end

@implementation Serialisation_TestTests

- (void)setUp {
    NSMutableArray *models = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (NSInteger i=0; i<ITERATIONS; i++) {
        [models addObject:[Model model]];
    }
    self.models = models;
}

- (void)tearDown {
    self.models = nil;
}

- (void)testNSCoding
{
    NSDate *startDate = [NSDate date];
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (Model *model in self.models) {
        [array addObject:[NSArchiver archivedDataWithRootObject:model]];
    }
    NSMutableArray *models1 = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (NSData *data in array) {
        [models1 addObject:[NSUnarchiver unarchiveObjectWithData:data]];
    }
    NSDate *endDate = [NSDate date];

    NSLog(@"NSArchiver models: %li duration: %f", (unsigned long)[models1 count], [endDate timeIntervalSinceDate:startDate]);
}

- (void)testNSKeyedCoding
{
    NSDate *startDate = [NSDate date];
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (Model *model in self.models) {
        [array addObject:[NSKeyedArchiver archivedDataWithRootObject:model]];
    }
    NSMutableArray *models1 = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (NSData *data in array) {
        [models1 addObject:[NSKeyedUnarchiver unarchiveObjectWithData:data]];
    }
    NSDate *endDate = [NSDate date];

    NSLog(@"NSKeyedArchiver models: %li duration: %f", (unsigned long)[models1 count], [endDate timeIntervalSinceDate:startDate]);
}

- (void)testPropertyListSerialisation
{
    NSDate *startDate = [NSDate date];
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (Model *model in self.models) {
        [array addObject:[NSPropertyListSerialization dataWithPropertyList:[model dict] format:NSPropertyListBinaryFormat_v1_0 options:0 error:nil]];
    }
    NSMutableArray *models1 = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (NSData *data in array) {
        [models1 addObject:
         [Model modelWithDictionary:
          [NSPropertyListSerialization propertyListWithData:data
                                                    options:NSPropertyListImmutable
                                                     format:NULL
                                                      error:nil]]];
    }
    NSDate *endDate = [NSDate date];

    NSLog(@"NSPropertyListSerialization models: %li duration: %f", (unsigned long)[models1 count], [endDate timeIntervalSinceDate:startDate]);
}

- (void)testJSONSerialisation
{
    NSDate *startDate = [NSDate date];
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (Model *model in self.models) {
        [array addObject:[NSJSONSerialization dataWithJSONObject:[model dict] options:0 error:nil]];
    }
    NSMutableArray *models1 = [NSMutableArray arrayWithCapacity:ITERATIONS];
    for (NSData *data in array) {
        [models1 addObject:[Model modelWithDictionary:[NSJSONSerialization JSONObjectWithData:data options:0 error:nil]]];
    }
    NSDate *endDate = [NSDate date];

    NSLog(@"NSJSONSerialization models: %li duration: %f", (unsigned long)[models1 count], [endDate timeIntervalSinceDate:startDate]);
}

@end

执行测试结果

Test Case '-[Serialisation_TestTests testJSONSerialisation]' started.
2015-03-02 15:02:50.335 Serialisation Test[37221:303] NSJSONSerialization models: 100000 duration: 2.247854
Test Case '-[Serialisation_TestTests testJSONSerialisation]' passed (2.516 seconds).
Test Case '-[Serialisation_TestTests testNSCoding]' started.
2015-03-02 15:02:53.854 Serialisation Test[37221:303] NSArchiver models: 100000 duration: 2.789287
Test Case '-[Serialisation_TestTests testNSCoding]' passed (2.967 seconds).
Test Case '-[Serialisation_TestTests testNSKeyedCoding]' started.
2015-03-02 15:03:01.146 Serialisation Test[37221:303] NSKeyedArchiver models: 100000 duration: 6.989706
Test Case '-[Serialisation_TestTests testNSKeyedCoding]' passed (7.217 seconds).
Test Case '-[Serialisation_TestTests testPropertyListSerialisation]' started.
2015-03-02 15:03:04.015 Serialisation Test[37221:303] NSPropertyListSerialization models: 100000 duration: 2.544815
Test Case '-[Serialisation_TestTests testPropertyListSerialisation]' passed (2.787 seconds).
Test Suite 'Serialisation_TestTests' finished at 2015-03-02 07:03:04 +0000.
Executed 4 tests, with 0 failures (0 unexpected) in 15.488 (16.354) seconds
Test Suite '/Users/ajiang048/Library/Developer/Xcode/DerivedData/Serialisation_Test-betqttfwfsrkofaxdppxjckonkic/Build/Products/Debug/Serialisation TestTests.octest(Tests)' finished at 2015-03-02 07:03:04 +0000.
Executed 4 tests, with 0 failures (0 unexpected) in 15.488 (16.354) seconds
Test Suite 'All tests' finished at 2015-03-02 07:03:04 +0000.
Executed 4 tests, with 0 failures (0 unexpected) in 15.488 (16.356) seconds

效果图

（无）

备注

NSJSONSerialization 比 NSKeyedArchiver 在速度更快，而且序列化之后的体积更小，推荐优先使用 NSJSONSerialization 方式进行序列化操作