自定义对象归档、解档

Person.h

#import 

 

@interface Person : NSObject<</span>NSCoding>

 

@property(nonatomic, copy)NSString *name;

@property(nonatomic, assign)int age;

 

@end

Person.m

#import "Person.h"

@implementation Person

// 遵循NSCoding协议

- (void)encodeWithCoder:(NSCoder *)aCoder

{

    //[super encodeWithCoder:aCoder];// 如果其他类继承该类需调用super方法

    [aCoder encodeInt:self.age forKey:@"age"];

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

}

- (id)initWithCoder:(NSCoder *)aDecoder

{

    //[super initWithCoder:aDecoder]; // 如果其他类继承该类需调用super方法

    self.age = [aDecoder decodeIntForKey:@"age"];

    self.name = [aDecoder decodeObjectForKey:@"name"];

    return self;

}

@end

对象归档和解档：

/**

     @ 单对象的存储

     */

    Person *person = [[Person alloc] init];

    person.name = @"xiaoming";

    person.age = 11;

    // document路径

    NSString *path3= [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    // 创建.archiver文件，该后缀名可以随意命名

    NSString *path4 = [path3 stringByAppendingPathComponent:@"person.archiver"];

    // 对象归档

    [NSKeyedArchiver archiveRootObject:person toFile:path4];

    // 解档1

    Person *per = [NSKeyedUnarchiver unarchiveObjectWithFile:path4];

    NSLog(@"%@-%d",per.name,per.age);

    /**

     @ 多对象的存储

     */

    // 对象1

    Person *dahong = [[Person alloc] init];

    dahong.name = @"dahong";

    dahong.age = 33;

    // 对象2

    Person *xiaohua = [[Person alloc] init];

    xiaohua.name = @"xiaohua";

    xiaohua.age = 55;

    // 归档

    NSMutableData *data = [NSMutableData data];

    NSKeyedArchiver *arch = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

    [arch encodeObject:xiaohua forKey:@"person1"];

    [arch encodeObject:dahong forKey:@"person2"];

    [arch finishEncoding]; // 完成编码

    // data写入路径下

    NSString *personPath = [path3 stringByAppendingPathComponent:@"person.data"];

    [data writeToFile:personPath atomically:YES];

    /**

     @ 多对象读取

     */

    NSURL *url = [NSURL fileURLWithPath:personPath];

    //[NSData dataWithContentsOfFile:<#(NSString *)#>]; 此方法也可以

    NSData *undata = [NSData dataWithContentsOfURL:url];

    NSKeyedUnarchiver *unarch = [[NSKeyedUnarchiver alloc] initForReadingWithData:undata];

    Person *unp1 = [unarch decodeObjectForKey:@"person1"];

    Person *unp2 = [unarch decodeObjectForKey:@"person2"];

    // 完成

    [unarch finishDecoding];

    NSLog(@"%@%@",unp1,unp2);

    /**

     @ 归档解档实现对象深copy

     */

    Person *copyPer = [[Person alloc] init];

    copyPer.age = 23;

    copyPer.name = @"aaaa";

    // 转成data

    NSData *copyDa = [NSKeyedArchiver archivedDataWithRootObject:copyPer];

    // 解档

    Person *copyPer2 = [NSKeyedUnarchiver unarchiveObjectWithData:copyDa];

    // 此时copyPer和copyPer2对象内存地址不一样，完成了深copy