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