【Objective-C】OC中自定义对象的归档基本概念和使用方法(实现NSCoding协议)

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平时使用中，我们通常需要通过对自定义对象进行归档处理，自定义对象要进行归档,需要去实现NSCoding协议.

NSCoding协议有两个方法，encodeWithCoder方法对对象的属性数据做编码处理。

initWithCoder方法解码归档数据来进行初始化对象。

实现NSCoding协议后，就能通过NSKeyedArchiver进行归档

下面来看下例子代码:

Person.h头文件代码:

#import <Foundation/Foundation.h>@interface Person : NSObject <NSCoding>@property(nonatomic,copy)NSString *name;@property(nonatomic,copy)NSString *email;@property(nonatomic,copy)NSString *password;@property(nonatomic,assign)int age;@end

Person.m实现代码:

#import "Person.h"#define AGE @"age"#define NAME @"name"#define EMAIL @"email"#define PASSWORD @"password"@implementation Person//对对象属性进行编码方法- (void)encodeWithCoder:(NSCoder *)aCoder{    [aCoder encodeInt:_age forKey:AGE];    [aCoder encodeObject:_name forKey:NAME];    [aCoder encodeObject:_email forKey:EMAIL];    [aCoder encodeObject:_password forKey:PASSWORD];}//对对象属性进行解码方法- (id)initWithCoder:(NSCoder *)aDecoder{    self=[super init];    if (self!=nil) {        _age=[aDecoder decodeIntForKey:AGE];        _name=[[aDecoder decodeObjectForKey:NAME]copy];        _email=[[aDecoder decodeObjectForKey:EMAIL]copy];        _password=[[aDecoder decodeObjectForKey:PASSWORD]copy];            }    return self;}-(void)dealloc{    [_name release];    [_email release];    [_password release];    [super dealloc];}

main.m函数代码:

#import <Foundation/Foundation.h>#import "Person.h"int main(int argc, const char * argv[]){    @autoreleasepool {        Person *person=[[Person alloc]init];        person.name=@"jack";        person.age=20;        person.email=@"jack@163.com";        person.password=@"12345";        NSString *homePath=NSHomeDirectory();        NSString *srcPath=[homePath stringByAppendingPathComponent:@"Desktop/person.archiver"];        BOOL success=[NSKeyedArchiver archiveRootObject:person toFile:srcPath];        if (success) {            NSLog(@"归档自定义对象成功.");        }                //还原数据        Person *result= [NSKeyedUnarchiver unarchiveObjectWithFile:srcPath];        NSLog(@"name=%@",result.name);        NSLog(@"age=%d",result.age);        NSLog(@"email=%@",result.email);        NSLog(@"password=%@",result.password);    }    return 0;}

运行截图:

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