[Objective-C] 011_数据持久化_NSKeyedArchiver

在日常开发中对于NSString、NSDictionary、NSArray、NSData、NSNumber这些基本类的数据持久化，可以用属性列表的方法持久化到.plist 文件中。但是一些我们自定义的类的话，属性列表的方法就不能用了，这时候是NSKeyedArchiver出马的时候了。以我们前面写的Person 类为例，看NSKeyedArchiver 如何一展身手。

Person 类

//////////////////     .h     ////////////////

#import <Foundation/Foundation.h>



@interface Person : NSObject<NSCoding>



@property (nonatomic,copy)NSString *name;

@property (nonatomic,assign)int age;

@property (nonatomic,copy)NSString *sex;



- (void)printInfo;

@end



//////////////////     .m    ////////////////

#import "Person.h"



@implementation Person

@synthesize name = _name,sex = _sex;

@synthesize age = _age;



//写入文件

-(void)encodeWithCoder:(NSCoder *)encoder{

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

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

    [encoder encodeObject:self.sex forKey:@"sex"];

}



//从文件中读取

-(id)initWithCoder:(NSCoder *)decoder{

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

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

    self.sex = [decoder decodeObjectForKey:@"sex"];

    return self;

}



- (void)printInfo {

    NSLog(@"我的名字叫：%@ 今年%d岁 我是一名%@ %@",self.name,self.age,self.sex,NSStringFromClass([self class]));

}



@end

AppDelegate.m 中测试

#import "AppDelegate.h"

#import "Person.h"



@interface AppDelegate ()



@end



@implementation AppDelegate



- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {



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

    person.age = 18;

    person.sex = @"男";

    person.name = @"SuperDo.Horse";

    

    //获得Document的路径

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

    NSString *path = [documents stringByAppendingPathComponent:@"person.archiver"];//拓展名可以自定义

    [NSKeyedArchiver archiveRootObject:person toFile:path];

    

    Person *person2 = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

    [person2 printInfo];

    

    return YES;

}



@end

打印结果：　　

2015-07-05 22:37:48.876 Attendance[80142:2069100] 我的名字叫：SuperDo.Horse 今年18岁我是一名男 Person

 

　　

 

 

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转载自【宝宝巴士SuperDo团队】 原文链接: http://www.cnblogs.com/superdo/p/4623177.html