[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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