归档存储

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归档注意存储对象一定要遵守NSCoding协议实现其归档和解档方法，对其需要存储对象的属性进行归档和解档.

新建需要存储的对象

Person.h

////  Person.h//  归档和解档////  Created by gaocai on 16/7/18.//  Copyright © 2016年 gaocai. All rights reserved.//#import <Foundation/Foundation.h>@interface Person : NSObject<NSCoding>@property (nonatomic, assign) int age;@property (nonatomic, strong) NSString *name;@end

Person.m

////  Person.m//  归档和解档////  Created by gaocai on 16/7/18.//  Copyright © 2016年 gaocai. All rights reserved.//#import "Person.h"@implementation Person//归档存储- (void)encodeWithCoder:(NSCoder *)aCoder {    [aCoder encodeObject:@"张三" forKey:@"name"];    [aCoder encodeInt:24 forKey:@"age"];}//解档读取- (instancetype)initWithCoder:(NSCoder *)aDecoder {    if (self == [super init]) {        _name = [aDecoder decodeObjectForKey:@"name"];        _age = [aDecoder decodeIntForKey:@"age"];    }    return self;}@end

ViewController.m

////  ViewController.m//  归档和解档////  Created by gaocai on 16/7/18.//  Copyright © 2016年 gaocai. All rights reserved.//#import "ViewController.h"#import "Person.h"@interface ViewController ()@end@implementation ViewController//存- (IBAction)save:(id)sender {    //获得缓存文件路径    NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];    //拼接文件存储全路径    NSString *pathFile =  [cachePath stringByAppendingPathComponent:@"data.txt"];    //需要归档的对象(存储)    Person *p = [[Person alloc] init];    //开始归档 会调用Person对象实现的encodeWithCoder方法   [NSKeyedArchiver archiveRootObject:p toFile:pathFile];  }//取- (IBAction)read:(id)sender {    //获取缓存文件路径    NSString *cacheFile = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];    //拼接全路径    NSString *pathFile = [cacheFile stringByAppendingPathComponent:@"data.txt"];    //解档读取数据 会调用Person对象实现的initWithCoder方法返回一个Person对象    Person *p = [NSKeyedUnarchiver unarchiveObjectWithFile:pathFile];    NSLog(@"%d", p.age);    NSLog(@"%@", p.name);}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

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