UI16_数据持久化

<pre name="code" class="objc">//
//  AppDelegate.m
//  UI16_数据持久化
//
//  Created by dllo on 15/8/19.
//  Copyright (c) 2015年 flg. All rights reserved.
//

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end

//
//  ViewController.h
//  UI16_数据持久化
//
//  Created by dllo on 15/8/19.
//  Copyright (c) 2015年 flg. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

//
//  ViewController.m
//  UI16_数据持久化
//
//  Created by dllo on 15/8/19.
//  Copyright (c) 2015年 flg. All rights reserved.
//

#import "ViewController.h"
#import "Student.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

///苹果手机为了保证自己数据上的绝对安全,设计了沙盒文件,每一个程序都配备了自己的沙盒文件,每一次运行,文件夹名字就会变成一个没有任何规律的字符串
///一个参数,,当前前往那一个文件夹,,前往document文件夹用NSDocumentDictionary..64行,,可以前往caches文件夹 68行...
///第二个参数,访问的文件夹类型,,,制定访问的是用户名文件夹
///第三个参数,,绝对路径[yes],相对路径[no].
//绝对路径是给系统来使用的,系统可以根据当前的路径找到文件夹,,我们在操作文件的时候都是用的绝对路径,,
//相对路径只会把要前往的文件夹显示,,其他部分都是~,,告诉程序员要去哪个文件夹
/// NSArray *sandBox=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, NO);
// NSLog(@"%@",sandBox);
//沙盒里一共有三个文件
//1.是Document文件,,,:主要是用来存储用户想要存储的一些信息,,比如收藏的信息或者自己设置的一些内容,,所以我们做收藏功能就是前往这个文件夹里写文件...
//2.Library文件夹了是方便程序员使用的,,主要操作他里面的两个文件夹,, caches和Preferences..
//caches用来保存缓存的文件,,SDWebImage会把图片添加到缓存文件夹,清除缓存功能就是删除这个文件夹
//Preferences一般用来保存程序员设置的信息,,,比如NSUserDefaults 就会把数据保存在这个文件夹
//3.tmp文件:一般存放临时内容
//之前在沙盒里还有一个.app文件..在新版本里已经被移走了..
//ba简单的对象写入到本地 NSString..NSArry,,
//1.先通过数组获取沙盒路径,,
/// NSArray *sandBox1=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//从数组中获取沙盒路径.
///NSString *sandboxPath=sandBox1[0];
//要给写入的文件拼接一个路径,拼接方式有两种..
//第一种..要自己添加斜杠
//NSString *documentPath=[sandboxPath stringByAppendingString:@"/顾宇.txt"];
//第二种,,自带斜杠
///NSString *documentPath=[sandboxPath stringByAppendingPathComponent:@"顾宇.plist"];
/////NSLog(@"%@",documentPath);
///NSString *str=@"kdfglkj.,.,.gfhfdhdfghghgfhfghfghfghfggfgfghghgh";
//把字符串写入到本地
//第一个参数:文件要保存的路径
//第二个参数;对文件进行保护,,yes
//第三个参数;编码
//第四个参数;错误信息

/// [str writeToFile:documentPath atomically:YES encoding:NSUTF8StringEncoding error:nil];

//如果路径下有对应的文件,,则会把原来的文件覆盖,,如果没有,则会创建一个新的文件
//把沙盒文件读出来
//    NSString *tempStr=[NSString stringWithContentsOfFile:documentPath encoding:NSUTF8StringEncoding error:nil];
//    NSLog(@"%@",tempStr);

///把数组写入到本地

//    NSArray *sandBox=@[@"1",@"2",@"3",@"4"];
//    //通过数组,,获取沙盒地址..
//    NSArray *sandBox1=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    //用字符串保存沙盒路径
//    NSString *documentPath=sandBox1[0];
//    //给要写入的文件拼接路径
//    NSString *documentPath1=[documentPath stringByAppendingPathComponent:@"sadfsdf.txt" ];
//    [sandBox writeToFile:documentPath1 atomically:YES];
//    NSLog(@"%@",documentPath1);
//    //把数组读出来
//    NSArray *temp=[NSArray arrayWithContentsOfFile:documentPath1];
//    NSLog(@"%@",temp);

///字典写入到本地

//    NSDictionary *dic=[NSDictionary dictionaryWithObjectsAndKeys:@"1",@"2",@"3",@"4", nil];
//    NSArray *sandBox=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *documentPth=sandBox[0];
//    NSString *documentPth1=[documentPth stringByAppendingPathComponent:@"经费靠大家观看.txt"];
//    [dic writeToFile:documentPth1 atomically:YES];
//    NSLog(@"%@",documentPth1);
//    //将字典打印
//    NSDictionary *dic1=[NSDictionary dictionaryWithContentsOfFile:documentPth1];
//    NSLog(@"%@",dic1);

///复杂对象写入到本地,主要指我们自己创建的对象写入到本地
//创建一个student对象

//    Student *stu=[Student stuWithName:@"安逸臣" stuSex:@"男" stuAge:@"25" stuHobby:@"打球"];
//    //1.通过数组获取沙盒路径
//    NSArray *sandBox=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    //2.用字符串接受沙盒路径
//    NSString *sandPath=sandBox[0];
//    //3.拼接文件夹路径,这个文件的扩展名是任意的
//    NSString *documentPath=[sandPath stringByAppendingPathComponent:@"学生.avi"];
//    ///对对象进行归档操作
//    //第一个参数:要实施归档的对象
//    //第二个参数:路径
//    [NSKeyedArchiver archiveRootObject:stu toFile:documentPath];
//    NSLog(@"%@",documentPath);
//    //反归档
//    Student *newStu=[NSKeyedUnarchiver unarchiveObjectWithFile:documentPath];
//    NSLog(@"%@",newStu.name);

///创建三个学生
Student *stu1=[Student stuWithName:@"安逸岑" stuSex:@"男" stuAge:@"23" stuHobby:@"玩篮球"];
Student *stu2=[Student stuWithName:@"宁致远" stuSex:@"男" stuAge:@"34" stuHobby:@"踢足球"];
Student *stu3=[Student stuWithName:@"文世轩" stuSex:@"男" stuAge:@"33" stuHobby:@"跳芭蕾"];
NSArray *arr=@[stu1,stu2,stu3];
//归档和反归档操作
NSArray *sandBox=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *sandBoxPath=sandBox[0];
NSString *documentPath=[sandBoxPath stringByAppendingString:@"student.plist"];
[NSKeyedArchiver archiveRootObject:arr toFile:documentPath];
NSLog(@"%@",documentPath);
//反归档,,遍历学生的姓名
NSArray *stuArr=[NSKeyedUnarchiver unarchiveObjectWithFile:documentPath];
for (Student *tempStu in stuArr) {
NSLog(@"%@",tempStu.name);
}

//    for(NSInteger i=0;i<stuArr.count;i++){
//        Student *stu=stuArr[i];
//        NSLog(@"%@",stu.name);
//    }
///NSUserDefaults 一般存放的是小数据,,比如字符串,,他的用法和字典类似
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject:@"123456" forKey:@"password"];
NSArray *arr1=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSLog(@"%@",arr1);
NSLog(@"%@",[defaults objectForKey:@"password"]);

////通过文件管理者对文件夹进行操作
///在document文件夹下创建一个新的文件夹
NSArray *sandArr=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *sandStr=sandArr[0];
//创建一个文件管理者
NSFileManager *manager=[NSFileManager defaultManager];
//给要创建的文件夹拼接一个路径
NSString *newStr=[sandStr stringByAppendingPathComponent:@"顾宇"];
//文件的名字不需要任何扩展名
//通过manager进行文件夹的创建
[manager createDirectoryAtPath:newStr withIntermediateDirectories:YES attributes:nil error:nil];
NSLog(@"%@",newStr);
//向新建的文件夹里写入字符串

NSString *guyu=@"顾宇";
NSString *guyustr=[newStr stringByAppendingPathComponent:@"guyu.txt"];
[guyu writeToFile:guyustr atomically:YES encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@",guyustr);
///移除文件夹
[manager removeItemAtPath:guyustr error:nil];
///移除cache清除缓存
NSArray *cacheArr=NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSLog(@"%@",cacheArr);
NSString *cacheStr=cacheArr[0];
[manager removeItemAtPath:cacheStr error:nil];

}
#pragma mark 总结:数据的持久化的步骤
//1.指定前往哪一个文件夹
//2.用字符串接受路径
//3.拼接文件路径
//4.写入本地或者归档操作
//注:如果是复杂对象归档,要签订nscoding协议,,并实现两个协议方法,,放在数组里的复杂对象归档也要签订协议

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

//
//  Student.h
//  UI16_数据持久化
//
//  Created by dllo on 15/8/19.
//  Copyright (c) 2015年 flg. All rights reserved.
//

#import <Foundation/Foundation.h>
#pragma mark 如果想要实现归档和反归档,,需要先签订一个协议NSCoding

@interface Student : NSObject<NSCoding>
@property(nonatomic,copy)NSString *name;
@property(nonatomic,copy)NSString *sex;
@property(nonatomic,copy)NSString *age;
@property(nonatomic,copy)NSString *hobby;
//针对四条属性写一个自定义的初始化方法和构造器

- (id)initWithstuName:(NSString *)name
stuSex:(NSString *)sex
stuAge:(NSString *)age
stuHobby:(NSString *)hobby;

+(Student *)stuWithName:(NSString *)name
stuSex:(NSString *)sex
stuAge:(NSString *)age
stuHobby:(NSString *)hobby;

@end

//
//  Student.m
//  UI16_数据持久化
//
//  Created by dllo on 15/8/19.
//  Copyright (c) 2015年 flg. All rights reserved.
//

#import "Student.h"

@implementation Student

- (id)initWithstuName:(NSString *)name
stuSex:(NSString *)sex
stuAge:(NSString *)age
stuHobby:(NSString *)hobby{
self=[super init];
if (self) {
self.name=name;
self.sex=sex;
self.age=age;
self.hobby=hobby;
}
return self;
}
+(Student *)stuWithName:(NSString *)name
stuSex:(NSString *)sex
stuAge:(NSString *)age
stuHobby:(NSString *)hobby{
Student *stu=[[Student alloc]initWithstuName:name stuSex:sex stuAge:age stuHobby:hobby];
return stu;
}
#pragma mark 签订玩NSCoding协议之后,,需要实现两个协议方法,,一个是归档时候使用,,另一个是反归档时候使用
- (void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:_name forKey:@"姓名"];
[aCoder encodeObject:_sex forKey:@"性别"];
[aCoder encodeObject:_age forKey:@"年龄"];
[aCoder encodeObject:_hobby forKey:@"爱好"];
//使用encode方法要和数据的类型相匹配
}
- (id)initWithCoder:(NSCoder *)aDecoder{
self=[super init];
if (self) {
//把数据根据之前的key反编译出来
self.name=[aDecoder decodeObjectForKey:@"姓名"];
self.age=[aDecoder decodeObjectForKey:@"年龄"];
self.sex=[aDecoder decodeObjectForKey: @"性别"];
self.hobby=[aDecoder decodeObjectForKey:@"爱好"];
}
return self;
}
@end

//// AppDelegate.h// UI16_数据持久化//// Created by dllo on 15/8/19.// Copyright (c) 2015年 flg. All rights reserved.//#import <UIKit/UIKit.h>@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@end