ios中文件存取

// 获取沙盒主目录路径
NSString *homeDir = NSHomeDirectory();
// 获取Documents目录路径
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];
// 获取Caches目录路径
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDir = [paths objectAtIndex:0];
// 获取tmp目录路径
NSString *tmpDir =  NSTemporaryDirectory();

#import "ViewController.h"
@interface ViewController ()
@end
@implementationViewController
- (void)viewDidLoad 
{
    [super viewDidLoad];
    // Do any additional setup after loading the view,typically from a nib.
    [self mainOperation];
}
- (void)mainOperation
{
    //获取沙盒中缓存文件夹路径
    //方法一
    //沙盒主目录
    NSString *homePath = NSHomeDirectory();
    //拼接路径
    NSString *path = [homePath stringByAppendingPathComponent:@"Library/Caches"];
    
    //方法二
    //第一个参数目标文件夹目录（NSCachesDirectory查找缓存文件夹），第二个参数为查找目录的域（NSUserDomainMask为在用户目录下查找），第三个参数为结果中主目录是否展开，不展开则显示为~
    NSArray *arr = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    //虽然该方法返回的是一个数组，但是由于一个目标文件夹只有一个目录，所以数组中只有一个元素。
    NSString *cachePath = [arr lastObject];
    //或者
//    NSString *cachePath = [arr objectAtIndex:0];
   
/**
    //获取沙盒中Document文件夹或者tmp文件夹路径都可使用上面两种方法
    //tmp文件夹路径可直接这样获取
    NSString *tmpPath = NSTemporaryDirectory();
    NSLog(@"%@",tmpPath);
**/
    
    //拼接路径（目标路径），这个时候如果目录下不存在这个lotheve.plist文件，这个目录实际上是不存在的。
    NSString *filePath = [cachePath stringByAppendingPathComponent:@"tese.plist"];
    NSLog(@"%@",filePath);
    
    //创建数据
    NSDictionary *content = @{@"字典数据测试1":@"1",@"字典数据测试2":@"2",@"字典数据测试":@"3"};
    //将数据存到目标路径的文件中(这个时候如果该路径下文件不存在将会自动创建)
    //用writeToFile方法写文件会覆盖掉原来的内容
    [content writeToFile:filePath atomically:YES];
   
    //读取数据(通过字典的方式读出文件中的内容)
    NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:filePath];
    NSLog(@"%@",dic);
}
@end

#import "LXXViewController.h"
@interface LXXViewController ()
@end
@implementationLXXViewController
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"NSUserDefaults Demo";
}
//点击button保存数据
- (IBAction)saveData:(id)sender {
    //获取NSUserDefaults对象
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    //存数据，不需要设置路劲，NSUserDefaults将数据保存在preferences目录下
    [userDefaults setObject:@"Lotheve" forKey:@"name"];
    [userDefaults setObject:@"NSUserDefaults" forKey:@"demo"];
    //立刻保存（同步）数据（如果不写这句话，会在将来某个时间点自动将数据保存在preferences目录下）
    [userDefaults synchronize];
    NSLog(@"数据已保存");
}
//点击button读取数据
- (IBAction)getData:(id)sender
{
    //获取NSUserDefaults对象
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    //读取数据
    NSString *name  = [userDefaults objectForKey:@"name"];
    NSString *demo = [userDefaults objectForKey:@"demo"];
    //打印数据
    NSLog(@"name = %@ demo =%@",name,demo);
}
@end

//
//  Person.h
//  FoundationFramework
//
//  Created by Kenshin Cui on 14-2-16.
//  Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Person : NSObject<NSCoding>

@property (nonatomic,copy) NSString *name;
@property (nonatomic,assign) int age;
@property (nonatomic,assign) float height;
@property (nonatomic,assign) NSDate *birthday;

@end

//
//  Person.m
//  FoundationFramework
//
//  Created by Kenshin Cui on 14-2-16.
//  Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "Person.h"

@implementation Person

#pragma mark 解码
-(id)initWithCoder:(NSCoder *)aDecoder{
    NSLog(@"decode...");
    if (self=[super init]) {
        self.name=[aDecoder decodeObjectForKey:@"name"];
        self.age=[aDecoder decodeInt64ForKey:@"age"];
        self.height=[aDecoder decodeFloatForKey:@"heiht"];
        self.birthday=[aDecoder decodeObjectForKey:@"birthday"];
    }
    return self;
}

#pragma mark 编码
-(void)encodeWithCoder:(NSCoder *)aCoder{
    NSLog(@"encode...");
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeInt64:_age forKey:@"age" ];
    [aCoder encodeFloat:_height forKey:@"height"];
    [aCoder encodeObject:_birthday forKey:@"birthday"];

}

#pragma mark 重写描述
-(NSString *)description{
    NSDateFormatter *formater1=[[NSDateFormatter alloc]init];
    formater1.dateFormat=@"yyyy-MM-dd";
    return [NSString stringWithFormat:@"name=%@,age=%i,height=%.2f,birthday=%@",_name,_age,_height,[formater1 stringFromDate:_birthday]];
}

@end

//
//  main.m
//  FoundationFramework
//
//  Created by Kenshin Cui on 14-2-16.
//  Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Person.h"


int main(int argc,char *argv[]){

    //归档
    Person *person1=[[Person alloc]init];
    person1.name=@"Kenshin";
    person1.age=28;
    person1.height=1.72;
    NSDateFormatter *formater1=[[NSDateFormatter alloc]init];
    formater1.dateFormat=@"yyyy-MM-dd";
    person1.birthday=[formater1 dateFromString:@"1986-08-08"];
    
    NSString *path1=@"/Users/kenshincui/Desktop/person1.arc";
    
    [NSKeyedArchiver archiveRootObject:person1 toFile:path1];

    //解档
    Person *person2= [NSKeyedUnarchiver unarchiveObjectWithFile:path1];
    NSLog(@"%@",person2);
    /*结果：
     name=Kenshin,age=28,height=0.00,birthday=1986-08-08
     */
    
    return 0;
}