文件存储的几种方式总结

//
//  ViewController.m
//  fileStore
//
//  Created by LoveQiuYi on 16/1/22.
//  Copyright © 2016年 LoveQiuYi. All rights reserved.
//  文件存储的几种方式总结

#import "ViewController.h"
#import "Person.h"
/**
*  宏定义文件名以及文件存储的路径
*
*  @param NSDocumentDirectory 文件的主目录
*  @param NSUserDomainMask    用户目录
*  @param YES
*  @return 应用程序沙盒路径
*  注意和直接获取NSHomeDirectory()->return NSString的区别：后面这个值获取到沙盒路径的根目录，上面的获取到document目录下
*/
#define dataName @"data.plist"
#define filePath [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:dataName]
#define archiverPath [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"data.archiver"]
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//plist文件的存储方式
//[self plistStore];
//[self userDefaultStore];
[self archiverData];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//读取偏好设置的数据
NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
//调用objectForKey来获取到数据
NSString * name = [defaults objectForKey:@"name"];
BOOL isMale = [defaults boolForKey:@"isMale"];
NSLog(@"name is %@ and sex is %d",name,isMale);
//GCD保证整个程序运行期间里面的代码只执行一次
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(deleteDefaults) userInfo:nil repeats:YES];
NSLog(@"sdsdsdsd");
});
/**
*  解档
*
*  @return Person对象，读取数据
*/
Person * person = [NSKeyedUnarchiver unarchiveObjectWithFile:archiverPath];
NSLog(@"%@,%ld",person.name,(long)person.age);

}
#pragma mark - plist文件的存储
-(void) plistStore{
//定义一个数据
// NSArray * data = @[@"zhang",@"xin",@"strong"];
NSDictionary * data = @{@"name":@"zhangxin",@"age":@23};
NSString * doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSString * path = [doc stringByAppendingPathComponent:@"data.plist"];
//数据写到文件里面去
[data writeToFile:path atomically:YES];
//注意存储的文件的格式要和输出的格式一致
NSDictionary * dic = [NSDictionary dictionaryWithContentsOfFile:path];
NSLog(@"%@",dic);
}
#pragma mark - 用户偏好设置
-(void) userDefaultStore{
//创建偏好设置
NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
//设置数据
[defaults setObject:@"zhangxin" forKey:@"name"];
[defaults setBool:YES forKey:@"isMale"];
/**
*  立刻写入磁盘存起来，因为用户偏好设置存数据是根据时间戳定时的把缓存数据写到磁盘，如果要立即写进去，要用synchonize
*/
[defaults synchronize];

}
#pragma mark - 删除数据
-(void) deleteDefaults{
NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
[defaults removeObjectForKey:@"isMale"];
[defaults synchronize];
//NSLog(@"name is %@ and sex is %d",name,isMale);

}

#pragma mark - 归档

(void) archiverData{
Person * person = [[Person alloc]init];
person.name = @"zhangxin";
person.age = 20;
[NSKeyedArchiver archiveRootObject:person toFile:archiverPath];
}
@end