iOS数据持久化（一）

    //获取沙盒主目录    NSString *path = NSHomeDirectory();    NSLog(@"%@",path);

//Documents  存放的一些比较重要的文件，但是存入Documents中的文件不能过大    //如何获取Documents文件目录    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    NSLog(@"%@",documentsPath);    //用firstobject取值是因为该方法一开始使用mac端OS X开发，对于PC端用户可以有多个用户，所以可以取到很多user的路径，但是该方法现在用于手机开发，手机端只有一个用户，所以获得的用户只有一个，lastobject也是可以的。        //Library:是一个资源库，存储一些不太重要的数据，相对比较大一些，里边有两个子文件夹；    NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)firstObject];    //Caches:缓存文件，图片缓存，音频，视频。网页资源。应用程序清除缓存，就是清除该文件夹    NSString *cachesPath  = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)firstObject];    //Preferences:系统偏好设置，用户对应程序的设置，比如用户名和用户密码，preference路径无法找到，通过NSUserDefaults        //temp:存放临时文件，比如下载的压缩包zip，解压后理解把压缩包删除    NSString *tempPath = NSTemporaryDirectory();    NSLog(@"%@",tempPath);    //bundle:ios8之前，包和沙河在同一个目录下，之后.app单独存储到一个独立的文件目录下。 .app 文件 readOnly。从appStore下载下来的是这个包，程序上传的时候也是这个包    NSString *bundlepath = [[NSBundle mainBundle] bundlePath];    NSLog(@"%@",bundlepath);

    // NSSearchPathDirectory 这个类是用来查找文件目录的    //第一个参数：文件名称    //第二个参数，确定搜索域    //第三个参数：确定相对路径还是绝对路径。YES绝对，NO相对

/** *  文件删除 */- (void)deleteFile {    NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];     NSString *imagePath = [cachesPath stringByAppendingPathComponent:@"iamge"];    NSLog(@"%@",imagePath);    //创建文件管理者    NSFileManager *fileManager =  [NSFileManager defaultManager];    //判断文件是否存在    BOOL isExist = [fileManager fileExistsAtPath:imagePath];    if (!isExist) {        BOOL isSuccess = [fileManager createDirectoryAtPath:imagePath withIntermediateDirectories:YES attributes:nil error:nil];        NSLog(@"%@",isSuccess ? @"创建成功" : @"创建失败");    }    //删除文件    if ([fileManager fileExistsAtPath:imagePath]) {        BOOL isSucess = [fileManager removeItemAtPath:imagePath error:nil];        NSLog(@"%@",isSucess ? @"删除成功" : @"删除失败");    }}

/** *  移动 */- (void)moveFile {    NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];        NSString *imagePath = [cachesPath stringByAppendingPathComponent:@"iamge"];    NSLog(@"%@",imagePath);    //创建文件管理者    NSFileManager *fileManager =  [NSFileManager defaultManager];    //判断文件是否存在    BOOL isExist = [fileManager fileExistsAtPath:imagePath];    if (!isExist) {        BOOL isSuccess = [fileManager createDirectoryAtPath:imagePath withIntermediateDirectories:YES attributes:nil error:nil];        NSLog(@"%@",isSuccess ? @"创建成功" : @"创建失败");    }    //删除文件    //    if ([fileManager fileExistsAtPath:imagePath]) {    //        BOOL isSucess = [fileManager removeItemAtPath:imagePath error:nil];    //        NSLog(@"%@",isSucess ? @"删除成功" : @"删除失败");    //    }    //拷贝文件    //    把包中的plist文件拷贝到image文件夹下    NSString *plistInBundlePath = [[NSBundle mainBundle] pathForResource:@"NB.plist" ofType:nil];        NSString *nBPath = [imagePath stringByAppendingPathComponent:@"NB.plist"];    // 拷贝，    if (![fileManager fileExistsAtPath:nBPath]) {        BOOL isSuccess = [fileManager copyItemAtPath:plistInBundlePath toPath:nBPath error:nil];        NSLog(@"%@",isSuccess ? @"拷贝成功" : @"拷贝失败");    }        NSString *toPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];    BOOL isSuccess = [fileManager moveItemAtPath:nBPath toPath:[toPath stringByAppendingPathComponent:@"NB.plist"] error:nil];    NSLog(@"%@",isSuccess ? @"移动成功" : @"移动失败");    }

//字符串写入文件- (void)writeToFile {    //简单对象写入文件：字符串，数组，字典，二进制流 只有这些简单对象支持文件的写入    //如果要写入的文件数据时数组，字典，必须要保证数组，字典中的数据 也是简单对象（如果是复杂对象，请参照后边的归档，反归档）    //将字符串写入Documents文件夹下    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];    NSString *toPath = [documentsPath stringByAppendingPathComponent:@"string.txt"];    NSString *string = @"string-string-string-";    //第一个参数，要写入的文件路径，如果不存在文件，会自动创建    第二个参数，原子性，判断是否需要生成辅助文件，保护在多线程下安全    第三个参数，编码格式    第四个参数，错误信息    NSError *error = nil;    BOOL isSuccess = [string writeToFile:toPath atomically:YES encoding:NSUTF8StringEncoding error:&error];    NSLog(@"%@",isSuccess ? @"写入成功" : @"写入失败");        NSString *str = [NSString stringWithContentsOfFile:toPath encoding:NSUTF8StringEncoding error:nil];    NSLog(@"%@",str);}

//数组写入文件- (void)writeArray {        NSString *str = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)firstObject];    NSString *toPath = [str stringByAppendingPathComponent:@"array.txt"];    NSArray *array = @[@"123",@"123"];    BOOL isSuccess = [array writeToFile:toPath atomically:YES];    NSLog(@"%@",isSuccess ? @"写入成功" : @"写入失败");        NSArray *arr = [NSArray arrayWithContentsOfFile:toPath];    NSLog(@"%@",arr);}

//字典写入文件- (void)writeDic {    NSDictionary *dic = @{@"key":@"value"};    NSString *str = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)firstObject];    NSString *toPath = [str stringByAppendingPathComponent:@"dictonry.txt"];    BOOL isSuccess = [dic writeToFile:toPath atomically:YES];    NSLog(@"%@",isSuccess ? @"成功" : @"失败");    NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:toPath];    NSLog(@"%@",dict);}

//NSData写入文件- (void)writeData {    NSString *tempPath = NSTemporaryDirectory();    NSString *toPath = [tempPath stringByAppendingPathComponent:@"data.txt"];    NSString *string = @"datadata";    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];    BOOL isSuccess = [data writeToFile:toPath atomically:YES];    NSLog(@"%@",isSuccess ? @"成功" : @"失败");    NSData *getData = [NSData dataWithContentsOfFile:toPath];    NSString *str = [[NSString alloc] initWithData:getData encoding:NSUTF8StringEncoding];    NSLog(@"%@",str);}

//Preference- (void)writeToPreference {    // NSUserDefaults 继承自NSObject ,单例     通过kvc模式赋值    NSLog(@"%@",NSHomeDirectory());    //创建用户索引对象    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];    [defaults setInteger:100 forKey:@"money"];    //立即同步操作      对preference中的文件进行修改后，立即同步    [defaults synchronize];    NSInteger money = [defaults integerForKey:@"money"];    NSLog(@"%ld",money);    [defaults setInteger:10000 forKey:@"MyMoney"];    [defaults synchronize];        NSInteger you = [defaults integerForKey:@"you"];    NSLog(@"%ld",(long)you);    if (money < 10) {        NSLog(@"there is no money");    } else {        NSLog(@"-100");        money -= 100;        [defaults setInteger:40 forKey:@"money"];        [defaults setInteger:1000 forKey:@"YourMoney"];    }    // NSUserDefaults 一般存储一些比较小的数据，大部分用来存数值        //例子：判断用户是否第一次登陆    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];    BOOL isFirst = [userDefault boolForKey:@"isFirst"];    [userDefault setBool:YES forKey:@"isFirst"];    [userDefault synchronize];    if (!isFirst) {        NSLog(@"第一次登陆");    } else {        NSLog(@"不是第一次登陆");    }}

////  Person.h//  07.24-DataPersistiser////  Created by lanouhn on 14/7/24.//  Copyright (c) 2014年 LCD. All rights reserved.//#import <Foundation/Foundation.h>@interface Person : NSObject <NSCoding>@property (nonatomic, copy) NSString *name;@property (nonatomic, copy) NSString *gender;@property (nonatomic, assign) NSInteger age;@end

////  Person.m//  07.24-DataPersistiser////  Created by lanouhn on 14/7/24.//  Copyright (c) 2014年 LCD. All rights reserved.//#import "Person.h"@implementation Person//当要归档时，对象会自动触发这个方法- (void)encodeWithCoder:(NSCoder *)aCoder {    [aCoder encodeObject:self.name forKey:@"name"];    [aCoder encodeObject:self.gender forKey:@"gender"];    [aCoder encodeObject:@(self.age) forKey:@"age"];}- (id)initWithCoder:(NSCoder *)aDecoder {    self = [super init];    if (self) {        self.name = [aDecoder decodeObjectForKey:@"name"];        self.gender = [aDecoder decodeObjectForKey:@"gender"];        self.age = [[aDecoder decodeObjectForKey:@"age"] integerValue];    }    return self;}@end

- (void)archiver {        //把复杂文件写入文件，先转化为nsdata对象    //归档：归档的实质就是把其他类型的数据（person），先转化为NSData,再写入文件。    Person *person = [[Person alloc] initWithName:@"rose" gender:@"girl" age:25];    //    NSKeyedArchiver  压缩工具类，继承自NSCoder，主要用于编码    NSMutableData *data = [NSMutableData data] ;    NSKeyedArchiver *achiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    //使用压缩工具讲Person压到data中    [achiver encodeObject:person forKey:@"person"];    //完成压缩，停掉压缩工具    [achiver finishEncoding];        NSString *homePath = NSHomeDirectory();    NSString *toPath = [homePath stringByAppendingPathComponent:@"person.txt"];    BOOL isSuccess = [data writeToFile:toPath atomically:YES];    NSLog(@"%@",isSuccess ? @"成功" : @"失败");        //复杂对象的读取，反归档    //    NSKeyedUnarchiver    NSData *getData = [NSData dataWithContentsOfFile:toPath];    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:getData];    //解压    Person *p1 = [unArchiver decodeObjectForKey:@"person"];    [unArchiver finishDecoding];}

 //集合NSArray NSDictionary 如果想进行归档和反归档，那么它里边存储的元素也要遵循NSCoding协议    Person *person1 = [[Person alloc] initWithName:@"jack" gender:@"男" age:20];    Person *person2 = [[Person alloc] initWithName:@"rose" gender:@"女" age:20];    NSArray *array = @[person1,person2];        NSMutableData *data = [NSMutableData data];        NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    [archiver encodeObject:array forKey:@"array"];    [archiver finishEncoding];        NSString *tmpPath = NSTemporaryDirectory();    NSString *toPath = [tmpPath stringByAppendingString:@"array.txt"];        BOOL isSuccess = [data writeToFile:toPath atomically:YES];    NSLog(@"%@",isSuccess ? @"成功" : @"失败");    //反归档    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];    NSArray *unArchiverArray = [unArchiver decodeObjectForKey:@"array"];