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

//Documents  存放的一些比較重要的文件，但是存入Documents中的文件不能過大    //如何獲取Documents文件目錄    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    NSLog(@"%@",documentsPath);    //用firstobject取值是因為該方法一開始使用mac端OS X開發，對于PC端用戶可以有多個用戶，所以可以取到很多user的路徑，但是該方法現在用于手機開發，手機端只有一個用戶，所以獲得的用戶只有一個，lastobject也是可以的。        //Library:是一個資源庫，存儲一些不太重要的數據，相對比較大一些，里邊有兩個子文件夾；    NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)firstObject];    //Caches:緩存文件，圖片緩存，音頻，視頻。網頁資源。應用程序清除緩存，就是清除該文件夾    NSString *cachesPath  = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)firstObject];    //Preferences:系統偏好設置，用戶對應程序的設置，比如用戶名和用戶密碼，preference路徑無法找到，通過NSUserDefaults        //temp:存放臨時文件，比如下載的壓縮包zip，解壓后理解把壓縮包刪除    NSString *tempPath = NSTemporaryDirectory();    NSLog(@"%@",tempPath);    //bundle:ios8之前，包和沙河在同一個目錄下，之后.app單獨存儲到一個獨立的文件目錄下。 .app 文件 readOnly。從appStore下載下來的是這個包，程序上傳的時候也是這個包    NSString *bundlepath = [[NSBundle mainBundle] bundlePath];    NSLog(@"%@",bundlepath);

    // NSSearchPathDirectory 這個類是用來查找文件目錄的    //第一個參數：文件名稱    //第二個參數，確定搜索域    //第三個參數：確定相對路徑還是絕對路徑。YES絕對，NO相對

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

/** *  移動 */- (void)moveFile {    NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];        NSString *imagePath = [cachesPath stringByAppendingPathComponent:@"iamge"];    NSLog(@"%@",imagePath);    //創建文件管理者    NSFileManager *fileManager =  [NSFileManager defaultManager];    //判斷文件是否存在    BOOL isExist = [fileManager fileExistsAtPath:imagePath];    if (!isExist) {        BOOL isSuccess = [fileManager createDirectoryAtPath:imagePath withIntermediateDirectories:YES attributes:nil error:nil];        NSLog(@"%@",isSuccess ? @"創建成功" : @"創建失敗");    }    //刪除文件    //    if ([fileManager fileExistsAtPath:imagePath]) {    //        BOOL isSucess = [fileManager removeItemAtPath:imagePath error:nil];    //        NSLog(@"%@",isSucess ? @"刪除成功" : @"刪除失敗");    //    }    //拷貝文件    //    把包中的plist文件拷貝到image文件夾下    NSString *plistInBundlePath = [[NSBundle mainBundle] pathForResource:@"NB.plist" ofType:nil];        NSString *nBPath = [imagePath stringByAppendingPathComponent:@"NB.plist"];    // 拷貝，    if (![fileManager fileExistsAtPath:nBPath]) {        BOOL isSuccess = [fileManager copyItemAtPath:plistInBundlePath toPath:nBPath error:nil];        NSLog(@"%@",isSuccess ? @"拷貝成功" : @"拷貝失敗");    }        NSString *toPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];    BOOL isSuccess = [fileManager moveItemAtPath:nBPath toPath:[toPath stringByAppendingPathComponent:@"NB.plist"] error:nil];    NSLog(@"%@",isSuccess ? @"移動成功" : @"移動失敗");    }

//字符串寫入文件- (void)writeToFile {    //簡單對象寫入文件：字符串，數組，字典，二進制流 只有這些簡單對象支持文件的寫入    //如果要寫入的文件數據時數組，字典，必須要保證數組，字典中的數據 也是簡單對象（如果是復雜對象，請參照后邊的歸檔，反歸檔）    //將字符串寫入Documents文件夾下    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];    NSString *toPath = [documentsPath stringByAppendingPathComponent:@"string.txt"];    NSString *string = @"string-string-string-";    //第一個參數，要寫入的文件路徑，如果不存在文件，會自動創建    第二個參數，原子性，判斷是否需要生成輔助文件，保護在多線程下安全    第三個參數，編碼格式    第四個參數，錯誤信息    NSError *error = nil;    BOOL isSuccess = [string writeToFile:toPath atomically:YES encoding:NSUTF8StringEncoding error:&error];    NSLog(@"%@",isSuccess ? @"寫入成功" : @"寫入失敗");        NSString *str = [NSString stringWithContentsOfFile:toPath encoding:NSUTF8StringEncoding error:nil];    NSLog(@"%@",str);}

//數組寫入文件- (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 ? @"寫入成功" : @"寫入失敗");        NSArray *arr = [NSArray arrayWithContentsOfFile:toPath];    NSLog(@"%@",arr);}

//字典寫入文件- (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" : @"失敗");    NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:toPath];    NSLog(@"%@",dict);}

//NSData寫入文件- (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" : @"失敗");    NSData *getData = [NSData dataWithContentsOfFile:toPath];    NSString *str = [[NSString alloc] initWithData:getData encoding:NSUTF8StringEncoding];    NSLog(@"%@",str);}

//Preference- (void)writeToPreference {    // NSUserDefaults 繼承自NSObject ,單例     通過kvc模式賦值    NSLog(@"%@",NSHomeDirectory());    //創建用戶索引對象    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];    [defaults setInteger:100 forKey:@"money"];    //立即同步操作      對preference中的文件進行修改后，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 一般存儲一些比較小的數據，大部分用來存數值        //例子：判斷用戶是否第一次登陸    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];    BOOL isFirst = [userDefault boolForKey:@"isFirst"];    [userDefault setBool:YES forKey:@"isFirst"];    [userDefault synchronize];    if (!isFirst) {        NSLog(@"第一次登陸");    } else {        NSLog(@"不是第一次登陸");    }}

////  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//當要歸檔時，對象會自動觸發這個方法- (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 {        //把復雜文件寫入文件，先轉化為nsdata對象    //歸檔：歸檔的實質就是把其他類型的數據（person），先轉化為NSData,再寫入文件。    Person *person = [[Person alloc] initWithName:@"rose" gender:@"girl" age:25];    //    NSKeyedArchiver  壓縮工具類，繼承自NSCoder，主要用于編碼    NSMutableData *data = [NSMutableData data] ;    NSKeyedArchiver *achiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    //使用壓縮工具講Person壓到data中    [achiver encodeObject:person forKey:@"person"];    //完成壓縮，停掉壓縮工具    [achiver finishEncoding];        NSString *homePath = NSHomeDirectory();    NSString *toPath = [homePath stringByAppendingPathComponent:@"person.txt"];    BOOL isSuccess = [data writeToFile:toPath atomically:YES];    NSLog(@"%@",isSuccess ? @"成功" : @"失敗");        //復雜對象的讀取，反歸檔    //    NSKeyedUnarchiver    NSData *getData = [NSData dataWithContentsOfFile:toPath];    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:getData];    //解壓    Person *p1 = [unArchiver decodeObjectForKey:@"person"];    [unArchiver finishDecoding];}

 //集合NSArray NSDictionary 如果想進行歸檔和反歸檔，那么它里邊存儲的元素也要遵循NSCoding協議    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" : @"失敗");    //反歸檔    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];    NSArray *unArchiverArray = [unArchiver decodeObjectForKey:@"array"];