iOS 利用FZEasyFile本地保存和常规保存

1、常规保存（较麻烦）

NSFileManager *fileManager = [NSFileManager defaultManager];

    //获取document路径,括号中属性为当前应用程序独享

    NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentDirectory = [directoryPaths objectAtIndex:0];

    //查找文件夹，如果不存在，就创建一个文件夹

    NSString *dir = [documentDirectory stringByAppendingPathComponent:@SAVEDIR];

    NSLog(@"cache dir %@", dir);

    if(![fileManager fileExistsAtPath:dir])

    {

        if(![fileManager createDirectoryAtPath:dir withIntermediateDirectories:YES attributes:nil error:nil])

        {

            NSLog(@"create dir:(%@) error", dir);

            return;

        }

    }

    //定义记录文件全名以及路径的字符串filePath

    NSString *filePath = [dir stringByAppendingPathComponent:[[NSString alloc]initWithFormat:@"/%@", filename]];

    //查找文件，如果不存在，就创建一个文件

    NSData *data = [lHtml dataUsingEncoding:NSUTF8StringEncoding];

    if (![fileManager fileExistsAtPath:filePath]) {

        [fileManager createFileAtPath:filePath contents:data attributes:nil];

    }

2、FZEasyFile保存
导入的文件：

// FZEasyFile.h

// FZEasyFile

// Created by zhou jun on 14-4-29.

#import <Foundation/Foundation.h>

@interface FZEasyFile : NSObject

/**

singleton pattern.

@return the shared instance.

+ (FZEasyFile *)sharedInstance;

/**

convert the short file name to full file name. e.g. "mycache/user/icon.png" -> "/Users/zhoujun/Library/Application Support/iPhone Simulator/7.1/Applications/ABCE2119-E864-4492-A3A9-A238ADA74BE5/Documents/mycache/user/icon.png".

@return full file name.

- (NSString *)fullFileName:(NSString *)shortFileName;

/**

test if the file exists.

@param fileName file path and file name, e.g. "mycache/user/icon.png".

@return YES if exists, NO otherwise.

- (BOOL)isFileExists:(NSString *)fileName;

/**

create a file

@param fileName fileName file path and file name, e.g. "mycache/user/icon.png".

@param shouldOverwrite YES:if the file exists then overwirte it, NO:if the file exists then do nothing

- (void)createFile:(NSString *)fileName overwrite:(BOOL)shouldOverwrite;

@end

// FZEasyFile.m

// FZEasyFile

// Created by zhou jun on 14-4-29.

#import "FZEasyFile.h"

@implementation FZEasyFile

static FZEasyFile *instance;

+ (FZEasyFile *)sharedInstance {

if (!instance) {

@synchronized (FZEasyFile.class){

if (!instance) {

instance = [[FZEasyFile alloc] init];

}

return instance;

}

- (NSString *)fullFileName:(NSString *)shortFileName {

//search the "document" path

NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentDirectory = [directoryPaths objectAtIndex:0];

NSString *file = [documentDirectory stringByAppendingPathComponent:shortFileName];

return file;

}

- (BOOL)isFileExists:(NSString *)fileName {

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *file = [self fullFileName:fileName];

return [fileManager fileExistsAtPath:file];

}

- (void)createFile:(NSString *)fileName overwrite:(BOOL)shouldOverwrite {

NSFileManager *fileManager = [NSFileManager defaultManager];

//create file directory, include multilayer directory

NSRange lastTag = [fileName rangeOfString:@"/" options:NSBackwardsSearch];

if (lastTag.location != NSNotFound && lastTag.location != 0) {

NSString *shortDir = [fileName substringToIndex:lastTag.location];

NSString *fullDir = [self fullFileName:shortDir];

NSLog(@"full directory: %@", fullDir);

if (![fileManager fileExistsAtPath:fullDir]) {

[fileManager createDirectoryAtPath:fullDir withIntermediateDirectories:YES attributes:nil error:nil];

}

NSString *file = [self fullFileName:fileName];

NSLog(@"full file name:%@", file);

//file not exists or want to overwrite it

if (shouldOverwrite || ![fileManager fileExistsAtPath:file]) {

BOOL suc = [fileManager createFileAtPath:file contents:nil attributes:nil];

NSLog(@"create file(%@) %@", file, suc ? @"successfully" : @"failed");

}

@end

使用方法：

导入头文件：

#import "FZEasyFile.h"

判断地址是否已存在

[EasyFile isFileExists:@"my/file/path/info.txt"]

创建

[EasyFile createFile:"my/file/path/info.txt" overwrite:NO];

写入文件中：拼接和覆盖写入

[FZEasyFile writeFile:"my/file/path/info.txt" contents:[@"a" dataUsingEncoding:NSUTF8StringEncoding] append:NO];

[FZEasyFile writeFile:"my/file/path/info.txt" contents:[@"b" dataUsingEncoding:NSUTF8StringEncoding] append:YES];

After these calling the content of the file is "ab".

删除文件

[FZEasyFile removeFile:"my/file/path/info.txt"];

[FZEasyFile removeFile:"my/file/path"];

获取绝对路径（实际存储路径）

NSString *fullName = [EasyFile fullFileName:"my/file/path/info.txt"];

转换

After getting the full name, you can pass it to other API, such as NSInputStream:

NSInputStream *input = [NSInputStream inputStreamWithFileAtPath:fullName];