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.
// Copyright (c) 2014年 shannonchou. All rights reserved.
//
#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.
// Copyright (c) 2014年 shannonchou. All rights reserved.
//
#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];