ios系统下删除文件的代码

方法一：这段objective c代码用于删除指定路径的文件

if ([filemanager removeitematpath:@"filepath" error:null]) {
   nslog(@"removed successfully");
 }

方法二：

nsfilemanager *defaultmanager;
defaultmanager = [nsfilemanager defaultmanager];

[defaultmanager removefileatpath: tildefilename
handler: nil];

handler可以接收消息，比如如果删除失败，可以使用filemanager:shouldproceedaftererror: 。

方法三：

ios 删除文件 删除文件夹 创建文件 创建文件夹 判断文件存在 md5 封装类

自己最近在使用关于数据的存取和删除，于是自己就写了一个包括功能的类，自己用着还是蛮方便，再次分享一下

storagedata.m

//
// storagedata.m
// xunyi7
//
// created by david on 13-6-28.
// copyright (c) 2013年 david. all rights reserved.
//

#import <commoncrypto/commondigest.h>
#import "storagedata.h"
#import "xunyi7appdelegate.h"

@implementation storagedata

-(void) connection:(nsurlconnection *)connection didreceivedata:(nsdata *)data{
  nslog(@"开始结didreceivedata搜数据");
}

-(void) connection:(nsurlconnection *)connection didreceiveresponse:(nsurlresponse *)response{
  nslog(@"开始结didreceiveresponse搜数据");
}

-(void) connection:(nsurlconnection *)connection didfailwitherror:(nserror *)error{
  nslog(@"didfailwitherror");
}

-(void) connectiondidfinishloading:(nsurlconnection *)connection{
  nslog(@"connectiondidfinishloading");
}

+(nsmutabledata *)remotefetchdata:(nsstring *)dataurl{
  nsstring *currentdatafilepath = [[self datapath] stringbyappendingpathcomponent:[self fetchtodaydate]];
  
  //创建目录
  currentdatafilepath = [self createdirectory:currentdatafilepath];
  
  currentdatafilepath = [currentdatafilepath stringbyappendingpathcomponent:[nsstring stringwithformat:@"%@.plist",[self md5:dataurl]]];
  
  if([xunyi7appdelegate isreachable]){
    nsurl *url = [[nsurl alloc] initwithstring:dataurl];
    nsurlrequest *request = [[nsurlrequest alloc] initwithurl:url
                           cachepolicy:nsurlrequestuseprotocolcachepolicy
                         timeoutinterval:60];
    
    nsurlresponse *response = [[nsurlresponse alloc] init];
    nserror *receivedataerror = [[nserror alloc] init];
    
    nsmutabledata *receiveddata = (nsmutabledata *)[nsurlconnection sendsynchronousrequest:request
                                       returningresponse:&response
                                             error:&receivedataerror];
    [uiapplication sharedapplication].networkactivityindicatorvisible = no;
    
    return receiveddata;
  }else{
    [xunyi7appdelegate shownetworkmessage];
  }

  return nil;
}

+(nsmutabledata *)localfetchdata:(nsstring *)dataurl{
  
  nsstring *currentdatafilepath = [[self datapath] stringbyappendingpathcomponent:[self fetchtodaydate]];
  nsstring *yesterdaydatafilepath = [[self datapath] stringbyappendingpathcomponent:[self fetchyesterdaydate]];
  
  //创建目录
  currentdatafilepath = [self createdirectory:currentdatafilepath];
  
  currentdatafilepath = [currentdatafilepath stringbyappendingpathcomponent:[nsstring stringwithformat:@"%@.plist",[self md5:dataurl]]];
  yesterdaydatafilepath = [yesterdaydatafilepath stringbyappendingpathcomponent:[nsstring stringwithformat:@"%@.plist",[self md5:dataurl]]];
  
  nsmutabledata *localdata = [self fromfilenamepathfetchlocaldata:currentdatafilepath];
  
  if(localdata != nil){//本地数据
    return localdata;
    
  }else{//远程获取数据
    
    nsmutabledata *receiveddata = [self remotefetchdata:dataurl];
    
    if(receiveddata != nil){
      if([self storagedatatofile:receiveddata filename:currentdatafilepath]){
        nslog(@"保存成功");
        [self removedirectory];
      }else{
        nslog(@"保存失败");
      }
    }else{
      if((localdata = [self fromfilenamepathfetchlocaldata:yesterdaydatafilepath]) != nil){
        return localdata;
      }
    }
    return receiveddata;
  }
  return nil;
}

//md5加密字符串
+(nsstring *)md5:(nsstring *)str{
  const char *cstr = [str utf8string];
  unsigned char result[16];
  cc_md5(cstr, strlen(cstr), result); // this is the md5 call
  return [nsstring stringwithformat:
      @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
      result[0], result[1], result[2], result[3],
      result[4], result[5], result[6], result[7],
      result[8], result[9], result[10], result[11],
      result[12], result[13], result[14], result[15]
      ]; 
}
//上传图片存储
+(void) saveuploadimage:(uiimage *)image withname:(nsstring *)imagename{
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  nserror *error;
  
  // 获取沙盒目录
  nsstring *fullpath = [nshomedirectory() stringbyappendingpathcomponent:@"documents"];
  fullpath = [fullpath stringbyappendingpathcomponent:@"tmpimage"];
  if(![filemanager fileexistsatpath:fullpath]){
    [filemanager createdirectoryatpath:fullpath
        withintermediatedirectories:yes
                attributes:nil
                   error:&error];
  }
  
  fullpath = [fullpath stringbyappendingpathcomponent:imagename];
  nsdata *imagedata = uiimagejpegrepresentation(image, 0.5);
  
  // 将图片写入文件
  [imagedata writetofile:fullpath atomically:no];
}

//上传图片删除
+(void) removeuploadimage:(uiimage *)image withname:(nsstring *)imagename{
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  nserror *error;
  
  // 获取沙盒目录
  nsstring *fullpath = [nshomedirectory() stringbyappendingpathcomponent:@"documents"];
  fullpath = [fullpath stringbyappendingpathcomponent:@"tmpimage"];
  if(![filemanager fileexistsatpath:fullpath]){
    [filemanager removeitematpath:fullpath error:&error];
  }
}

//获取存储的图片
+(nsstring *)fetchuploadimagepath:(nsstring *)imagename{
  nsstring *fullpath = [nshomedirectory() stringbyappendingpathcomponent:@"documents"];
  fullpath = [fullpath stringbyappendingpathcomponent:@"tmpimage"];
  fullpath = [fullpath stringbyappendingpathcomponent:imagename];
  return fullpath;
}

//判断文件是否存在
+(nsstring *)isfileexists:(nsstring *)fullpath{
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  if([filemanager fileexistsatpath:fullpath]){
    return fullpath;
  }
  return nil;
}

//数据存储
//+(void)

//获取存储文件的目录
+(nsstring *)datapath{
  //此处首先指定了图片存取路径（默认写到应用程序沙盒 中）
  nsarray *paths = nssearchpathfordirectoriesindomains(nsdocumentdirectory,nsuserdomainmask, yes);
  
  //并给文件起个文件名
  nsstring *filepathderectory = [paths objectatindex:0];
  
  return filepathderectory;
}

//获取指定文件的数据
+(nsmutabledata *)fromfilenamepathfetchlocaldata:(nsstring *)filename{
  //保存数据到指定文件中
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  if([filemanager fileexistsatpath:filename]){
    nsdata *data = [filemanager contentsatpath:filename];
    return [data mutablecopy];
  }
  
  return nil;
}

//存储数据到指定文件
+(bool) storagedatatofile:(nsdata *)data filename:(nsstring *)filename{
  //保存数据到指定文件中
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  if([filemanager createfileatpath:filename contents:data attributes:nil]){
    return yes;
  }else{
    return no;
  }
}

//删除文件
+(void) deletefile:(nsstring *)filename{
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  nserror *error;
  [filemanager removeitematpath:filename error:&error];
}

//获取今天的日期
+(nsstring *) fetchtodaydate{
  nsdate *currentdate = [nsdate date];
  nsdateformatter *dateformatter = [[nsdateformatter alloc] init];
  [dateformatter setdatestyle:nsdateformattermediumstyle];
  return [dateformatter stringfromdate:currentdate];
}

//获取昨天的日期
+(nsstring *) fetchyesterdaydate{
  nsdate *yesterdaydate = [nsdate datewithtimeintervalsincenow:-(24 * 60 * 60)];
  nsdateformatter *dateformatter = [[nsdateformatter alloc] init];
  [dateformatter setdatestyle:nsdateformattermediumstyle];
  return [dateformatter stringfromdate:yesterdaydate];
}

//获取前天的日期
+(nsstring *) fetchyesterdaybeforedate{
  nsdate *yesterdaydate = [nsdate datewithtimeintervalsincenow:-(2 * (24 * 60 * 60))];
  nsdateformatter *dateformatter = [[nsdateformatter alloc] init];
  [dateformatter setdatestyle:nsdateformattermediumstyle];
  return [dateformatter stringfromdate:yesterdaydate];
}

//获取存储文件的数据

//创建文件

//创建目录
+(nsstring *) createdirectory:(nsstring *)directoryname{
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  nserror *error;
  if(![filemanager fileexistsatpath:directoryname]){
    [filemanager createdirectoryatpath:directoryname
        withintermediatedirectories:yes
                attributes:nil
                   error:&error];
    if(error == nil){
      return directoryname;
    }else{
      return directoryname;
    }
  }else{
    return directoryname;
  }
}
//删除文件
+(void) removefile:(nsstring *)filepath{
  nserror *error;
  
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  if([filemanager fileexistsatpath:filepath]){
    [filemanager removeitematpath:filepath error:&error];
  }
  if(error){
    nslog(@"error = %@",error);
  }
}

//删除目录
+(void) removedirectory{
  nsarray *paths = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);
  nsstring *documentspath = [paths objectatindex:0];
  nsstring *removedirectorypath = [documentspath stringbyappendingpathcomponent:[self fetchyesterdaybeforedate]];
  nserror *error;
  
  nsfilemanager *filemanager = [[nsfilemanager alloc] init];
  if([filemanager fileexistsatpath:removedirectorypath]){
    [filemanager removeitematpath:removedirectorypath error:&error];
  }
  if(error){
    nslog(@"error = %@",error);
  }
}
@end
storagedata.h

//
// storagedata.h
// xunyi7
//
// created by david on 13-6-28.
// copyright (c) 2013年 david. all rights reserved.
//

#import <foundation/foundation.h>

@interface storagedata : nsobject<nsurlconnectiondatadelegate, nsurlconnectiondelegate>

+(nsmutabledata *)remotefetchdata:(nsstring *)dataurl;
+(nsmutabledata *)localfetchdata:(nsstring *)dataurl;
+(void) saveuploadimage:(uiimage *)image withname:(nsstring *)imagename;
+(nsstring *) uploadimage:(uiimage *)image withname:(nsstring *)imagename;
+(nsstring *) fetchuploadimagepath;
+(nsstring *) fetchuploadimagepath:(nsstring *)imagename;
+(void) removeuploadimage:(uiimage *)image withname:(nsstring *)imagename;
+(nsstring *)isfileexists:(nsstring *)fullpath;
+(void) removefile:(nsstring *)filepath;
@end

有不完善的地方，希望指正和修改