Code to delete files under iOS system

This article summed up a few in the iOS system to delete the file code, very practical, the need for small partners can refer to.

Method One: This section of Objective C code is used to delete the file of the specified path

if ([FileManager removeitematpath:@ "FilePath" Error:null]) {NSLog (@ "removed successfully");}

Method Two:

Nsfilemanager *defaultmanager;   Defaultmanager = [Nsfilemanager Defaultmanager]; [Defaultmanager Removefileatpath:tildefilename Handler:nil];

Handler can receive messages, such as if the deletion fails, you can use Filemanager:shouldproceedaftererror:.

Method Three:

IOS Delete File Delete folder Create file Create folder determine file exists MD5 encapsulation class

I have recently been using data access and deletion, so I wrote a functional class, their own use or quite convenient to share again

storagedata.m

STORAGEDATA.M//XUNYI7////Created by David on 13-6-28. Copyright (c) 2013 David. All rights reserved.   #import <CommonCrypto/CommonDigest.h> #import "StorageData.h" #import "xunYi7AppDelegate.h"   @ Implementation Storagedata  -(void) connection: (Nsurlconnection *) connection didreceivedata: (NSData *) data{ NSLog (@ "Start knot didreceivedata search Data"); }  -(void) connection: (Nsurlconnection *) connection didreceiveresponse: (Nsurlresponse *) response{NSLog (@ " Start knot didreceiveresponse search Data "); }  -(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]];  //Create directory 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] St Ringbyappendingpathcomponent:[self Fetchtodaydate]]; NSString*yesterdaydatafilepath = [[self datapath] stringbyappendingpathcomponent:[self fetchyesterdaydate]];  //Create directory 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) {//Local data return localdata  }else{//remote fetch data   nsmutabledata *receiveddata = [self remo Tefetchdata:dataurl];   if (receiveddata!= nil) {if ([self storagedatatofile:receiveddata filename:currentdatafilepath]) {NSLog (@ Save successful) ); [Self removedirectory]; }else{NSLog (@ save failed);} else{if ((Localdata = [self Fromfilenamepathfetchlocaldata:yesterdaydatafilepath])!= nil) {return localdata;}} return R EceiveddaTa return nil; }  //MD5 Encryption string + (NSString *) MD5: (NSString *) str{const char *CSTR = [str utf8string]; unsigned char result[16]; CC_MD5 (CStr, strlen (CStr), result); This is the MD5 called return [NSString stringWithFormat: @ "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%0 2x%02x ", Result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], re SULT[10], result[11], result[12], result[13], result[14], result[15]; //Upload picture storage + (void) Saveuploadimage: (UIImage *) image withname: (NSString *) imagename{nsfilemanager = [[ Nsfilemanager alloc] init]; Nserror *error;  //Get sandbox directory 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);  //write the picture to the file [ImageData Writetofile:fullpath Atomically:no];  //Upload picture delete + (void) Removeuploadimage: (UIImage *) image withname: (NSString *) imagename{Nsfilemanager *filemanager = [[[Nsfilemanager alloc] init]; Nserror *error;  //Get sandbox directory nsstring *fullpath = [Nshomedirectory () stringbyappendingpathcomponent:@ "Documents"]; FullPath = [FullPath stringbyappendingpathcomponent:@ "Tmpimage"]; if (![ FileManager Fileexistsatpath:fullpath]) {[FileManager Removeitematpath:fullpath error:&error];}}  //Get stored picture + (NSString *) Fetchuploadimagepath: (NSString *) imagename{nsstring *fullpath = [Nshomedirectory () stringbyappendingpathcomponent:@ "Documents"]; FullPath = [FullPath stringbyappendingpathcomponent:@ "Tmpimage"]; FullPath = [FullPath stringbyappendingpathcomponent:imagename]; return fullpath;  //Determine if the file exists + (NSString *) isfileexists: (NSString *) fullpath{Nsfilemanager *FileManager = [[Nsfilemanager alloc] init]; if ([FileManager Fileexistsatpath:fullpath]) {return fullpath;} return nil;  //Data storage//+ (void)  //Get directory of stored files + (NSString *) datapath{//Here first specify the image access path (default write to Application sandbox) Nsarray *paths = Nssearc Hpathfordirectoriesindomains (Nsdocumentdirectory,nsuserdomainmask, YES);  //and file a filename nsstring *filepathderectory = [Paths objectatindex:0];   return filepathderectory;  //Get data for specified file + (Nsmutabledata *) Fromfilenamepathfetchlocaldata: (NSString *) filename{//Save data to specified file Nsfilemanager *filemanager = [[Nsfilemanager alloc] init]; if ([FileManager Fileexistsatpath:filename]) {NSData *data = [FileManager contentsatpath:filename]; return [data Mutablecopy]; }   return nil;  //Storing data to specified file + (BOOL) Storagedatatofile: (NSData *) data fileName: (NSString *) filename{//Save data to specified file Nsfilemanager *filemanager = [[Nsfilemanager alloc] init]; if ([FileManager createfileatpath:filename contents:data Attributes:nil]) {return YES} else{return NO; }  //delete file + (void) DeleteFile: (NSString *) filename{Nsfilemanager *filemanager = [[Nsfilemanager alloc] init]; Nserror *error; [FileManager removeitematpath:filename error:&error];  //Get today's Date + (NSString *) fetchtodaydate{nsdate *currentdate = [NSDate Date]; NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init]; [Dateformatter Setdatestyle:nsdateformattermediumstyle]; return [Dateformatter stringfromdate:currentdate];  //Get yesterday's Date + (NSString *) fetchyesterdaydate{nsdate *yesterdaydate = [NSDate datewithtimeintervalsincenow:-(24 * 6 0 * 60)]; NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init]; [Dateformatter Setdatestyle:nsdateformattermediumstyle]; return [Dateformatter stringfromdate:yesterdaydate];  //Get the day before yesterday + (NSString *) fetchyesterdaybeforedate{nsdate *yesterdaydate = [NSDate datewithtimeintervalsincenow: -(2 * (24 * 60 * 60))]; NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init]; [Dateformatter SETDATESTYLE:NSDAteformattermediumstyle]; return [Dateformatter stringfromdate:yesterdaydate];  //Get data to store files  //Create files  //Create Directory + (NSString *) CreateDirectory: (NSString *) directoryname{Nsfilemanager *f Ilemanager = [[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}} Delete file + (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); }  //delete directory + (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 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

There are imperfections where you want to correct and modify