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: tildeFilenamehandler: 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 callreturn [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:fullPathwithIntermediateDirectories:YESattributes: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:directoryNamewithIntermediateDirectories:YESattributes: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）;}}@endStorageData.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