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:urlcachePolicy:NSURLRequestUseProtocolCachePolicy   timeoutInterval:60];NSURLResponse *response = [[NSURLResponse alloc] init];NSError *receiveDataError = [[NSError alloc] init];NSMutableData *receivedData = (NSMutableData *)[NSURLConnection sendSynchronousRequest:requestreturningResponse:&responseerror:&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:fullPathwithIntermediateDirectories: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:directoryNamewithIntermediateDirectories: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);  }}@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 : NSObjectNSURLConnectionDataDelegate, 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