ios系统下删除文件的代码

if ([fileManager removeItemAtPath:@"FilePath" error:NULL]) {   NSLog(@"Removed successfully"); }

NSFileManager *defaultManager;defaultManager = [NSFileManager defaultManager];[defaultManager removeFileAtPath: tildeFilenamehandler: nil];

//// 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);  }}@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