ios系统下删除文件的代码

所属分类：软件编程 / IOS 阅读数： 506

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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

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