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ios系统下删除文件的代码_IOS开发

2015-06-06 16:59:26 [小 大] 已经帮助：人解决问题

 　　本文给大家总结了几则在IOS系统下删除文件的代码，十分的实用，有需要的小伙伴可以参考下。LGfHTML5中文学习网 - HTML5先行者学习网

　　方法一：这段objective c代码用于删除指定路径的文件LGfHTML5中文学习网 - HTML5先行者学习网

　　?LGfHTML5中文学习网 - HTML5先行者学习网

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

　　方法二：LGfHTML5中文学习网 - HTML5先行者学习网

　　?LGfHTML5中文学习网 - HTML5先行者学习网

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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: 。LGfHTML5中文学习网 - HTML5先行者学习网

　　方法三：LGfHTML5中文学习网 - HTML5先行者学习网

　　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LGfHTML5中文学习网 - HTML5先行者学习网

　　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LGfHTML5中文学习网 - HTML5先行者学习网

　　StorageData.mLGfHTML5中文学习网 - HTML5先行者学习网

　　?LGfHTML5中文学习网 - HTML5先行者学习网

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//
// 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LGfHTML5中文学习网 - HTML5先行者学习网

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