Method 1: This objective c code is used to delete files with specified paths
if ([fileManager removeItemAtPath:@"FilePath" error:NULL]) {
NSLog(@"Removed successfully");
}
Method 2:
NSFileManager *defaultManager; defaultManager = [NSFileManager defaultManager]; [defaultManager removeFileAtPath: tildeFilename handler: nil];
The handler can receive messages. For example, if the deletion fails, you can use fileManager: shouldProceedAfterError: .
Method 3:
IOS Delete Files Delete Folders Create Files Create Folders Determine the file exists md5 Encapsulation Class
I have been using data access and deletion recently, so I wrote a class that includes functions. It is quite convenient to use it myself. I will share it again.
//
//
// xunYi7
//
// Created by david on 13-6-28.
// Copyright (c) 2013 david. All rights reserved.//
#import <CommonCrypto/>
#import ""
#import ""
@implementation StorageData
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
NSLog(@"Start didReceiveData search data");
}
-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
NSLog(@"Start didReceiveResponse to search data");
}
-(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]];
//Create a directory 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]];
//Create a directory 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){//Local data return localData;
}else{//Remote data acquisition
NSMutableData *receivedData = [self remoteFetchData:dataUrl];
if(receivedData != nil){
if([self storageDataToFile:receivedData fileName:currentDataFilePath]){
NSLog(@"Save successfully");
[self removeDirectory];
}else{
NSLog(@"Save failed");
}
}else{
if((localData = [self fromFilenamePathFetchLocalData:yesterdayDataFilePath]) != nil){
return localData;
}
}
return receivedData;
}
return nil;
}
//md5 encrypted string+(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]
];
}
//Upload image storage+(void) saveUploadImage:(UIImage *)image withName:(NSString *)imageName{
NSFileManager *fileManager = [[NSFileManager alloc] init];
NSError *error;
// Get the sandbox directory 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);
// Write pictures to file [imageData writeToFile:fullPath atomically:NO];
}
//Upload image to delete+(void) removeUploadImage:(UIImage *)image withName:(NSString *)imageName{
NSFileManager *fileManager = [[NSFileManager alloc] init];
NSError *error;
// Get the sandbox directory NSString *fullPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
fullPath = [fullPath stringByAppendingPathComponent:@"tmpImage"];
if(![fileManager fileExistsAtPath:fullPath]){
[fileManager removeItemAtPath:fullPath error:&error];
}
}
//Get stored pictures+(NSString *)fetchUploadImagePath:(NSString *)imageName{
NSString *fullPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
fullPath = [fullPath stringByAppendingPathComponent:@"tmpImage"];
fullPath = [fullPath stringByAppendingPathComponent:imageName];
return fullPath;
}
//Judge whether the file exists+(NSString *)isFileExists:(NSString *)fullpath{
NSFileManager *fileManager = [[NSFileManager alloc] init];
if([fileManager fileExistsAtPath:fullpath]){
return fullpath;
}
return nil;
}
//Data storage//+(void)
//Get the directory where the file is stored+(NSString *)dataPath{
//The image access path is first specified here (by default, written to the application sandbox) NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
//Give the file a file name NSString *filePathDerectory = [paths objectAtIndex:0];
return filePathDerectory;
}
//Get the data of the specified file+(NSMutableData *)fromFilenamePathFetchLocalData:(NSString *)filename{
//Save data to the specified file NSFileManager *fileManager = [[NSFileManager alloc] init];
if([fileManager fileExistsAtPath:filename]){
NSData *data = [fileManager contentsAtPath:filename];
return [data mutableCopy];
}
return nil;
}
//Storage data to the specified file+(BOOL) storageDataToFile:(NSData *)data fileName:(NSString *)fileName{
//Save data to the specified file NSFileManager *fileManager = [[NSFileManager alloc] init];
if([fileManager createFileAtPath:fileName contents:data attributes:nil]){
return YES;
}else{
return NO;
}
}
//Delete the file+(void) deleteFile:(NSString *)fileName{
NSFileManager *fileManager = [[NSFileManager alloc] init];
NSError *error;
[fileManager removeItemAtPath:fileName error:&error];
}
//Get today's date+(NSString *) fetchTodayDate{
NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
return [dateFormatter stringFromDate:currentDate];
}
//Get yesterday's date+(NSString *) fetchYesterdayDate{
NSDate *yesterdayDate = [NSDate dateWithTimeIntervalSinceNow:-(24 * 60 * 60)];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
return [dateFormatter stringFromDate:yesterdayDate];
}
//Get the date of the day before yesterday+(NSString *) fetchYesterdayBeforeDate{
NSDate *yesterdayDate = [NSDate dateWithTimeIntervalSinceNow:-(2 * (24 * 60 * 60))];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
return [dateFormatter stringFromDate:yesterdayDate];
}
//Get the data of the stored file
//Create a file
//Create a directory+(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;
}
}
//Delete the file+(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);
}
}
//Delete the directory+(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
//
//
// xunYi7
//
// Created by david on 13-6-28.
// Copyright (c) 2013 david. All rights reserved.//
#import <Foundation/>
@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
There are some imperfections, I hope to correct and modify