ios - delete single files that are downloaded into the documents directory - ios

Question

Firstly = I apologize because I have already tried to ask this once before here
I am really struggling with this:
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
// Delete the row from the data source.
[_mainTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
By using the code above I know it is possible to delete an entry from an array that is displayed in a UITableView. However I am wanting to delete files form my Documents Directory that are downloaded by the user and no longer required.
Now I in the mean time and after more searching this code:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
NSString *file = [[NSString alloc] init];
for(int i=0; i<[paths count]; i++)
{
file = [documentsDirectoryPath stringByAppendingFormat:#"/%#",_fileArray];
NSLog(#"%#", file);
}
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:file error:NULL];
Allows me to list all the files that are in the array in my console and this code:
- (void)removeFile:(NSString*)fileName {
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.mp3", fileName]];
[fileManager removeItemAtPath: fullPath error:NULL];
NSLog(#"image removed");
}
together with: [self removeFile: _filename]; allows me to delete a specific file.
so I am making head way. But I am really stuck when it comes to a user being able to swipe and delete a file. Of Course I do not know what file is going to be in the directory.
Secondly - How do I handle being able to load the tableView once all the files are deleted?
If I do that using this code:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([paths count] > 0)
{
NSLog(#"Path: %#", [paths objectAtIndex:0]);
NSError *error = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
// Remove Documents directory and all the files
BOOL deleted = [fileManager removeItemAtPath:[paths objectAtIndex:0] error:&error];
}
I get the an termination error - I think that is because the directory has also been removed.
I know there is a bit of code here, but I really hope someone and guide me through this:-)

Answer 1

If i correctly understood, you want step by step guide.
Lets consider that you have a working UITableView (mainTableView) that take data from NSMutableArray (mainArray).
This will return document directory path.
-(NSString*)filePath{
NSString *path=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSLog(#"%#",path);
return path;
}
Somewhere we need to init array ,i did it on viewDidLoad.
- (void)viewDidLoad
{
[super viewDidLoad];
mainDataArray=[[NSMutableArray alloc]init];
[self loadContentsOfDirectory:[self filePath]];
}
//here i am adding names of files from documents directory
-(void)loadContentsOfDirectory:(NSString*)path
{
NSError *error=nil;
NSArray *pathArray=[[NSFileManager defaultManager]contentsOfDirectoryAtPath:path error:&error];
if (error) {
NSLog(#"ERROR: %#",error);
}else{
if (pathArray) {
[mainDataArray removeAllObjects];
[mainDataArray addObjectsFromArray:pathArray];
}
}
}
#pragma mark UITableView_Methods
//delete file then if file is deleted , remove filename from array and remove cell
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
NSString *fileName=[mainDataArray objectAtIndex:indexPath.row];
NSError *error=nil;
NSString *pathToDelete=[[self filePath]stringByAppendingPathComponent:fileName];
BOOL succes=[[NSFileManager defaultManager]removeItemAtPath:pathToDelete error:&error];
if (error) {
NSLog(#"ERROR: %#",error);
}
// if file is succes deleted
if (succes) {
//remove this item from array
[mainDataArray removeObject:fileName];
//and remove cell
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationLeft];
}else{
UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:#"Alert!" message:#"File can not be deleted" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alertView show];
}
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [mainDataArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *reusableCell=#"cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:reusableCell];
if (cell==nil) {
cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reusableCell];
}
cell.textLabel.text=[mainDataArray objectAtIndex:indexPath.row];
return cell;
}
I think your error is that you do not remove something maybe cell, object in array.
Hope this will help.

Answer 2

If you want to delete selected files from your Documents directory then.
First you have to get all files from Documents directory of your app like this
-(NSArray *)listFileAtPath:(NSString *)path
{
NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];
return directoryContent;
}
Then use return array from above function to display files to UITableView
NSArray *filesArray = [self listFileAtPath:documentDirectoryPath];
And finally when you delete selected files then you have to remove that file from Documents directory and also from filesArray for managing UITableView something like this:
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
// Delete the row from the data source.
[_mainTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
// Remove file from document directory
NSError *error = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL deleted = [fileManager removeItemAtPath:[paths objectAtIndex:0] error:&error];
// Remove file entry from filesArray
[filesArray removeObjectAtIndex:indexPath.row];
}
}
Hope will help you if you want to do something like this.