How to get only the filename of a NSUrl array - ios

Question

I have an array of NSUrl but I only need the filename of each path to show up in a tableview text label cell.
I'm getting the files from documents directory and filtered the .csv files that are the ones I need to show up in the table view's cell.
Here is my code:
NSError *err;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *documentDirectoryURL = [fileManager URLForDirectory:NSDocumentDirectory
inDomain:NSUserDomainMask
appropriateForURL:nil
create:false
error:&err];
NSMutableArray *files = [[fileManager contentsOfDirectoryAtURL:documentDirectoryURL
includingPropertiesForKeys:#[NSURLCreationDateKey ]
options:0
error:&err] mutableCopy];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"pathExtension='.csv'"];
NSArray *csvFiltered = [files filteredArrayUsingPredicate:predicate];
////////////
NSMutableArray*allItems = [NSMutableArray new];
for (NSURL*paramURL in csvFiltered)
{
NSString *basenameOnly = documentDirectoryURL.lastPathComponent.stringByDeletingPathExtension;
[allItems addObject:basenameOnly];
}
NSLog(#"%#", allItems);
self.dirList = [allItems mutableCopy];
self.data.reloadData;
}
BOOL ascending = YES;
[files sortUsingComparator:^(NSURL *lURL, NSURL *rURL) {
NSDate *lDate, *rDate;
[lURL getResourceValue:&lDate forKey:NSURLCreationDateKey error:nil];
[rURL getResourceValue:&rDate forKey:NSURLCreationDateKey error:nil];
return ascending ? [lDate compare:rDate] : [rDate compare:lDate];
}];

Answer 1

First of all I have a déjà vu
Second of all do not get only the filename of a NSUrl array. You will lose the ability to sort the files by creation date.
You cannot filter an array of NSURL with a predicate, you must filter the files in a loop.
To use the filtered array as a data source first create a property in the .h file
#property NSMutableArray<NSURL *> *files;
In the .m file create a separate method to sort the files
- (void)sortFilesByCreationDateAscending:(BOOL)ascending
{
[self.files sortUsingComparator:^(NSURL *lURL, NSURL *rURL) {
NSDate *lDate, *rDate;
[lURL getResourceValue:&lDate forKey:NSURLCreationDateKey error:nil];
[rURL getResourceValue:&rDate forKey:NSURLCreationDateKey error:nil];
return ascending ? [lDate compare:rDate] : [rDate compare:lDate];
}];
}
Get the files, filter them and sort them in viewDidLoad. Then reload the table view
- (void)viewDidLoad {
[super viewDidLoad]:
self.files = [[NSMutableArray alloc] init];
NSError *error;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *documentDirectoryURL = [fileManager URLForDirectory:NSDocumentDirectory
inDomain:NSUserDomainMask
appropriateForURL:nil
create:false
error:nil];
NSArray<NSURL *> *fileURLs = [fileManager contentsOfDirectoryAtURL:documentDirectoryURL
includingPropertiesForKeys:#[NSURLCreationDateKey]
options:0
error:&error];
if (error) {
NSLog(#"%#", error);
return;
}
for (NSURL *anURL in fileURLs) {
if ([anURL.pathExtension isEqualToString:#"csv"]) {
[self.files addObject: anURL];
}
}
[self sortFilesByCreationDateAscending:YES];
[self.tableView reloadData];
}
In numberOfRowsInSection return self.files.count
In cellForRowAtIndexPath get the URL for the index path and display the file name
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *simpleTableIdentifier = #"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier forIndexPath: indexPath];
NSURL *url = self.files[indexPath.row];
cell.textLabel.text = url.lastPathComponent;
return cell;
}
To sort the files in the other direction call sortFilesByCreationDateAscending with appropriate BOOL value and reload the table view.

Answer 2

You can use this to exclude .csv [ 4 characters ] for every item in the array
NSMutableArray*allItems = [NSMutableArray new];
for ( NSURL* paramURL in csvFiltered )
{
NSString*fullfileWithExten = [paramURL lastPathComponent];
NSString*filename = [fullfileWithExten substringToIndex:[fullfileWithExten length]- 4];
[allItems addObject:filename];
}

Answer 3

Both NSURL and NSString have properties which return back parts of a file path. So given a file URL:
NSURL *itemURL = ...
the last component of the path without the extension is simply given by:
NSString *basenameOnly = itemURL.lastPathComponent.stringByDeletingPathExtension;
where NSURL's lastPathComponent strips off any directories leaving just the final file component, and NSString's stringByDeletingPathExtension then strips of the extension.
HTH

Answer 4

Try below code
NSMutableArray *fileNamesArray = [[NSMutableArray alloc] init];
[fileNamesArray addObject:#"www.abc.com/path/movie1.mp4"];
[fileNamesArray addObject:#"www.abc.com/path/movie2.qt"];
[fileNamesArray addObject:#"www.abc.com/path/movie3.mov"];
[fileNamesArray addObject:#"www.abc.com/path/movie4.movv"];
NSLog(#"fileNamesArray===%#", fileNamesArray);
NSMutableArray *finalFileNamesArray = [[NSMutableArray alloc] init];
NSString *fileNameWithExtension;
NSString *fileNameWithWithoutExtension;
for (int i=0;i<fileNamesArray.count;i++) {
fileNameWithExtension = [self fetchFileNameWithExtension:[fileNamesArray objectAtIndex:i]];
fileNameWithWithoutExtension = [self fetchFileNameWithoutExtension:fileNameWithExtension];
[finalFileNamesArray addObject:fileNameWithWithoutExtension];
}
NSLog(#"finalFileNamesArray===%#", finalFileNamesArray);
Then add below outside viewDidLoad
-(NSString *) fetchFileNameWithExtension:(NSString *) fullPath {
NSArray *parts = [fullPath componentsSeparatedByString:#"/"];
return [parts lastObject];
}
-(NSString *) fetchFileNameWithoutExtension:(NSString *) fullPath {
NSArray *parts = [fullPath componentsSeparatedByString:#"."];
return [parts firstObject];
}
Output is as below
2018-01-20 12:08:25.459 Temp[3622:103513] fileNamesArray===(
"www.abc.com/path/movie1.mp4",
"www.abc.com/path/movie2.qt",
"www.abc.com/path/movie3.mov",
"www.abc.com/path/movie4.movv"
)
2018-01-20 12:08:25.459 Temp[3622:103513] finalFileNamesArray===(
movie1,
movie2,
movie3,
movie4
)
Note: I could have mixed fetchFileNameWithoutExtension inside fetchFileNameWithExtension, but I separate for more clear info.