how to find subfolder in an existing folder in iOS - ios

Question

My folder contains only one sub-folder, and I don't know sub-folder's name. This sub-folder contains a html file, and once again I don't know the html file's name.
My question is how I can get full path of this file by using
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *folderPath = [documentsDirectory stringByAppendingPathComponent:filename];
//- access sub-folder?
//- access html file?
EDITED:
I wrote a method to return the only one sub-folder as follow:
+ (NSString*) get1stSubFolder:(NSString*)folder
{
NSDirectoryEnumerator *directoryEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:folder];
//- no recursive
[directoryEnumerator skipDescendents];
NSString* file;
while (file = [directoryEnumerator nextObject])
{
BOOL isDirectory = NO;
BOOL subFileExists = [[NSFileManager defaultManager] fileExistsAtPath:file isDirectory:&isDirectory];
if (subFileExists && !isDirectory) {
return file;
}
}
return nil;
}
I always get nil as result. Do you know where was I wrong at?

Answer 1

Use NSDirectoryEnumerator. It should help you.

Answer 2

Use NSDirectoryEnumerator like this.
NSURL *documentsDirectoryURL = [NSURL URLWithString:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] ];
///If the folder you want to browse for subfolders is NSDocumentDirectory.
NSArray *keys = [NSArray arrayWithObject:NSURLIsDirectoryKey];
NSDirectoryEnumerator *enumerator = [[[NSFileManager alloc] init]
enumeratorAtURL:documentsDirectoryURL
includingPropertiesForKeys:keys
options:0
errorHandler:^(NSURL *url, NSError *error) {
return YES;
}];
for (NSURL *url in enumerator) {
NSError *error;
NSNumber *isDirectory = nil;
if (! [url getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:&error]) {
NSLog(#"Error %#",error);
}
else if ([isDirectory boolValue]) {
NSLog(#"Folder URL: %#",url);
}else{
NSLog(#"File URL: %#",url);
}
}