ios - What is the least resource-intensive way to know whether the object is a folder? -

i need sort 8145 objects (there may more) files , folders. (tested on a8x).

first method.

for(nsstring *filename in fileslist) //this method takes average of 7.7 seconds. {     fileextension = (__bridge cfstringref)[filename pathextension];     fileuti = uttypecreatepreferredidentifierfortag(kuttagclassfilenameextension, fileextension, null);     if ([­[­[­[nsfilemanager defaultmanager] attributesofitematpath:[folderpath stringbyappendingpathcomponent:filename] error:nil] filetype] isequaltostring:@"nsfiletypedirectory"] && !uttypeconformsto(fileuti, kuttypertfd))        [onlyfolderlist addobject:filename];     else        [onlyfileslist addobject:filename]; } 

second method.

for(nsstring *filename in fileslist) //this method takes average of 2.9 seconds. {      fileextension = (__bridge cfstringref)[filename pathextension];      fileuti = uttypecreatepreferredidentifierfortag(kuttagclassfilenameextension, fileextension, null);       [[nsfilemanager defaultmanager] fileexistsatpath:[folderpath stringbyappendingpathcomponent:filename] isdirectory:&isdir];       if (isdir && !uttypeconformsto(fileuti, kuttypertfd))           [onlyfolderlist addobject:filename];       else           [onlyfileslist addobject:filename]; } 

do know faster way?

-----update add fastest method----- // 0.26 seconds 8145 objects!

    nsnumber *isdirectory;     nserror *error = nil;     nsstring *name;     nsarray *fileslist = [[nsfilemanager defaultmanager] contentsofdirectoryaturl:[nsurl fileurlwithpath:folderpath] includingpropertiesforkeys:[nsarray arraywithobjects:nsurlisdirectorykey,nsurlnamekey,nil] options:nsdirectoryenumerationskipshiddenfiles error:nil];     (nsurl *url in fileslist)     {        [url getresourcevalue:&name forkey:nsurlnamekey error:&error];        [url getresourcevalue:&isdirectory forkey:nsurlisdirectorykey error:&error];        if ([isdirectory boolvalue])        {            cfstringref fileextension = (__bridge cfstringref)[name pathextension];            cfstringref fileuti = uttypecreatepreferredidentifierfortag(kuttagclassfilenameextension, fileextension, null);            if (!uttypeconformsto(fileuti, kuttypertfd))                [onlyfolderlist addobject:name];            else                [onlyfileslist addobject:name];        }        else            [onlyfileslist addobject:name];     } 

try using contentsofdirectoryaturl:includingpropertiesforkeys:options:error::

nsurl *root = ... // root url file list nsfilemanager *fm = [nsfilemanager defaultmanager]; nserror *error = nil; nsarray *fileslist = [fm contentsofdirectoryaturl:root includingpropertiesforkeys:@[ nsurlisdirectorykey, nsurltypeidentifierkey ] options:nsdirectoryenumerationskipshiddenfiles error:&error]; if (dirurls) {     (nsurl *fileurl in fileslist) {         nsstring *filename = [[fileurl path] lastpathcomponent];         nsnumber *isdir = nil;         [fileurl getresourcevalue:&isdir forkey:nsurlisdirectorykey error:nil]         if ([isdir boolvalue]) {             nsstring *uti;             [fileurl getresourcevalue:&uti forkey:nsurltypeidentifierkey error:nil];             if ([(__bridge nsstring *)kuttypertfd isequaltostring:uti]) {                 [onlyfileslist addobject:filename];             } else {                 [onlyfolderslist addobject:filename];             }         } else {             [onlyfileslist addobject:filename];         }     } } else {     nslog(@"unable list of files in %@: %@", root, error); }