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copied!<p><strong>Sample Code :</strong></p> <pre><code>NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSArray *directory = [[NSFileManager defaultManager] directoryContentsAtPath: documentsDirectory]; BOOL isDirectory; for (NSString *item in directory){ BOOL fileExistsAtPath = [[NSFileManager defaultManager] fileExistsAtPath:item isDirectory:&isDirectory]; if (fileExistsAtPath) { if (isDirectory) { //It's a Directory. } } if ([[item pathExtension] isEqualToString:@"png"]) { //This is Image File with .png Extension } } </code></pre> <hr> <p>You can also use <a href="http://developer.apple.com/library/mac/#documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html" rel="noreferrer"><strong>Uniform Type Identifiers</strong></a> as explained by <strong>Bavarious</strong> <a href="https://stackoverflow.com/a/5815629/1603072">here</a>. </p> <p><strong>Sample Code :</strong></p> <pre><code>NSString *file = @"…"; // path to some file CFStringRef fileExtension = (CFStringRef) [file pathExtension]; CFStringRef fileUTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, fileExtension, NULL); if (UTTypeConformsTo(fileUTI, kUTTypeImage)) NSLog(@"It's an image"); else if (UTTypeConformsTo(fileUTI, kUTTypeMovie)) NSLog(@"It's a movie"); else if (UTTypeConformsTo(fileUTI, kUTTypeText)) NSLog(@"It's text"); CFRelease(fileUTI); </code></pre>

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