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https://github.com/protosphere/PSDirectoryPickerController

Compatibility

• Compatible with iPhone/iPod Touch & iPad.
• Requires iOS 5 or higher.

Sample use

PSDirectoryPickerController *directoryPicker = [[PSDirectoryPickerController alloc] initWithRootDirectory:@"/path/to/some/directory/"];

[directoryPicker setDelegate:self];
[directoryPicker setPrompt:@"Choose a directory"];
[directoryPicker setModalPresentationStyle:UIModalPresentationFormSheet];

[self presentModalViewController:directoryPicker animated:YES];

- (void)directoryPickerControllerDidCancel:(PSDirectoryPickerController *)picker
{
    NSLog(@"Cancelled!");
}

- (void)directoryPickerController:(PSDirectoryPickerController *)picker didFinishPickingDirectoryAtPath:(NSString *)path
{
    NSLog(@"Picked directory at %@", path);
}