Question

How can I copy/move a movie from Camera Roll to an app’s own Documents folder?

Answer 1

You can implement your delegate method imagePickerController:didFinishPickingMediaWithInfo: like this –

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSURL * fileURL = [info objectForKey:UIImagePickerControllerMediaURL];

    NSString * documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString * storePath = [documentsDirectory stringByAppendingPathComponent:@"myMovie.MOV"];

    NSError * error = nil;
    [[NSFileManager defaultManager] copyItemAtURL:fileURL
                                            toURL:[NSURL fileURLWithPath:storePath]
                                            error:&error];

    if ( error ) 
        NSLog(@"%@", error);

    [self dismissModalViewControllerAnimated:YES];
}

Once the user selects a movie, you get a file URL to a temporary file using the key UIImagePickerControllerMediaURL in the info dictionary passed as argument to the delegate method. You can get that and then copy the file to the documents directory using NSFileManager.