sample.m

- (void)mouseDown:(NSEvent *)theEvent
{
    DLog(@"");

    
    // Write data to the pasteboard
    NSArray *fileList = @[[NSString stringWithFormat:@"%@://%@", self.url.scheme, self.url.path]];
    NSPasteboard *pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
    [pboard declareTypes:[NSArray arrayWithObject:NSTIFFPboardType]
                   owner:nil];
    [pboard setPropertyList:fileList
                    forType:NSFilenamesPboardType];
    

    NSDraggingItem *item = [[NSDraggingItem alloc] initWithPasteboardWriter:self];
    
    [item setImageComponentsProvider:^NSArray *{
        NSDraggingImageComponent *imageComponent = [[NSDraggingImageComponent alloc] initWithKey:NSDraggingImageComponentIconKey];
        imageComponent.contents = self.memeImageView.image;
        return @[imageComponent];
        
    }];
    
    
    [self beginDraggingSessionWithItems:@[item]
                                  event:theEvent
                                 source:self];

}