There is an images.xcassets in my project, it contains an icons folder and two subfolders (firstFolder, secondFolder) wit
Click on each folder in the assets catalog and select Provides Namespace in the Utilities View:
You will see that the folder then becomes blue and you can see the path to the image above the images.
You can then access the image like this:
imageView.image = UIImage(named: "folder1/Image")
or in Objective-C:
imageView.image = [UIImage imageNamed:@"folder1/Image"];