Following from njuri's response below, I have added a new image asset and placed within it three images: 200 x1, 400 x2, and 600 x3 (please see image below): Launch Screen in Xcode for Swift
Is this correct? I wasn't sure if you meant 200 x1, 400 x2 and 600 x3 or 200 x1, x2, x3; 400 x1, x2, x3; 600 x1, x2, x3 (in other words 3 images or 9 images).
Also, I have the 'Universal' box checked. Is that correct?
Thanks.