I am a newbie in iOS. I want to set Launch Image in my app. And I'm using Asset Catalog. And I know I have to drag and drop the image to the boxes that shows up when I'm using Asset Catalog. But a weird thing which is happening at that time is when I'm trying to drag-drop, it just comes back . As if Xcode is telling me NO PLACE HERE. Xcode doesn't let me set my Launch Images. I'm not able to DROP my images in those boxes. And I know the sizes of my images are quite correct. 640*960, 640*1136, 750*1334, 1242*2208.(And I don't want to use LaunchScreen because it only supports iOS 8 and later.)
It's even more weird that people are down voting without even telling the reason. (If you are not good enough to help at least don't discourage newbies)
Got the solution.
Just answering my question so that if anyone is having same problem then here is the solution. My problem was because by mistake I was using images of "jpg" format where in fact I should have used "png" . Now I'm using "png" and it works perfect.