I want to share on gmail using UIActivityViewController without custom activity

Question

I browse many stack overflow links for share on gmail using UIActivityViewController. All are saying make custom UIACtivy , but that option will make new custom activity , I don't want that. The code for gmail share which is given UIActivityViewController not showing body text in gmail is using custom activity. I have check IMDb application, In it sharing using UIActivityViewController is done and its working perfectly fine with gmail without custom activity . Please provide me solution for swift to share on gmail using UIActivityViewController without creating custom activity. If this is not possible without custom activity , can you give me reason for that?Please provide solution for swift only as many time happens code for objective-c doesn't work with swift.