How to add properties in info.plist in iOS

Question

I want to open PDF attachment via email in my own application: I refer two link here:

How do I associate file types with an iPhone application?

and here on Raywe

Answer 1

may be worth mentioning how to get there..

Info.plist is one of the file below the Main.storyboard or viewController.swift

when you click on it first time it usually is in a table format,so right click the file and 'open as' Source code and then add the code