The reason you stumbled upon this post is because you tried using the .getContentAsPdf() method in a trigger and you got an error message stating you cannot use it in a trigger. So you tried to search and figure out as to how you could do it.
I had faced a similar issue when a task was given to me attach a pdf(which would be automatically created) when a record is created. Inititally I thought its quite simple and accepted it. But when I actually started coding, I became aware of the issues with this requirement.
Well, I googled for a while and came across a post (unfortunately, I could not find it now) which had the solution to this problem, but the guy had not posted the code to demonstrate. So I thought I could share the code in a post as this could help someone.
Here you go:
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