Xcode/Objective C: Given a Twitter account name, return a profile picture without logging into Twitter

Xcode/Objective C: Given a Twitter account name, return a profile picture
without logging into Twitter

I'm working with Objective C/Xcode. I don't want a user to log into
Twitter, I just want to get the profile picture of a small amount of
Twitter accounts.
I've been looking around online everywhere and it seems that with Twitters
1.0 deprecation, the 1.1 API has much more complicated ways of getting the
picture.
Could somebody help me figure out a concise way of getting a profile
picture for any given twitter account name?
Thank you!