I don’t know how to create a textfield with a camera button like the one in the screenshot.
Is there any open source project that creates a user interface like that?

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I think you are approaching this in the wrong way. This, to me, looks like a UITextView (because it’s multi-line) and a UIToolbar set to animate in with the keyboard when that gets called.
So, in short: UITextView for the tweet, UILabel (with perhaps a button on top) for the location, a toolbar that animates in when the keyboard gets called when the view loads and then, at least initially, a camera button, that morphs into a UIImageView with a clear button slapped on top once you initially select an image.