Bartley is used to the style of football at Arsenal, where he came through the ranks, and has said that the similar style employed by Swansea made the move too good an opportunity to turn down.
"I had my education at Arsenal and I do like to play football and play it out from the back and watching Swansea last year that is exactly what they have done so that is a massive thing for me joining Swansea," he told Swansea's official website.
"I was newly promoted to the Arsenal first team and I spoke to Arsene Wenger briefly last week just wondering what his plans were for the season and he told me game time would be at a minimum to be honest.
"For that reason I wanted to at least go out on loan and that was going to be the plan until Swansea came in and it was just too much of a good opportunity for me to turn down."
Bartley made his debut for Arsenal in December 2009 but did not make a league appearance for the club.