D.J.
My son was the same way, he would sleep fine in the crib at night, but only wanted to nap in the swing. We also "picked our battles." We just let him sleep in the swing until he got close to the weight limit (around 25 pounds), which was probably around 12-14 months. After that, he went to the crib pretty well. I also remember letting him nap with me in the rocking chair for a while, that seemed to be a good transition.