I guess you can learn both ways. But if tou want to save some time, learn to read. Having studied violin (and piano) at the conservatory for 10 years, I can assure you that knowing how to read is a must. With time, you'll pick up new pieces very fast, and once you're familiar with the text, you'll be able to concentrate on making music and forget the partition. You must not forget that playing a musical instrument involves technical skills that take up a great part of your concentration. You can't do everything at the same time: try to place your fingers at the right place, keep the dynamics right and ask yourself if you're playing the right notes. Knowing how to read will give you the advantage of beeing able to learn a piece a lot faster. It also gives you a visual reference witch to my opinion is a lot easier to memorize than sounds in relation to one another. Try to find a teacher who is willing to give you some ear training. You won't regret it.
Good luck
Good luck