If I was a high school Junior or Senior now and I knew that i wanted to be an iOS developer, I wouldn;t darken the doors of a college campus. There is plenty of material online for teaching yourself software development in general and more specific mobile developement. You've got tons of forums, tutorials, books, the free stanford IOS class for FREE on iTunes, etc etc. Also companies where mobile development is paramount, they aren't on the "only people with degrees need apply" attitude.