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Pro Learning track
Treehouse offers an iOS Development With Swift track. Tracks are great as they provide guidance, so you know what courses to take and in what order.
Pro Build an iPhone app as you learn
Building an interesting real-world project makes for a fun way to learn how to apply what you've learned.
Con Credit card required to sign up for the free trial
Treehouse offers a free 14-day trial, but requires a credit card to sign up.