Not exactly into iOS dev but based on my experience, it might be worth checking out the following:

1. Freelancer.com 2. PeoplePerHour.com 3. Guru.com 4. Upwork.com

All looked upon as 'fish markets' and 'sweat shops' by many which is not entirely inaccurate, but you will frequently find decently paying jobs too. You might have to struggle initially (with bottom-of-the-barrel jobs) in order to build up your profile and get some reviews, but once you have a few under your belt, things should start getting better. YMMV