Hi,
I'm working on iOS, Mac OS X and Android mobile development for more than 4 years. I have a very good experience working with Swift 2 and a good experience with Objective-C. I completed your question with 30 hours per week , still depending on the necessities I can work full time 40 hours per week only one your project.
In the last year, I was worked on social media iOS applications (iPhone) and image processing software for Mac
Currently I'm between projects and willing to start when you are ready.
Kind regards