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Doesn’t iOS development to day require a $99/year subscription? And if you’re not working in something like UE4’s blueprints, a machine running OS X as well? That’s a much higher barrier to entry for most people.
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Actually, no. The $99/year is only required to run on the device, or put it on the app store but you can download Xcode and run in the simulator for free. I wrote the book based on the simulator. I had a chapter at the end about running on the device, but Apple asked me to remove it before publication.