macbook enough for iphone app development ?

I decided to try selling few shitty apps after having seen what crap people acutally buy, tho it seems I need a macbook to make those

I don't want to buy an iphone on top of it so is the emulator thingy enough for development ?

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google maps navigation and robo defense are not available for any platform other than android.

Navigation and tower defense games are available for all platforms.