How is a Iphone app made? And what programming language should I learn?

I'm starting to learn java, but I want to make Iphone apps. What programming language do they use, and can you link me to any videos or books where they talk about the making of one and how they got it on the market.

Added (1). Also do you need a macbook to make apps?

Xcode, yes you need a mac (any mac will work)

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