iPhone style guidelines

I'm looking for some well known style guidelines for mobile applications.

My application is primarily forms b开发者_开发知识库ased using Xamarin.

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The book "Safari and WebKit Development for iPhone OS 3.0" is a little older but have nice tips about it. Like this one.

I will although encourage you to use some kind of template first like this one.

But I'm sure the best place is the iOS human interface guidelines, directly from the Apple team.