LBS development platform based on IOS

As the title suggests, I want to develop some of the LBS application, seeking some information extremely grateful
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lbs hell
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Looks like there API available
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This helps Apple's official documentation and sample programs provided are very good
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The official comes MKMapView you can have a look. Also google map also has controls and webservice interface designed for iphone form provided. baidu map also through UIWebview to display. . .
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Just bought one, looking forward. . .
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Foursquare look at the source code for it
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Brothers, where source code download ah?

reference to the 6th floor rockcody reply:

foursquare look at the source code of it