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They both specify a map center and how big the box is.
So why use both?
Some function in MKMapview use one and some use the other
(MKCoordinateRegion)regionThatFits:(MKCoordinateRegion)region(MKMapRect)mapRectThatFits:(MKMapRect)mapRect
edgePadding:(UIEdgeInsets)insetsWhat’s their difference?
More importantly, which one we should use to set the region we see?
There is no regionThatFits:edgePadding: by the way.
A
MKCoordinateRegionis defined using degrees coordinate of typeCLLocationCoordinate2Dwhich represents the latitude and longitude of a point on the surface of the globe.MKMapRectrepresents an actual flat rectangle defined with view coordinate (x, y) on your map view.You can use functions to do conversions for you like MKCoordinateRegionForMapRect
See http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MapKitFunctionsReference/Reference/reference.html
And to answer your final question, you would use
MKCoordinateRegionwhich will define what region of the globe’s surface you want to see and by definition it will set your zoom level.