How is the zoom level set for map view?

How does one set 开发者_开发知识库the zoom level on a mapview?

I have a map and when showing some locations, the name isnt displayed as the map isnt zoomed in enough.

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You don't explicitly set the zoom level for MKMapView, instead you set a visible region with a MKCoordinateRegion that includes a center point and the span of coordinates to display.