MGLCompassButton
@interface MGLCompassButton : UIImageView
                A specialized view that displays the current compass heading for its associated map.
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The visibility of the compass button.
You can configure a compass button to be visible all the time or only when the compass heading changes.
Declaration
Objective-C
@property (nonatomic) MGLOrnamentVisibility compassVisibility;Swift
var compassVisibility: MGLOrnamentVisibility { get set } 
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        MGLCompassButton Class Reference