MGLForegroundStyleLayer
@interface MGLForegroundStyleLayer : MGLStyleLayer
                MGLForegroundStyleLayer is an abstract superclass for style layers whose
content is defined by an MGLSource object.
Create instances of MGLRasterStyleLayer and the concrete subclasses of
MGLVectorStyleLayer in order to use MGLForegroundStyleLayer‘s methods.
Do not create instances of MGLForegroundStyleLayer directly, and do not
create your own subclasses of this class.
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Identifier of the source from which the receiver obtains the data to style.
Declaration
Objective-C
@property (readonly, nonatomic, nullable) NSString *sourceIdentifier;Swift
var sourceIdentifier: String? { get } 
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        MGLForegroundStyleLayer Class Reference