GMSMapStyle
@interface GMSMapStyle : NSObjectGMSMapStyle holds details about a style which can be applied to a map.
With style options you can customize the presentation of the standard Google map styles, changing the visual display of features like roads, parks, and other points of interest. As well as changing the style of these features, you can also hide features entirely. This means that you can emphasize particular components of the map or make the map complement the content of your app.
For more information see: https://developers.google.com/maps/documentation/ios-sdk/styling
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                  Creates a style using a string containing JSON. Returns nil and populates error(if provided) ifstyleis invalid.DeclarationSwift convenience init(jsonString style: String) throwsObjective-C + (nullable instancetype)styleWithJSONString:(nonnull NSString *)style error: (NSError *_Nullable *_Nullable)error;
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                  Creates a style using a file containing JSON. Returns nil and populates error(if provided) ifstyleis invalid, the file cannot be read, or the URL is not a file URL.DeclarationSwift convenience init(contentsOfFileURL fileURL: URL) throwsObjective-C + (nullable instancetype) styleWithContentsOfFileURL:(nonnull NSURL *)fileURL error:(NSError *_Nullable *_Nullable)error;