GMSPlacePhotoMetadata
@interface GMSPlacePhotoMetadata : NSObjectThe metadata corresponding to a single photo associated with a place.
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                  The data provider attribution string for this photo. These are provided as a NSAttributedString, which may contain hyperlinks to the website of each provider. In general, these must be shown to the user if data from this GMSPlacePhotoMetadatais shown, as described in the Places SDK Terms of Service.DeclarationSwift @NSCopying var attributions: NSAttributedString? { get }Objective-C @property (nonatomic, copy, readonly, nullable) NSAttributedString *attributions;
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                  The author attributions that must be shown to the user if this photo is displayed. DeclarationSwift var authorAttributions: [GMSPlaceAuthorAttribution]? { get }Objective-C @property (nonatomic, copy, readonly, nullable) NSArray<GMSPlaceAuthorAttribution *> *authorAttributions;
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                  The maximum pixel size in which this photo is available. DeclarationSwift var maxSize: CGSize { get }Objective-C @property (nonatomic, readonly) CGSize maxSize;
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                  Unavailable Initializer is not available. DeclarationObjective-C - (nonnull instancetype)init;