WKScriptMessage

@interface WKScriptMessage : NSObject

/*! @abstract The body of the message.
 @discussion Allowed types are NSNumber, NSString, NSDate, NSArray,
 NSDictionary, and NSNull.
 */
@property (nonatomic, readonly, copy) id body;

/*! @abstract The web view sending the message. */
@property (nullable, nonatomic, readonly, weak) WKWebView *webView;

/*! @abstract The frame sending the message. */
@property (nonatomic, readonly, copy) WKFrameInfo *frameInfo;

/*! @abstract The name of the message handler to which the message is sent.
 */
@property (nonatomic, readonly, copy) NSString *name;