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NS_ENUM
Passed to open to indicate which default audience to use for sessions that post data to Facebook.
typedef NS_ENUM(NSUInteger, FBSDKDefaultAudience) {
FBSDKDefaultAudienceFriends = 0,
FBSDKDefaultAudienceOnlyMe,
FBSDKDefaultAudienceEveryone,
};
Constant Description
FBSDKDefaultAudienceFriends
Indicates that the user's friends are able to see posts made by the application
Discussion:
Certain operations such as publishing a status or publishing a photo require an audience. When the user grants an application permission to perform a publish operation, a default audience is selected as the publication ceiling for the application. This enumerated value allows the application to select which audience to ask the user to grant publish permission for.
Declared In: FBSDKLoginManager.h
更多信息:https://developers.facebook.com/docs/reference/ios/current/class/FBSDKLoginManager/