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See:https://github.com/maximbilan/ios_airdrop_custom_data

var excludedActivities: [Any] = [.postToTwitter, .postToFacebook, .postToWeibo, .message, .mail, .print, .copyToPasteboard, .assignToContact, .saveToCameraRoll, .addToReadingList, .postToFlickr, .postToVimeo, .postToTencentWeibo] as? [Any]