https://developer.apple.com/library/content/documentation/WindowsViews/Conceptual/WindowAndScreenGuide/UsingExternalDisplay/UsingExternalDisplay.html

https://stackoverflow.com/questions/5388884/airplay-button-on-custom-view-problems

https://stackoverflow.com/questions/44879210/ios-how-can-i-display-an-airplay-popup-menu-in-swift

https://stackoverflow.com/questions/12318377/how-to-customize-the-airplay-button-when-airplay-is-active

https://www.ioscreator.com/tutorials/volume-view-tutorial-ios8-swift

https://stackoverflow.com/questions/34115251/how-to-programmatically-discover-the-ios-devices-list-and-connect-for-mirroring

http://ios-xn.blogspot.in/2016/09/programmatically-show-airplay-mirroring.html