Drop Down

https://drive.google.com/file/d/0BzbR2CSFFWrJV3JXOGdEYjBnOHhqejRvSk1wZnZ2VndhVnFz/view

https://github.com/UnicornTV/Make-a-Dropdown-Menu-in-iOS/tree/master/PopoversTests

https://www.credera.com/blog/custom-application-development/creating-a-dropdown-field-in-swift-for-ios/

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