https://developer.apple.com/swift/resources/
TabBarController
https://developer.apple.com/documentation
sample and code
https://developer.apple.com/library/content/navigation/
started develop iOS by swift
https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/index.html#//apple_ref/doc/uid/TP40015214
https://developer.apple.com/library/content/documentation/WindowsViews/Conceptual/ViewControllerCatalog/Chapters/TabBarControllers.html
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