Learn singleton class and use of static and final keywords

learn singleton class and use of singleton class. use of final and static keywords.
Singleton class according to apple: https://developer.apple.com/documenta...
Final keyword according to apple: https://developer.apple.com/swift/blo...

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Video playlist for advance video sessions:
   • iOS Advance  

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Tutorial code samples on Github
https://github.com/harendra2008gwl