iOS - Fundamentals, Real-world Applications
https://developer.apple.com/library/content/reference library/Getting Started/Develop iOS Apps/
https://www.tutorialspoint.com/ios/ios actions and outlets
https://code.tutsplus.com/series/beginning ios development
https://www.raywenderlich.com/category ios
https://www.gcflearnfree.org/iphonebasics/using ios
https://www.w3schools.in/swift tutorial/
https://cs4720.cs.virginia.edu/slides/CS4720 MAD iOSArchitecture.pdf