ObjectiveC.md

Update of frameworks and comparisons.

• https://www.hackingwithswift.com/interviews/meng-to-swiftui-vs-react-vs-flutter
• https://steelkiwi.medium.com/swiftui-vs-uikit-benefits-and-drawbacks-6a540cced684
• https://steelkiwi.com/blog/swiftui-vs-uikit/

test drive swiftUI

• https://www.objc.io/blog/2020/05/19/swiftui-without-an-xcodeproj/

32 bit building

• https://github.com/mrpippy/XcodeNueve

docset

• https://github.com/SwiftDocOrg/DocSetUtil/tree/master
• https://gist.github.com/fzwo/01d62cebd21032683d87f51d094575d3

reading

• https://useyourloaf.com/categories/objective-c/
• https://github.com/lapcat

strong, weak, assign, copy, atomic nonatomic

• strong is default for object.

• weak does not increase object's ref count, and avoid retain cycles.

• retain and copy is for properties.

• see http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmPractical.html

• https://stackoverflow.com/questions/588866/whats-the-difference-between-the-atomic-and-nonatomic-attributes?rq=1

• https://stackoverflow.com/questions/4510913/objective-c-assign-copy-retain

• https://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain?rq=1