MAC or IOS source code on the basis of class, you can refer

FoundationDemo1
...............\.DS_Store
__MACOSX
........\FoundationDemo1
........\...............\._.DS_Store
FoundationDemo1\FoundationDemo1
...............\...............\FoundationDemo1-Prefix.pch
__MACOSX\FoundationDemo1\FoundationDemo1
........\...............\...............\._FoundationDemo1-Prefix.pch
FoundationDemo1\FoundationDemo1\FoundationDemo1.1
__MACOSX\FoundationDemo1\FoundationDemo1\._FoundationDemo1.1
FoundationDemo1\FoundationDemo1\main.m
__MACOSX\FoundationDemo1\FoundationDemo1\._main.m
FoundationDemo1\FoundationDemo1.xcodeproj
...............\.........................\project.pbxproj
...............\.........................\project.xcworkspace
...............\.........................\...................\contents.xcworkspacedata
...............\.........................\...................\xcuserdata
...............\.........................\...................\..........\elite.xcuserdatad
...............\.........................\...................\..........\.................\UserInterfaceState.xcuserstate
...............\.........................\xcuserdata
...............\.........................\..........\elite.xcuserdatad
...............\.........................\..........\.................\xcdebugger
...............\.........................\..........\.................\..........\Breakpoints.xcbkptlist
...............\.........................\..........\.................\xcschemes
...............\.........................\..........\.................\.........\FoundationDemo1.xcscheme
...............\.........................\..........\.................\.........\xcschememanagement.plist
__MACOSX\FoundationDemo1\._FoundationDemo1.xcodeproj

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