A demonstration objective-c under the agreement with the agent of the sample program, write their own, and hope that they can inspire or help

protocol_demo
.............\protocol_demo
.............\protocol_demo.xcodeproj
.............\.......................\project.pbxproj
.............\.......................\project.xcworkspace
.............\.......................\...................\contents.xcworkspacedata
.............\.......................\...................\xcuserdata
.............\.......................\...................\..........\kyle.xcuserdatad
.............\.......................\...................\..........\................\UserInterfaceState.xcuserstate
.............\.......................\xcuserdata
.............\.......................\..........\kyle.xcuserdatad
.............\.......................\..........\................\xcdebugger
.............\.......................\..........\................\..........\Breakpoints.xcbkptlist
.............\.......................\..........\................\xcschemes
.............\.......................\..........\................\.........\protocol_demo.xcscheme
.............\.......................\..........\................\.........\xcschememanagement.plist
.............\.............\._main.m
.............\.............\._protocol_demo-Prefix.pch
.............\.............\._protocol_demo.1
.............\.............\._TestClass.h
.............\.............\._TestClass.m
.............\.............\._TestProtocol.h
.............\.............\main.m
.............\.............\protocol_demo-Prefix.pch
.............\.............\protocol_demo.1
.............\.............\TestClass.h
.............\.............\TestClass.m
.............\.............\TestProtocol.h

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