A block of demo talk in great detail, it is suitable for beginners to learn next. See it useful

BlocksTest
..........\BlocksTest
..........\..........\AppDelegate.h
__MACOSX
........\BlocksTest
........\..........\BlocksTest
........\..........\..........\._AppDelegate.h
BlocksTest\BlocksTest\AppDelegate.m
__MACOSX\BlocksTest\BlocksTest\._AppDelegate.m
BlocksTest\BlocksTest\BlocksTest-Info.plist
..........\..........\BlocksTest-Prefix.pch
__MACOSX\BlocksTest\BlocksTest\._BlocksTest-Prefix.pch
BlocksTest\BlocksTest\en.lproj
..........\..........\........\InfoPlist.strings
__MACOSX\BlocksTest\BlocksTest\en.lproj
........\..........\..........\........\._InfoPlist.strings
BlocksTest\BlocksTest\en.lproj\ViewController.xib
__MACOSX\BlocksTest\BlocksTest\en.lproj\._ViewController.xib
BlocksTest\BlocksTest\main.m
__MACOSX\BlocksTest\BlocksTest\._main.m
BlocksTest\BlocksTest\ViewController.h
__MACOSX\BlocksTest\BlocksTest\._ViewController.h
BlocksTest\BlocksTest\ViewController.m
__MACOSX\BlocksTest\BlocksTest\._ViewController.m
BlocksTest\BlocksTest.xcodeproj
..........\....................\project.pbxproj
..........\....................\project.xcworkspace
..........\....................\...................\contents.xcworkspacedata
..........\....................\...................\xcuserdata
..........\....................\...................\..........\pengfeishi.xcuserdatad
..........\....................\...................\..........\......................\UserInterfaceState.xcuserstate
..........\....................\xcuserdata
..........\....................\..........\pengfeishi.xcuserdatad
..........\....................\..........\......................\xcdebugger
..........\....................\..........\......................\..........\Breakpoints.xcbkptlist
..........\....................\..........\......................\xcschemes
..........\....................\..........\......................\.........\BlocksTest.xcscheme
..........\....................\..........\......................\.........\xcschememanagement.plist
..........\CustomAlertView.h
__MACOSX\BlocksTest\._CustomAlertView.h
BlocksTest\CustomAlertView.m
__MACOSX\BlocksTest\._CustomAlertView.m

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