The effect is similar to the JS Library of checkbox effects, select learning IOS programming source code, a good reference.

LICENSE.txt
README.md
SSCheckBoxView
SSCheckBoxViewDemo.xcodeproj
............................\project.pbxproj
............................\project.xcworkspace
............................\...................\contents.xcworkspacedata
............................\...................\xcuserdata
............................\...................\..........\ardalahmet.xcuserdatad
............................\...................\..........\......................\UserInterfaceState.xcuserstate
............................\...................\..........\......................\WorkspaceSettings.xcsettings
............................\xcuserdata
............................\..........\ardalahmet.xcuserdatad
............................\..........\......................\xcschemes
............................\..........\......................\.........\SSCheckBoxView.xcscheme
............................\..........\......................\.........\xcschememanagement.plist
..............\en.lproj
..............\........\InfoPlist.strings
..............\........\MainWindow.xib
..............\........\SSCheckBoxViewViewController.xib
..............\main.m
..............\SSCheckBoxView
..............\SSCheckBoxViewAppDelegate.h
..............\SSCheckBoxViewAppDelegate.m
..............\SSCheckBoxViewDemo-Info.plist
..............\SSCheckBoxViewDemo-Prefix.pch
..............\SSCheckBoxViewViewController.h
..............\SSCheckBoxViewViewController.m
..............\..............\Graphics
..............\..............\........\cb_box_off.png
..............\..............\........\cb_box_off@2x.png
..............\..............\........\cb_box_on.png
..............\..............\........\cb_box_on@2x.png
..............\..............\........\cb_dark_off.png
..............\..............\........\cb_dark_off@2x.png
..............\..............\........\cb_dark_on.png
..............\..............\........\cb_dark_on@2x.png
..............\..............\........\cb_glossy_off.png
..............\..............\........\cb_glossy_off@2x.png
..............\..............\........\cb_glossy_on.png
..............\..............\........\cb_glossy_on@2x.png
..............\..............\........\cb_green_off.png
..............\..............\........\cb_green_off@2x.png
..............\..............\........\cb_green_on.png
..............\..............\........\cb_green_on@2x.png
..............\..............\........\cb_mono_off.png
..............\..............\........\cb_mono_off@2x.png
..............\..............\........\cb_mono_on.png
..............\..............\........\cb_mono_on@2x.png
..............\..............\Helpers
..............\..............\.......\UIHelpers.h
..............\..............\.......\UIHelpers.m
..............\..............\SSCheckBoxView.h
..............\..............\SSCheckBoxView.m

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