Description: For iOS radio button, select learning IOS programming source code, a good reference.
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File list (Check if you may need any files):
RadioButton
RadioButton.xcodeproj
.....................\project.pbxproj
...........\en.lproj
...........\........\InfoPlist.strings
...........\........\MainWindow.xib
...........\........\RadioButtonViewController.xib
...........\main.m
...........\RadioButton-Info.plist
...........\RadioButton-Prefix.pch
...........\RadioButton-Selected.png
...........\RadioButton-Unselected.png
...........\RadioButton.h
...........\RadioButton.m
...........\RadioButtonAppDelegate.h
...........\RadioButtonAppDelegate.m
...........\RadioButtonViewController.h
...........\RadioButtonViewController.m