The drop-down box assembly, need to self comboBox, select learning IOS programming source code, a good reference.

comboBox
........\Classes
........\.......\comboBoxAppDelegate.h
........\.......\comboBoxAppDelegate.m
........\.......\comboBoxViewController.h
........\.......\comboBoxViewController.m
........\.......\list_ico_d.png
........\comboBox-Info.plist
........\comboBox.xcodeproj
........\..................\apple.mode1v3
........\..................\apple.pbxuser
........\..................\project.pbxproj
........\ComboBoxView.h
........\ComboBoxView.m
........\comboBoxViewController.xib
........\comboBox_Prefix.pch
........\main.m
........\MainWindow.xib
__MACOSX
........\comboBox
........\........\._ComboBoxView.h
........\........\._ComboBoxView.m
........\........\Classes
........\........\.......\._comboBoxViewController.h
........\........\.......\._comboBoxViewController.m

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