The tree structure of navigation, select learning IOS programming source code, a good reference.

.gitignore
Accordion1
..........\Accordion-Info.plist
..........\Accordion.xcodeproj
..........\...................\project.pbxproj
..........\Accordion_Prefix.pch
..........\Assets
..........\......\ascending.png
..........\......\descending.png
..........\......\Document512.png
..........\......\Document56.png
..........\......\Folder512.png
..........\......\Folder56.png
..........\......\Triangle.png
..........\......\TriangleSmall.png
..........\......\TriangleSmall2.png
..........\Classes
..........\.......\AppDelegate.h
..........\.......\AppDelegate.m
..........\.......\DetailViewController.h
..........\.......\DetailViewController.m
..........\.......\N4AccordionViewCell.h
..........\.......\N4AccordionViewCell.m
..........\.......\N4AccordionViewController.h
..........\.......\N4AccordionViewController.m
..........\.......\N4File.h
..........\.......\N4File.m
..........\.......\N4FileAccordionDatasourceManager.h
..........\.......\N4FileAccordionDatasourceManager.m
..........\.......\N4FileSorterViewController.h
..........\.......\N4FileSorterViewController.m
..........\.......\N4FileView.h
..........\.......\N4FileView.m
..........\.......\N4PromptAlertView.h
..........\.......\N4PromptAlertView.m
..........\DetailView.xib
..........\licence.txt
..........\main.m
..........\MainWindow.xib
..........\N4AccordionViewController.xib
Accordion2
..........\Accordion2-Info.plist
..........\Accordion2.xcodeproj
..........\....................\project.pbxproj
..........\Accordion2_Prefix.pch
..........\Classes
..........\.......\AppDelegate.h
..........\.......\AppDelegate.m
..........\.......\DetailViewController.h
..........\.......\DetailViewController.m
..........\.......\GIAccordion.h
..........\.......\GIAccordion.m
..........\.......\GIAccordionViewCell.h
..........\.......\GIAccordionViewCell.m
..........\.......\GIAccordionViewController.h
..........\.......\GIAccordionViewController.m
..........\.......\GITree.h
..........\.......\GITree.m
..........\.......\GITreeNode.h
..........\.......\GITreeNode.m
..........\.......\MGGradientView.h
..........\.......\MGGradientView.m
..........\DetailView.xib
..........\directory44.png
..........\file44.png
..........\iPad
..........\....\MainWindow-iPad.xib
..........\licence.txt
..........\main.m
..........\MainWindow.xib
..........\selected.png
..........\triangleSmall.png
..........\unselected.png
README.markdown

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