UI multithreading example NSThread, select learning IOS programming source code, a good reference.

NSThread
........\.DS_Store
........\build
........\.....\Debug-iphoneos
........\.....\..............\TutorialProject.app
........\.....\..............\TutorialProject.app.dSYM
........\.....\..............\........................\Contents
........\.....\..............\........................\........\Info.plist
........\.....\..............\........................\........\Resources
........\.....\..............\........................\........\.........\DWARF
........\.....\..............\........................\........\.........\.....\TutorialProject
........\.....\..............\...................\CodeResources
........\.....\..............\...................\embedded.mobileprovision
........\.....\..............\...................\Extra_Xcode_100x100.png
........\.....\..............\...................\Extra_Xcode_57x57.png
........\.....\..............\...................\Info.plist
........\.....\..............\...................\MainWindow.nib
........\.....\..............\...................\PkgInfo
........\.....\..............\...................\ResourceRules.plist
........\.....\..............\...................\TutorialProject
........\.....\..............\...................\TutorialProjectViewController.nib
........\.....\..............\...................\_CodeSignature
........\.....\..............\...................\..............\CodeResources
........\.....\Debug-iphonesimulator
........\.....\.....................\TutorialProject.app
........\.....\.....................\TutorialProject.app.dSYM
........\.....\.....................\........................\Contents
........\.....\.....................\........................\........\Info.plist
........\.....\.....................\........................\........\Resources
........\.....\.....................\........................\........\.........\DWARF
........\.....\.....................\........................\........\.........\.....\TutorialProject
........\.....\.....................\...................\Info.plist
........\.....\.....................\...................\MainWindow.nib
........\.....\.....................\...................\PkgInfo
........\.....\.....................\...................\TutorialProject
........\.....\.....................\...................\TutorialProjectViewController.nib
........\.....\TutorialProject.build
........\.....\.....................\Debug-iphoneos
........\.....\.....................\..............\TutorialProject.build
........\.....\.....................\..............\.....................\build-state.dat
........\.....\.....................\..............\.....................\build-state~.dat
........\.....\.....................\..............\.....................\Objects-normal
........\.....\.....................\..............\.....................\..............\armv6
........\.....\.....................\..............\.....................\..............\.....\main.o
........\.....\.....................\..............\.....................\..............\.....\TutorialProject.LinkFileList
........\.....\.....................\..............\.....................\..............\.....\TutorialProjectAppDelegate.o
........\.....\.....................\..............\.....................\..............\.....\TutorialProjectViewController.o
........\.....\.....................\..............\.....................\..............\.....\TutorialProjectViewController.o~$
........\.....\.....................\..............\.....................\..............\.....\TutorialProjectViewController.o~_
........\.....\.....................\..............\.....................\TutorialProject-all-target-headers.hmap
........\.....\.....................\..............\.....................\TutorialProject-generated-files.hmap
........\.....\.....................\..............\.....................\TutorialProject-own-target-headers.hmap
........\.....\.....................\..............\.....................\TutorialProject-project-headers.hmap
........\.....\...............

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