File list (Check if you may need any files):
IOSHelloWorld\.DS_Store
.............\._.DS_Store
.............\._build
.............\._IOS_Chapter2_1-Info.plist
.............\build\.DS_Store
.............\.....\._.DS_Store
.............\.....\._IOS_Chapter2_1.build
.............\.....\Debug-iphonesimulator\IOS_Chapter2_1.app\Default.png
.............\.....\.....................\..................\Info.plist
.............\.....\.....................\..................\IOS_Chapter2_1
.............\.....\.....................\..................\IOS_Chapter2_1ViewController.nib
.............\.....\.....................\..................\MainWindow.nib
.............\.....\.....................\..................\PkgInfo
.............\.....\.....................\..................\siginin.png
.............\.....\.....................\IOS_Chapter2_1.app
.............\.....\.....................\...................dSYM\Contents\Info.plist
.............\.....\.....................\.......................\........\Resources\DWARF\IOS_Chapter2_1
.............\.....\.....................\.......................\........\.........\DWARF
.............\.....\.....................\.......................\........\Resources
.............\.....\.....................\.......................\Contents
.............\.....\.....................\IOS_Chapter2_1.app.dSYM
.............\.....\Debug-iphonesimulator
.............\.....\IOS_Chapter2_1.build\.DS_Store
.............\.....\....................\._.DS_Store
.............\.....\....................\._IOS_Chapter2_1.pbxindex
.............\.....\....................\Debug-iphoneos\IOS_Chapter2_1.build\build-state.dat
.............\.....\....................\..............\....................\build-state~.dat
.............\.....\....................\..............\....................\IOS_Chapter2_1.dep
.............\.....\....................\..............\....................\IOS_Chapter2_1~.dep
.............\.....\....................\..............\IOS_Chapter2_1.build
.............\.....\....................\Debug-iphoneos
.............\.....\....................\............simulator\IOS_Chapter2_1.build\build-state.dat
.............\.....\....................\.....................\....................\build-state~.dat
.............\.....\....................\.....................\....................\IOS_Chapter2_1-all-target-headers.hmap
.............\.....\....................\.....................\....................\IOS_Chapter2_1-generated-files.hmap
.............\.....\....................\.....................\....................\IOS_Chapter2_1-own-target-headers.hmap
.............\.....\....................\.....................\....................\IOS_Chapter2_1-project-headers.hmap
.............\.....\....................\.....................\....................\IOS_Chapter2_1.dep
.............\.....\....................\.....................\....................\IOS_Chapter2_1.hmap
.............\.....\....................\.....................\....................\IOS_Chapter2_1~.dep
.............\.....\....................\.....................\....................\Objects-normal\i386\IOS_Chapter2_1.LinkFileList
.............\.....\....................\.....................\....................\..............\....\IOS_Chapter2_1AppDelegate.o
.............\.....\....................\.....................\....................\..............\....\IOS_Chapter2_1ViewController.o
.............\.....\....................\.....................\....................\..............\....\main.o
.............\.....\....................\.....................\....................\..............\i386
.............\.....\....................\.....................\....................\Objects-normal
.............\.....\....................\.....................\IOS_Chapter2_1.build
.............\.....\....................\Debug-iphonesimulator
.............\.....\....................\IOS_Chapter2_1.pbxindex\categories.pbxbtree
.............\.....\....................\.......................\cdecls.pbxbtree
.............\.....\....