官方网站的例子，摘自别人的博客。谢谢原博客的分享。http://blog.csdn.net/cocoa_geforce/article/details/6717377
http://developer.apple.com/iphone/library/samplecode/Reachability/Reachability.zip
http://developer.apple.com/iphone/library/samplecode/avTouch/avTouch.zip
http://developer.apple.com/iphone/library/samplecode/AdvancedURLConnections/AdvancedURLConnections.zip
http://developer.apple.com/iphone/library/samplecode/LocateMe/LocateMe.zip
http://developer.apple.com/iphone/library/samplecode/SimpleFTPSample/SimpleFTPSample.zip
http://developer.apple.com/iphone/library/samplecode/XMLPerformance/XMLPerformance.zip
http://developer.apple.com/iphone/library/samplecode/iPhoneMultichannelMixerTest/iPhoneMultichannelMixerTest.zip
http://developer.apple.com/iphone/library/samplecode/GLES2Sample/GLES2Sample.zip
http://developer.apple.com/iphone/library/samplecode/GLPaint/GLPaint.zip
http://developer.apple.com/iphone/library/samplecode/GLGravity/GLGravity.zip
http://developer.apple.com/iphone/library/samplecode/WeatherMap/WeatherMap.zip
http://developer.apple.com/iphone/library/samplecode/Touches/Touches.zip
http://developer.apple.com/iphone/library/samplecode/Formulaic/Formulaic.zip
http://developer.apple.com/iphone/library/samplecode/oalTouch/oalTouch.zip
http://developer.apple.com/iphone/library/samplecode/UICatalog/UICatalog.zip
http://developer.apple.com/iphone/library/samplecode/TouchCells/TouchCells.zip
http://developer.apple.com/iphone/library/samplecode/TaggedLocations/TaggedLocations.zip
http://developer.apple.com/iphone/library/samplecode/Locations/Locations.zip
http://developer.apple.com/iphone/library/samplecode/HeaderFooter/HeaderFooter.zip
http://developer.apple.com/iphone/library/samplecode/GLImageProcessing/GLImageProcessing.zip
http://developer.apple.com/iphone/library/samplecode/CoreDataBooks/CoreDataBooks.zip
http://developer.apple.com/iphone/library/samplecode/AppPrefs/AppPrefs.zip
http://developer.apple.com/iphone/library/samplecode/AdvancedTableViewCells/AdvancedTableViewCells.zip
http://developer.apple.com/iphone/library/samplecode/ViewTransitions/ViewTransitions.zip
http://developer.apple.com/iphone/library/samplecode/MoveMe/MoveMe.zip
http://developer.apple.com/iphone/library/samplecode/LazyTableImages/LazyTableImages.zip
http://developer.apple.com/iphone/library/samplecode/CopyPasteTile/CopyPasteTile.zip
http://developer.apple.com/iphone/library/samplecode/AccelerometerGraph/AccelerometerGraph.zip
http://developer.apple.com/iphone/library/samplecode/AQOfflineRenderTest/AQOfflineRenderTest.zip
http://developer.apple.com/iphone/library/samplecode/Teslameter/Teslameter.zip
http://developer.apple.com/iphone/library/samplecode/SimpleEKDemo/SimpleEKDemo.zip
http://developer.apple.com/iphone/library/samplecode/MessageComposer/MessageComposer.zip
http://developer.apple.com/iphone/library/samplecode/iPhoneMixerEQGraphTest/iPhoneMixerEQGraphTest.zip
http://developer.apple.com/iphone/library/samplecode/iPhoneCoreDataRecipes/iPhoneCoreDataRecipes.zip
http://developer.apple.com/iphone/library/samplecode/WorldCities/WorldCities.zip
http://developer.apple.com/iphone/library/samplecode/SeismicXML/SeismicXML.zip
http://developer.apple.com/iphone/library/samplecode/Reflection/Reflection.zip
http://developer.apple.com/iphone/library/samplecode/QuickContacts/QuickContacts.zip
http://developer.apple.com/iphone/library/samplecode/QuartzDemo/QuartzDemo.zip
http://developer.apple.com/iphone/library/samplecode/PVRTextureLoader/PVRTextureLoader.zip
http://developer.apple.com/iphone/library/samplecode/MapCallouts/MapCallouts.zip
http://developer.apple.com/iphone/library/samplecode/GLTextureAtlas/GLTextureAtlas.zip
http://developer.apple.com/iphone/library/samplecode/DateSectionTitles/DateSectionTitles.zip
http://developer.apple.com/iphone/library/samplecode/URLCache/URLCache.zip
http://developer.apple.com/iphone/library/samplecode/TransWeb/TransWeb.zip
http://developer.apple.com/iphone/library/samplecode/WhichWayIsUp/WhichWayIsUp.zip
http://developer.apple.com/iphone/library/samplecode/TableViewSuite/TableViewSuite.zip
http://developer.apple.com/iphone/library/samplecode/LaunchMe/LaunchMe.zip
http://developer.apple.com/iphone/library/samplecode/HelloWorld_iPhone/HelloWorld_iPhone.zip
http://developer.apple.com/iphone/library/samplecode/HeadsUpUI/HeadsUpUI.zip
http://developer.apple.com/iphone/library/samplecode/DrillDownSave/DrillDownSave.zip
http://developer.apple.com/iphone/library/samplecode/TheElements/TheElements.zip
http://developer.apple.com/iphone/library/samplecode/SimpleUndo/SimpleUndo.zip
http://developer.apple.com/iphone/library/samplecode/SimpleDrillDown/SimpleDrillDown.zip
http://developer.apple.com/iphone/library/samplecode/Scrolling/Scrolling.zip
http://developer.apple.com/iphone/library/samplecode/PageControl/PageControl.zip
http://developer.apple.com/iphone/library/samplecode/NavBar/NavBar.zip
http://developer.apple.com/iphone/library/samplecode/MusicCube/MusicCube.zip
http://developer.apple.com/iphone/library/samplecode/Metronome/Metronome.zip
http://developer.apple.com/iphone/library/samplecode/CurrentAddress/CurrentAddress.zip
http://developer.apple.com/iphone/library/samplecode/AlternateViews/AlternateViews.zip
http://developer.apple.com/iphone/library/samplecode/Accessory/Accessory.zip
http://developer.apple.com/iphone/library/samplecode/MailComposer/MailComposer.zip
http://developer.apple.com/iphone/library/samplecode/iPhoneUnitTests/iPhoneUnitTests.zip
http://developer.apple.com/iphone/library/samplecode/TopSongs/TopSongs.zip
http://developer.apple.com/iphone/library/samplecode/TableSearch/TableSearch.zip
http://developer.apple.com/iphone/library/samplecode/DateCell/DateCell.zip
http://developer.apple.com/iphone/library/samplecode/InternationalMountains/InternationalMountains.zip
http://developer.apple.com/iphone/library/samplecode/BubbleLevel/BubbleLevel.zip
http://developer.apple.com/iphone/library/samplecode/BonjourWeb/BonjourWeb.zip
http://developer.apple.com/iphone/library/samplecode/ScrollViewSuite/ScrollViewSuite.zip
http://developer.apple.com/iphone/library/samplecode/Trailers.dcproj/Trailers.dcproj.zip
http://developer.apple.com/iphone/library/samplecode/SimpleGestureRecognizers/SimpleGestureRecognizers.zip
http://developer.apple.com/iphone/library/samplecode/MultipleDetailViews/MultipleDetailViews.zip
http://developer.apple.com/iphone/library/samplecode/ToolbarSearch/ToolbarSearch.zip
http://developer.apple.com/iphone/library/samplecode/KeyboardAccessory/KeyboardAccessory.zip
http://developer.apple.com/iphone/library/samplecode/TopPaid/TopPaid.zip
http://developer.apple.com/iphone/library/samplecode/GKRocket/GKRocket.zip
http://developer.apple.com/iphone/library/samplecode/FastEnumerationSample/FastEnumerationSample.zip
http://developer.apple.com/iphone/library/samplecode/GLSprite/GLSprite.zip
http://developer.apple.com/iphone/library/samplecode/AddMusic/AddMusic.zip
http://developer.apple.com/iphone/library/samplecode/SimpleURLConnections/SimpleURLConnections.zip
http://developer.apple.com/iphone/library/samplecode/SimpleNetworkStreams/SimpleNetworkStreams.zip
http://developer.apple.com/iphone/library/samplecode/iPhoneExtAudioFileConvertTest/iPhoneExtAudioFileConvertTest.zip
http://developer.apple.com/iphone/library/samplecode/aurioTouch/aurioTouch.zip
http://developer.apple.com/iphone/library/samplecode/SpeakHere/SpeakHere.zip
http://developer.apple.com/iphone/library/samplecode/GKTank/GKTank.zip
http://developer.apple.com/iphone/library/samplecode/WiTap/WiTap.zip
http://developer.apple.com/iphone/library/samplecode/PhotoLocations/PhotoLocations.zip
http://developer.apple.com/iphone/library/samplecode/BatteryStatus/BatteryStatus.zip
http://developer.apple.com/iphone/library/samplecode/GenericKeychain/GenericKeychain.zip
http://developer.apple.com/iphone/library/samplecode/CryptoExercise/CryptoExercise.zip
http://developer.apple.com/iphone/library/samplecode/MoviePlayer_iPhone/MoviePlayer_iPhone.zip
http://developer.apple.com/iphone/library/samplecode/SysSound/SysSound.zip