MultiDownloader multi thread and multi task HTTP download, select learning IOS programming source code, a good reference.

MultiDownloader
...............\.DS_Store
...............\MultiDownloader
...............\MultiDownloader.xcodeproj
...............\.........................\project.pbxproj
...............\.........................\project.xcworkspace
...............\.........................\...................\contents.xcworkspacedata
...............\.........................\...................\xcuserdata
...............\.........................\...................\..........\admin.xcuserdatad
...............\.........................\...................\..........\.................\UserInterfaceState.xcuserstate
...............\.........................\xcuserdata
...............\.........................\..........\admin.xcuserdatad
...............\.........................\..........\.................\xcdebugger
...............\.........................\..........\.................\..........\Breakpoints.xcbkptlist
...............\.........................\..........\.................\xcschemes
...............\.........................\..........\.................\.........\MultiDownloader.xcscheme
...............\.........................\..........\.................\.........\xcschememanagement.plist
...............\MultiDownloaderTests
...............\....................\en.lproj
...............\....................\........\InfoPlist.strings
...............\....................\MultiDownloaderTests-Info.plist
...............\....................\MultiDownloaderTests-Prefix.pch
...............\....................\MultiDownloaderTests.h
...............\....................\MultiDownloaderTests.m
...............\...............\en.lproj
...............\...............\........\InfoPlist.strings
...............\...............\........\MainWindow.xib
...............\...............\........\MultiDownloaderViewController.xib
...............\...............\main.m
...............\...............\MultiDownloader-Info.plist
...............\...............\MultiDownloader-Prefix.pch
...............\...............\MultiDownloaderAppDelegate.h
...............\...............\MultiDownloaderAppDelegate.m
...............\...............\MultiDownloaderViewController.h
...............\...............\MultiDownloaderViewController.m
...............\...............\MultiTaskDownloader.h
...............\...............\MultiTaskDownloader.m
...............\...............\MultiThreadDownloader.h
...............\...............\MultiThreadDownloader.m
...............\...............\OperationThread.h
...............\...............\OperationThread.m
__MACOSX
........\MultiDownloader
........\...............\._.DS_Store
........\...............\MultiDownloader
........\...............\MultiDownloaderTests
........\...............\....................\._MultiDownloaderTests-Prefix.pch
........\...............\....................\._MultiDownloaderTests.h
........\...............\....................\._MultiDownloaderTests.m
........\...............\....................\en.lproj
........\...............\....................\........\._InfoPlist.strings
........\...............\...............\._main.m
........\...............\...............\._MultiDownloader-Prefix.pch
........\...............\...............\._MultiDownloaderAppDelegate.h
........\...............\...............\._MultiDownloaderAppDelegate.m
........\...............\...............\._MultiDownloaderViewController.h
........\...............\...............\._MultiDownloaderViewController.m
........\...............\...............\._MultiTaskDownloader.h
........\...............\...............\._MultiTaskDownloader.m
........\...............\...............\._MultiThreadDownloader.h
........\...............\...............\._MultiThreadDownloader.m
........\...............\...............\._OperationThread.h
........\...............\...............\._OperationThread.m
........\...............\...............\en.lproj
........\...............\...............\........\._InfoPlist.strings
........\...............\...............\........\._MainWindow.xib

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