KVO is useful in the development of iOS technology,, namely: the Key- Value Observing, it provides a mechanism, when the specified object s properties is modified, the object will receive the notice. Simple said is observed each specified properties of the object has been modified, the KVO will automatically inform the corresponding observer.

testkvokvc
..........\.DS_Store
__MACOSX
........\testkvokvc
........\..........\._.DS_Store
testkvokvc\.git
..........\....\branches
..........\....\config
..........\....\description
..........\....\HEAD
..........\....\hooks
..........\....\.....\applypatch-msg.sample
..........\....\.....\commit-msg.sample
..........\....\.....\post-update.sample
..........\....\.....\pre-applypatch.sample
..........\....\.....\pre-commit.sample
..........\....\.....\pre-push.sample
..........\....\.....\pre-rebase.sample
..........\....\.....\prepare-commit-msg.sample
..........\....\.....\update.sample
..........\....\index
..........\....\info
..........\....\....\exclude
__MACOSX\testkvokvc\.git
........\..........\....\info
........\..........\....\....\._exclude
testkvokvc\.git\objects
..........\....\.......\0c
..........\....\.......\..\08a7ab0336e8899025de03b1e486064c74bdcd
..........\....\.......\25
..........\....\.......\..\fcbe66785f1bbcbf1346707b58bc69f60cd52b
..........\....\.......\42
..........\....\.......\..\38460236c47facdb6c7304d75a508004465ea8
..........\....\.......\47
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..........\....\.......\4b
..........\....\.......\..\a233fdd82d5ab9f896b8f0923cf27792117d1a
..........\....\.......\65
..........\....\.......\..\710a0a39fdb70b900c13af58ccd35966ddd58f
..........\....\.......\7c
..........\....\.......\..\18c42b80a262d135ad0b642d435223d668d159
..........\....\.......\7d
..........\....\.......\..\95054ecc556acf3bb1259a028d832fae68a039
..........\....\.......\89
..........\....\.......\..\ef09a455e94b5acb0e9d90040f73629b5bcd3f
..........\....\.......\a0
..........\....\.......\..\ad363c85ee8f1d5cee49497bcd1b288f121f94
..........\....\.......\a1
..........\....\.......\..\85e8a5dfac5f5d9ec1d37380ad4efa54599332
..........\....\.......\a4
..........\....\.......\..\645e6b015d651533a5afb566a03ebdc78af5cc
..........\....\.......\b1
..........\....\.......\..\a900bac749b682d0e6bb26fb60f0cb7564ca9c
..........\....\.......\c0
..........\....\.......\..\79b8ab2909c20cbcfc0d7c5d18e0c83e3a6fa8
..........\....\.......\d1
..........\....\.......\..\f358d2fe54ac5e1a9ccdf52b69b7871586edad
..........\....\.......\fa
..........\....\.......\..\c2bd5d1c6d3878a56496a2c2e7646cedd4e329
..........\....\.......\fe
..........\....\.......\..\98ca4add97f600cc08c0016443bfeea51fe990
..........\....\.......\info
..........\....\.......\pack
..........\....\refs
..........\....\....\heads
..........\....\....\tags
..........\testkvokvc
..........\..........\AppDelegate.h
__MACOSX\testkvokvc\testkvokvc
........\..........\..........\._AppDelegate.h
testkvokvc\testkvokvc\AppDelegate.m
__MACOSX\testkvokvc\testkvokvc\._AppDelegate.m
testkvokvc\testkvokvc\Base.lproj
..........\..........\..........\Main.storyboard
__MACOSX\testkvokvc\testkvokvc\Base.lproj
........\..........\..........\..........\._Main.storyboard
testkvokvc\testkvokvc\en.lproj
..........\..........\........\InfoPlist.strings
__MACOSX\testkvokvc\testkvokvc\en.lproj
........\..........\..........\........\._InfoPlist.strings
testkvokvc\testkvokvc\Images.xcassets
..........\..........\...............\AppIcon.appiconset
..........\..........\...............\..................\Contents.json
__MACOSX\testkvokvc\testkvokvc\Images.xcassets
........\..........\..........\...............\AppIcon.appiconset
........\..........\..........\...............\..................\._Contents.json
testkvokvc\testkvokvc\Images.xcassets\LaunchImage.launchimage
..........\..........\...............\.......................\Contents.json
__MACOSX\testkvokvc\testkvokvc\Images.xcassets\LaunchImage.launchimage
........\..........\..........\...............\.......................\._Contents.json
testkvokvc\testkvokvc\main.m
__MACOSX\testkvokvc\testkvokvc\._main.m
testkvokvc\testkvokvc\testkvokvc-Info.plist
..........\..........\testkvokvc-Prefix.pch
__MACOSX\testkvokvc\testkvokvc\._testkvokvc-Prefix.pch
testkvokvc\testkvokvc\ViewController.h
__MACOSX\testkvokvc\testkvokvc\._ViewController.h
testkvokvc\testkvokvc\ViewController.m
__MACOSX\

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