Clicking on the input box pops up when the keyboard input, the view moves upward so that the user can see the input content, select learning IOS programming source code, a good reference.

.gitignore
class
.....\HPGrowingTextView.h
.....\HPGrowingTextView.m
.....\HPTextViewInternal.h
.....\HPTextViewInternal.m
example
.......\Classes
.......\.......\GrowingTextViewExampleAppDelegate.h
.......\.......\GrowingTextViewExampleAppDelegate.m
.......\.......\GrowingTextViewExampleViewController.h
.......\.......\GrowingTextViewExampleViewController.m
.......\GrowingTextViewExample-Info.plist
.......\GrowingTextViewExample.xcodeproj
.......\................................\project.pbxproj
.......\................................\project.xcworkspace
.......\................................\...................\contents.xcworkspacedata
.......\................................\xcuserdata
.......\................................\..........\Hans.xcuserdatad
.......\................................\..........\................\xcschemes
.......\................................\..........\................\.........\GrowingTextViewExample.xcscheme
.......\................................\..........\................\.........\xcschememanagement.plist
.......\GrowingTextViewExample_Prefix.pch
.......\main.m
.......\MainWindow.xib
.......\MessageEntryBackground.png
.......\MessageEntryBackground@2x.png
.......\MessageEntryInputField.png
.......\MessageEntryInputField@2x.png
.......\MessageEntrySendButton.png
.......\MessageEntrySendButton@2x.png
.......\MessageEntrySendButtonPressed.png
.......\MessageEntrySendButtonPressed@2x.png
LICENSE.txt
README.md

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