Description: Use the CoreAnimation custom UIControl, select learning IOS programming source code, a good reference.
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File list (Check if you may need any files):
Classes
.......\RiskCursorAppDelegate.h
.......\RiskCursorAppDelegate.m
.......\RiskCursorViewController.h
.......\RiskCursorViewController.m
.......\SQRiskCursor.h
.......\SQRiskCursor.m
main.m
MainWindow.xib
NSString+SQ.h
NSString+SQ.m
README
RiskCursor-Info.plist
RiskCursor.xcodeproj
....................\nse.pbxuser
....................\nse.perspectivev3
....................\nst.pbxuser
....................\nst.perspectivev3
....................\project.pbxproj
RiskCursorViewController.xib
RiskCursor_Prefix.pch
UIColor+SQ.h
UIColor+SQ.m
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