Similar win8 boot interface showing the effect of the progress. There are five white dots in the loop rotation, you can set the color dots. The effect is great.

ETActivityIndicatorView
.......................\.DS_Store
__MACOSX
........\ETActivityIndicatorView
........\.......................\._.DS_Store
ETActivityIndicatorView\.gitignore
__MACOSX\ETActivityIndicatorView\._.gitignore
ETActivityIndicatorView\ETActivityIndicatorView
.......................\.......................\Circle.h
__MACOSX\ETActivityIndicatorView\ETActivityIndicatorView
........\.......................\.......................\._Circle.h
ETActivityIndicatorView\ETActivityIndicatorView\Circle.m
__MACOSX\ETActivityIndicatorView\ETActivityIndicatorView\._Circle.m
ETActivityIndicatorView\ETActivityIndicatorView\ETActivityIndicatorView.h
__MACOSX\ETActivityIndicatorView\ETActivityIndicatorView\._ETActivityIndicatorView.h
ETActivityIndicatorView\ETActivityIndicatorView\ETActivityIndicatorView.m
__MACOSX\ETActivityIndicatorView\ETActivityIndicatorView\._ETActivityIndicatorView.m
........\.......................\._ETActivityIndicatorView
ETActivityIndicatorView\example
.......................\.......\.DS_Store
__MACOSX\ETActivityIndicatorView\example
........\.......................\.......\._.DS_Store
ETActivityIndicatorView\example\ETActivityIndicatorView
.......................\.......\.......................\AppDelegate.h
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView
........\.......................\.......\.......................\._AppDelegate.h
ETActivityIndicatorView\example\ETActivityIndicatorView\AppDelegate.m
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._AppDelegate.m
ETActivityIndicatorView\example\ETActivityIndicatorView\Default-568h@2x.png
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._Default-568h@2x.png
ETActivityIndicatorView\example\ETActivityIndicatorView\Default.png
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._Default.png
ETActivityIndicatorView\example\ETActivityIndicatorView\Default@2x.png
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._Default@2x.png
ETActivityIndicatorView\example\ETActivityIndicatorView\en.lproj
.......................\.......\.......................\........\InfoPlist.strings
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\en.lproj
........\.......................\.......\.......................\........\._InfoPlist.strings
........\.......................\.......\.......................\._en.lproj
ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView
.......................\.......\.......................\.......................\Circle.h
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView
........\.......................\.......\.......................\.......................\._Circle.h
ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView\Circle.m
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView\._Circle.m
ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView\ETActivityIndicatorView.h
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView\._ETActivityIndicatorView.h
ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView\ETActivityIndicatorView.m
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView\._ETActivityIndicatorView.m
........\.......................\.......\.......................\._ETActivityIndicatorView
ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView-Info.plist
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._ETActivityIndicatorView-Info.plist
ETActivityIndicatorView\example\ETActivityIndicatorView\ETActivityIndicatorView-Prefix.pch
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._ETActivityIndicatorView-Prefix.pch
ETActivityIndicatorView\example\ETActivityIndicatorView\main.m
__MACOSX\ETActivityIndicatorView\example\ETActivityIndicatorView\._main.m
ETActivityIndicatorView\example\ETActivityIndicatorView\ViewController.h
__MACOSX

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