native, customizable and animated circular view to show when long activity is running, for ios apps. no more images needed. just drag and drop this class, set color and style and you're ready to go with startanimation.
當ios的軟體在載入或者幹其他什麼事情需要使用者等待時，這個原生态、可定制、活動着的圓就顯示出來了。不需要圖檔，将這個類拖入你的工程，設定下顔色和樣式，執行 startanimation 後就能看到效果了。
to install <code>dfcircleactivityindicator</code>, just drag and drop the .h and .m files into your project folder. import when you need it.
要使用 dfcircleactivityindicator ，将.h .m檔案拖到你的工程目錄中，什麼時候需要就引用吧。
it must need quartzcore framework. may looks 'slow' or 'flicking' on ios simulator, but works fine on device, even on iphone 4.
這個需要用到 quartzcore 架構哦，也許在ios模拟器中看起來會卡頓，但在裝置上觀察會很流暢，即使是在iphone4上。
you're welcome to make improvements.
歡迎你對源碼做出改進。