圆弧/圆动画iphone [英] Arc / Circle animation in iphone

问题描述

我将如何动画在iPhone上一个圆圈，使电弧开始于0度和360度？

How would I animate a circle on the iPhone so that the arc starts at "0 degrees" and ends at "360 degrees"?

此先感谢，
周六

Advance Thanks, Sat

推荐答案

您需要读<一个href=\"http://developer.apple.com/documentation/graphicsimaging/conceptual/drawingwithquartz2d/dq%5Fpaths/dq%5Fpaths.html#//apple%5Fref/doc/uid/TP30001066-CH211-DontLinkElementID%5F10\"相对=nofollow>石英2D编程指南对弧部分。 （我假设你正在创建与可可触摸API，而不是一个Web应用程序的应用程序。）你还需要知道如何建立一个自定义动画。您必须创建一个自定义的UIView或CALayer的做图，并创建一个属性（弧度），可以用CAAnimation对象动画。或者，你可以控制使用的NSTimer而不是动画。您pretty多少得有这些类（及其他）的把握退出这个功能。

You need to read the Quartz 2D Programming Guide's section on arcs. (I am assuming you are creating an app with the Cocoa Touch API, not a web app.) You also need to know how to set up a custom animation. You will have to create a custom UIView or CALayer to do the drawing, and create a property (arc degree) that can be animated with a CAAnimation object. Alternatively, you can control the animation using an NSTimer instead. You pretty much have to have a grasp of these classes (and others) to pull this off.

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