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卢克
2012-10-07 01:35:27 +08:00
parent 96246d898b
commit d4574173b1
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_posts/2012/2012-09-26-animation-in-ios.md
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@@ -136,7 +136,12 @@ Timing Function对应的类是CAMediaTimingFunction,它提供了两种获得时
- (id)initWithControlPoints:(float)c1x :(float)c1y :(float)c2x :(float)c2y;
{% endhighlight %}
五种预定义的时间函数名字的常量变量分别为 kCAMediaTimingFunctionLinear,kCAMediaTimingFunctionEaseIn,kCAMediaTimingFunctionEaseOut,kCAMediaTimingFunctionEaseInEaseOut,kCAMediaTimingFunctionDefault.
五种预定义的时间函数名字的常量变量分别为
kCAMediaTimingFunctionLinear,
kCAMediaTimingFunctionEaseIn,
kCAMediaTimingFunctionEaseOut,
kCAMediaTimingFunctionEaseInEaseOut,
kCAMediaTimingFunctionDefault.
![](http://ww1.sinaimg.cn/large/65cc0af7gw1dxlv7mhtj3j.jpg)
自定义的Timing Function的函数图像就是一条三次贝塞尔曲线(Cubic Bezier Curve),贝塞尔曲线的优点就是光滑，用在这里就使得变化显得光滑。一条三次贝塞尔曲线可以由起点终点以及两个控制点决定。其中kCAMediaTimingFunctionDefault对应的函数曲线其实就是通过[(0.0,0.0), (0.25,0.1), (0.25,0.1), (1.0,1.0)]这四个点决定的三次贝塞尔曲线,头尾为起点和终点,中间的两个点是控制点.