MVBouncyView 介绍
MVBouncyView 是 UIView 的分类，提供圆角控制效果。
UIView *view = (some view in your code) view.bounceAmplitude = 1.25f; // optional view.bounceAttenuation = 1.05f; // optional view.bounceDuration = 0.3f; // optional [view bounce:nil]; // To stop bouncing and return to original dimensions [view cancelBounce];
