1.使用UIView的动画实现：
+ (void)animateWithDuration:(NSTimeInterval)duration
delay:(NSTimeInterval)delay
usingSpringWithDamping:(CGFloat)dampingRatio
initialSpringVelocity:(CGFloat)velocity
options:(UIViewAnimationOptions)options
animations:(void (^)(void))animations
completion:(void (^)(BOOL finished))completion
该方法的使用可见：http://blog.csdn.net/jacob_ios/article/details/51678444
2.动画方案二：
CABasicAnimation *positionAnimation;
positionAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
positionAnimation.fromValue = [NSValue valueWithCGPoint:fromPosition];
positionAnimation.toValue = [NSValue valueWithCGPoint:toPosition];
整个实现的详细过程代码：https://github.com/xinyuly/XYMenuAnimateView
