Spring animation using iOS 7

gistfile1.m

//  Set startFrame and endFrame for _contentView
CGRect endFrame = _contentView.frame;
CGRect startFrame = endFrame;
startFrame.origin.y = -startFrame.size.height;
_contentView.frame = startFrame;

void (^animationBlock)(void) = ^(void){
    _contentView.frame = endFrame;
};

/* usingSprintWithDamping: value between 0 and 1. 
 * Employ a damping ratio closer to zero to 
 * increase oscillation.
 *
 * initialSpringVelocity: a value of 1 corresponds 
 * to the total animation distance traversed in one
 * second. The higher its value, the faster its initial 
 * speed. */

[UIView animateWithDuration:1.0
                      delay:0.15
     usingSpringWithDamping:0.6
      initialSpringVelocity:7
                    options:0
                 animations:animationBlock
                 completion:nil];