springAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(beforeX, beforeY)]; // 始点 springAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(afterX, afterY)]; // 終点 springAnimation.removedOnCompletion = NO; springAnimation.fillMode = kCAFillModeForwards; springAnimation.delegate = self; [self.hogeView.layer addAnimation:springAnimation forKey:@"move-layer"]; この場合、 fromValueがばねを伸ばした状