CABasicAnimation執行動畫完成後，創建的layer又回到的之前的位置，並且閃爍一下，需要創建的動畫添加一下兩行代碼：

                    CABasicAnimation *animation =  [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];

                    animation.removedOnCompletion = NO;

                    animation.fillMode = kCAFillModeForwards