依照个人喜好修改了部分代码。待完善。

1.delete the storyboard , i think it will more reusable.
2.modify some code about Padding ，i think it fullness not enough~ just
personal preference.
3.i am a newer developer , hope more graceful code.
In personal preference

modify some code about padding to suit me.remove the storyboard and
some entry code to simplify proect , make it more reusable.