一个十分简单易用、可以自定义界面的日历代码效果。代码还提供了delegate的回调函数，方便自定义日历的动作，包括选择日期等等。-A very simple and easy to use, you can customize the calendar interface code effect. The code also provides a delegate callback function to facilitate the action of the custom calendar,

一个封装的系统指纹识别方法，可以更方便的回调识别结构(An encapsulated system fingerprint identification method can be a more convenient callback identification structure)