There are only visible cards in memory, after you drag and removed the top one, it will be reused as the last one.
内存中只会生成可见的卡片，顶部的卡片被划走之后，会作为最后一张卡片循环利用。

pod surpported: pod 'iCards'
支持pod : pod 'iCards'

Here is an example:
用法示例：