好久没有更新博客喽，今天来说一个瀑布流布局。
瀑布流在很多网站已有很多，现在只说一下简单的实现原理吧，
1、计算一行可以排放几个元素
2、建立一个数组用于存放第一行的每个元素的高度。
3、得到数组中的最少值和索引
4、设置第二行的第一个元素的TOP值为数组中的最小值，同时设置它的LEFT值为第一行索引元素的LEFT值
5、将数组为索引值的元素设置为(第四条中的top值加它的高度)
效果如下图：
代码如下：
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