实现马赛克（或者叫瀑布流）界面布局。可以自动根据图片的长宽大小来进行布局。很实用-Achieve mosaic (or called the waterfall stream) interface layout. Automatically according to the size of the length and width of the picture layout. Very practical

自定义的马赛克时间风格，IOS编程学习源码，很好的参考资料。-Mosaic time style custom, learning IOS programming source code, a good reference.