This project forked from ramborange/myphotopickerdemo
模仿iOS系统照片手势滑动多选
模仿iOS系统照片手势滑动多选
滑动选择多个图片的基本实现 还有很多问题需要优化 而且很多方法没有进行封装
对Photos库没有接触，AssertLibrary的库虽然在iOS9.0 后废弃了，但是之前对这个库的了解甚少，花了一小时写了一个照片选择器的Demo来 看看性能等方面
代码写的很杂乱，没有整理，很多需要封装的类没有封装，数据模型也没有创建，完全是看UI效果吧
为了看到更好的效果，使用模拟器运行时，需要往模拟器里多拖入几张图片，这样滑动选择照片时的范围才更加大。
值得注意的是：滑动多项选择和滑动多项反选择均已实现，有一种情况未实现，即滑动时往回滑动的撤销动作未写，如果有需要这个功能的人，可以自己 加上，估计代码也不过几十行。
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