3D-touch

http://blog.csdn.net/showhilllee/article/details/48376073

http://www.cnblogs.com/zhanglinfeng/p/5133939.html

https://github.com/itjhDev/itjh_3DTouch

peek消失问题好像有提到

http://www.cnblogs.com/Ray-liang/p/4983592.html

http://www.jianshu.com/p/3443a3b27b2d