40 手势和UI控件之间约束冲突解决

转载自: 

http://blog.csdn.net/xcysuccess3/article/details/39926693

http://www.cnblogs.com/diyigechengxu/p/5883850.html

http://www.jianshu.com/p/c01d006f9821

已经有大神比我总结了很好了,我是搬运工