【iOS】View Controllers布局相关参数:edgesForExtendedLayout和automaticallyAdjustsScrollViewInsets
记录参考:https://www.jianshu.com/p/ca3c5a94c32bedgesForExtendedLayouttypedefenum:NSUInteger{UIRectEdgeNone=0,UIRectEdgeTop=1<<0,UIRectEdgeLeft=1<<1,UIRectEdgeBottom=1<<2,UIRectEdgeRight=1<<3,UIRectEdgeAll