解决办法
self.edgesForExtendedLayout = UIRectEdgeTop;
_tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
解决办法
self.edgesForExtendedLayout = UIRectEdgeTop;
_tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;