iOS 'Invalid section header height (nan) provided by table delegate. Value must be at least 0.0,...
问题:'Invalidsectionheaderheight(nan)providedbytabledelegate.Valuemustbeatleast0.0,orUITableViewAutomaticDimension.'原因:出现这个bug崩溃,导致产生的原因:1.heightForRowAtIndexPath的行高有设置了负数2.heightForHeaderInSection头部高度设