A页面 present B页面 , B页面 dismiss 后 present C页面 不出来的解决
编译器给出的提示如下:Warning:Attempttopresentonwhoseviewisnotinthewindowhierarchy!解决办法:ReleaseDiscussVC*releaseVC=[ReleaseDiscussVCnew];UINavigationController*nav=[[UINavigationControlleralloc]initWithRootViewC