I use auto layout and constraints in my custom cell, which include imageView,UILabel, and the UILabel can auto adjust the content height(I useUITableViewAutomaticDimension).      
Now i want to remove cell'simageView in demo(i setimageView nil), i can do that, but i can't change the cell's height small.What should i do, thank you very much.      
                        
You can override the UITableView function