objective c - Calculating dynamically the height of a custom UITableViewCell -

i building application without ib , writing scratch. have custom uitableviewcell , when try calculate height, behaves there no subviews. find lot of discussion dynamically setting height, nothing how calculate it, based on subviews , how , set constraints. did setting constraints first component - uiimageview , add them contenview of cell. 0.

i appreciate input on or @ least direction!

heightforrowatindexpath:

-(cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath{     uitableviewcell* cell = [[uitableviewcell alloc]init];     cell.imageview.image = [uiimage imagenamed:@"avatar"];      cell.imageview.translatesautoresizingmaskintoconstraints=no;      nsarray *constraints = [nslayoutconstraint constraintswithvisualformat:@"h:|-30-[image]" options:0 metrics:nil views:@{ @"image": cell.imageview }];      [cell.contentview addconstraints:constraints];      nsarray *constraints2 = [nslayoutconstraint constraintswithvisualformat:@"v:|-20-[image]" options:0 metrics:nil views:@{ @"image": cell.imageview}];      [cell.contentview addconstraints:constraints2];      [ nslayoutconstraint constraintwithitem:cell.imageview attribute: nslayoutattributewidth                                   relatedby:nslayoutrelationequal toitem:cell.imageview attribute:nslayoutattributeheight multiplier:1.0 constant:0.0f];       cgfloat height = [cell.contentview systemlayoutsizefittingsize:uilayoutfittingcompressedsize].height;      nslog(@"%f",height);      return height;  } 

my solution kind of problem uitableviewautomaticdimension. return in heightforrowatindexpath method. have set tableview.estimatedrowheight value close get.

for instance, if have 5 cells height [100,200,250,270,300] can set estimatedrowheight 220 (or similar).

you can take @ first answer @ using auto layout in uitableview dynamic cell layouts & variable row heights well.