ios - UITableView dynamic height cannot satisfy constraints -

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i'm trying use autolayout dynamically determine height of table cells using tutorial http://www.raywenderlich.com/73602/dynamic-table-view-cell-height-auto-layout

the problem is, i'm getting these weird automatic constraints set dimensions simulated metrics of custom cell. have done lot of autolayout, , thought simulated metrics weren't supposed affect actual app @ runtime. did change in new sdk?

anyway, here method i've been messing with...

    - (cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath {             static jmsocialfeedtableviewcell *sizingcell = nil;             static dispatch_once_t oncetoken;             dispatch_once(&oncetoken, ^{                     sizingcell = [self.tableview dequeuereusablecellwithidentifier:@"cell"];             });            [self configurecell:sizingcell forindexpath:indexpath];             //[sizingcell.contentview addconstraint:[nslayoutconstraint constraintwithitem:sizingcell.contentview attribute:nslayoutattributewidth relatedby:nslayoutrelationequal toitem:nil attribute:nslayoutattributewidth multiplier:0 constant:self.tableview.frame.size.width]];             [sizingcell setneedslayout];            [sizingcell layoutifneeded];             //cgsize size = [sizingcell.contentview sizethatfits:cgsizemake(self.tableview.frame.size.width, cgfloat_max)];            cgsize size = [sizingcell.contentview systemlayoutsizefittingsize:uilayoutfittingcompressedsize];            return size.height + 1.0f; // add 1.0f cell separator height     }

the commented out lines different things trying. simulated metrics 300 x 389. sizethatfits method returns size though table view 320 wide. systemlayoutsizefittingsize returns 400 x 489 whatever reason. in these cases, easy see why i'm getting unsatisfiable constraints, height should 409 (+1.0f seperator maybe. i've been trying , without too).

i'm not setting other constraints in code, if try adding 1 have commented in code above i'm getting weird constraint...

    "<nslayoutconstraint:0x1701ebf0 'uiview-encapsulated-layout-width' h:[uitableviewcellcontentview:0x1705a310(300)]>"

i don't know why number 300 keeps showing up. thought simulated metrics supposed gone once view laid out.

sorry if question isn't 100% clear. guess i'm confused on few points. i'm trying autolayout determine proper height of cell given cell's width should equal width of table view (which 320 on device i'm testing on).


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