ios - NSAutoresizingMaskLayoutConstraint error when UITableViewHeaderFooterView is reused -

i'm getting following error after call insertsections:withrowanimation: , endupdates. error concerns autolayout in custom uitableviewheaderfooterview when header reused dequeuereusableheaderfooterviewwithidentifier:. first time works fine no errors.

unable simultaneously satisfy constraints. ... (     "<nslayoutconstraint:0x10b77f9f0 v:|-(8)-[uiview:0x10b77d0f0]   (names: '|':wybdetailheaderview:0x10b77e620 )>",     "<nsautoresizingmasklayoutconstraint:0x10b77cac0 h=--& v=--& v:[wybdetailheaderview:0x10b77e620(0)]>",     "<nslayoutconstraint:0x10b77fa40 v:[uiview:0x10b77d0f0]-(>=4)-|   (names: '|':wybdetailheaderview:0x10b77e620 )>" ) attempt recover breaking constraint  <nslayoutconstraint:0x10b77fa40 v:[uiview:0x10b77d0f0]-(>=4)-|   (names: '|':wybdetailheaderview:0x10b77e620 )> 

there similar error horizontal constraints. problem nsautoresizingmasklayoutconstraint appears both width , height set zero. however, once animation completes header layout correct , looks fine.

i have followed advice in related question no luck: uitableviewheaderfooterview subclass auto layout , section reloading won't work together

has encountered similar before?

is there can avoid warning?

this implementation in uitableview:

- (uiview *)tableview:(uitableview *)tableview viewforheaderinsection:(nsinteger)section {     wybdetailheaderview *header = [tableview dequeuereusableheaderfooterviewwithidentifier:@"wyb"];     [header setupwithtitle:@"title" subtitle:@"subtitle"];     return header; } 

and implementation of wybdetailheaderview (it uses nib register registernib:forheaderfooterviewreuseidentifier:):

- (void)setupwithtitle:(nsstring *)title subtitle:(nsstring *)subtitle {     // set labels.     self.titlelabel.text = title.uppercasestring;     self.subtitlelabel.text = subtitle;      // clear image.     self.headerimageview.image = nil;     self.emptyimage = no;      // mark layout update.     [self setneedsupdateconstraints];     [self setneedslayout]; }  - (void)prepareforreuse {     self.prototype = no;     self.emptyimage = no; }  - (void)updateconstraints {     // see if there image.     if (self.emptyimage || self.headerimageview.image) {         self.imagewidthconstraint.constant = 20;         self.imageheightconstraint.constant = 20;         self.imagetitlespaceconstraint.constant = 8;     }     else {         self.imagewidthconstraint.constant = 0;         self.imageheightconstraint.constant = 0;         self.imagetitlespaceconstraint.constant = 0;     }      [super updateconstraints]; }  - (void)layoutsubviews {     [super layoutsubviews];     self.titlelabel.preferredmaxlayoutwidth = cgrectgetwidth(self.titlelabel.frame);     self.subtitlelabel.preferredmaxlayoutwidth = cgrectgetwidth(self.subtitlelabel.frame);     [super layoutsubviews]; } 

i had similar error , making use of estimatedheightforrowatindexpath caused it.