uitableview - Dynamic Cell Height autolayout IOS -


i have been following tutorial implement dynamic cell height. dynamic-table-view-cell-height works in ios 7 me , not in ios 8. work in ios 8 on ipad i'm little stumped why doesn't work on iphone. whilst have followed code pretty there couple of differences between tutorial , way have implemented , don't know enough autolayout , tables i'm not sure if causing problem.

firstly on tutorial tableview has trailing , leading edges equal 0 superview. in implementation have created proportional constraints scale tableview within multiple different layouts. explain further:

here picture of tableview using proportional constraints across multiple different devices. enter image description here

to achieve implemented following constraints: enter image description here

enter image description here

enter image description here

enter image description here

is possible cell height cannot calculated autolayout because tableview has dynamic height?

the second difference can see between implementation , tutorial data source. taking data call slq3lite database whereas tutorial taking data xml feed. confident data populating cells because when @ implementation on ipad can see data so: enter image description here

but on iphone appears: table visible no cells have been written table. enter image description here

when use debugger can see records being retrieved database, not being written table.

here code long (sorry)

    #import "favouritedviewcontroller.h" #import "dbmanager.h" #import "favouritedcell.h"  @interface favouritedviewcontroller () @property (strong, nonatomic) iboutlet uitableview *tableview; @property (strong, nonatomic) nsarray *favourites; @property (nonatomic, strong) dbmanager *dbmanager; typedef void (^completionblock)();  -(void)loaddata; -(void)reloaddatawithcompletions:(completionblock)completionblock;  @end  @implementation favouritedviewcontroller  - (void)viewdidload {     [super viewdidload];     // additional setup after loading view.      self.dbmanager = [[dbmanager alloc] initwithdatabasefilename:@"tomhaisdb.sql"];      self.tableview.delegate = self;     self.tableview.datasource = self;      [self loaddata];  }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  -(void)loaddata {     nsstring *query = @"select * favourites";      if (self.favourites != nil) {         self.favourites = nil;     }      self.favourites = [[nsarray alloc] initwitharray:[self.dbmanager loaddatafromdb:query]];     /* [self reloaddatawithcompletions:^{          self.tableview.backgroundcolor = [uicolor colorwithred:28.0f/255.0f green:30.0f/255.0f blue:35.0f/255.0f alpha:1];     }];*/     [self reloadtableviewcontent]; }    /*-(nsinteger)numberofsectionsintableview:(uitableview *)tableview{     return 1; }*/  -(nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section{     return self.favourites.count; }   -(uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath{     return [self basiccellatindexpath:indexpath]; }  - (void)reloadtableviewcontent {     dispatch_async(dispatch_get_main_queue(), ^{         [self.tableview reloaddata];         [self.tableview scrollrecttovisible:cgrectmake(0, 0, 1, 1) animated:no];     }); }  -(favouritedcell *)basiccellatindexpath:(nsindexpath *)indexpath {     favouritedcell *cell = [self.tableview dequeuereusablecellwithidentifier:@"favouritecell" forindexpath:indexpath];     [self configurebasiccell:cell atindexpath:indexpath];     return cell; }  -(void)configurebasiccell:(favouritedcell *)cell atindexpath:(nsindexpath *)indexpath{     nsinteger indexoftomhaistext = [self.dbmanager.arrcolumnnames indexofobject:@"tomhaistext"];     nsstring *tomhaistext = [[self.favourites objectatindex:indexpath.row] objectatindex:indexoftomhaistext];     [self settomhaisforcell:cell item:tomhaistext];     [self setanswerforcell:cell item:tomhaistext]; // change later }  -(void)settomhaisforcell:(favouritedcell *)cell item:(nsstring *)item{     [cell.favouritetext settext:item]; }  -(void)setanswerforcell:(favouritedcell *)cell item:(nsstring *)item{     [cell.answer settext:item]; }  -(cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath{     return [self heightforfavouritecellatindexpath:indexpath]; }  -(cgfloat)heightforfavouritecellatindexpath:(nsindexpath *)indexpath{     static favouritedcell *sizingcell = nil;     static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{         sizingcell = [self.tableview dequeuereusablecellwithidentifier:@"favouritecell"];     });      [self configurebasiccell:sizingcell atindexpath:indexpath];     return [self calculateheightforconfiguredsizingcell:sizingcell]; }  -(cgfloat)calculateheightforconfiguredsizingcell:(uitableviewcell *)sizingcell{     sizingcell.bounds = cgrectmake(0.0f, 0.0f, cgrectgetwidth(self.tableview.frame), cgrectgetheight(sizingcell.bounds));     [sizingcell setneedslayout];     [sizingcell layoutifneeded];      cgsize size = [sizingcell.contentview systemlayoutsizefittingsize:uilayoutfittingcompressedsize];     return size.height + 1.0f; }  -(cgfloat)tableview:(uitableview *)tableview estimatedheightforrowatindexpath:(nsindexpath *)indexpath{     return 155.0f; }

edit 1

enter image description here enter image description here enter image description here enter image description here enter image description here enter image description here

here picture of running on ios 7 (which working) enter image description here

and log output

2015-06-01 18:43:40.855 facts[62233:607] number of rows: 2 2015-06-01 18:43:43.996 facts[62233:607] bounds before layout {{0, 0}, {256, 82}} 2015-06-01 18:43:55.068 facts[62233:607] content view before layout {{0, 0}, {256, 82}} 2015-06-01 18:44:09.409 facts[62233:607] bounds after layout {{0, 0}, {256, 82}} 2015-06-01 18:44:12.843 facts[62233:607] content view before layout {{0, 0}, {256, 82}} 2015-06-01 18:44:21.462 facts[62233:607] bounds before layout {{0, 0}, {256, 82}} 2015-06-01 18:44:23.884 facts[62233:607] content view before layout {{0, 0}, {256, 82}} 2015-06-01 18:44:30.536 facts[62233:607] bounds after layout {{0, 0}, {256, 82}} 2015-06-01 18:44:32.278 facts[62233:607] content view before layout {{0, 0}, {256, 82}}

from piece of code: 

    -(cgfloat)calculateheightforconfiguredsizingcell:(uitableviewcell *)sizingcell{     sizingcell.bounds = cgrectmake(0.0f, 0.0f, cgrectgetwidth(self.tableview.frame), cgrectgetheight(sizingcell.bounds));     nslog(@"bounds before layout %@", nsstringfromcgrect(sizingcell.bounds));      nslog(@"content view before layout %@", nsstringfromcgrect(sizingcell.contentview.bounds));     [sizingcell setneedslayout];     [sizingcell layoutifneeded];      cgsize size = [sizingcell.contentview systemlayoutsizefittingsize:uilayoutfittingcompressedsize];     nslog(@"bounds after layout %@", nsstringfromcgrect(sizingcell.bounds));     nslog(@"content view before layout %@", nsstringfromcgrect(sizingcell.contentview.bounds));     return size.height + 1.0f; }

but on ios8 see: enter image description here

and output:

2015-06-01 18:47:14.688 facts[62306:81355636] bounds before layout {{0, 0}, {256, 44}} 2015-06-01 18:47:14.688 facts[62306:81355636] content view before layout {{0, 0}, {256, 44}} 2015-06-01 18:47:14.688 facts[62306:81355636] bounds after layout {{0, 0}, {256, 44}} 2015-06-01 18:47:14.688 facts[62306:81355636] content view before layout {{0, 0}, {256, 44}}

the sizingcell in ios7 reading correct bounds cell's contents in ios8 not.

you're doing much; apple can handle leading , trailing spacing you.

0 is exactly right number use, pin superview.margin, not superview. apple adjust margin recommended margin, dependent on device. (wider on 4.7", narrower on 4".)

fyi, 0 times multiplier factor 0, current constraints won't expect should.

the reason why cell height off due misplaced frame (that interface builder couldn't warn because label constraints not installed anyxany).

ios 7 still solve cell height, ios 8 requires cell height correct (solvable).


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