ios - My custom uitableviewcell is very to scroll in iOS7 -

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i have custom uitableviewcell made nib file , contain large imageview ( use sdwebimage) , ohattributedlabel , 5-6 uilabel

the scroll normal , rather quick in ios6 in ios7 , turns out slow , lagging.

i tried remove elements in nib file , notice slow scroll when having either large imageview (sdwebimage) or ohattributedlabel

are there ways can improve scrolling performance ? in ios6 didn't expect have problem before ( use iphone5 testing)

-(void)viewdidload {  [super viewdidload];    //register nib here customitemcell  [self.tableview registernib:[uinib nibwithnibname:@"customitemcell" bundle:nil] forcellreuseidentifier:@"customitemcell"];  }  -(uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { static nsstring *cellidentifier = @"customitemcell";     customitemcell *cell = (customitemcell *)[tableview dequeuereusablecellwithidentifier:squakcellidentifier forindexpath:indexpath];  customitem *item = [itemsarray objectatindex:[indexpath row]];        nsmutableattributedstring *attrstr = [[nsmutableattributedstring alloc] initwithstring:[nsstring stringwithformat:@"%@",[item post] ]];       [attrstr setfontname:@"helvetica" size:14];  // cell.postlabel ohatrributedlabel     cell.postlabel.delegate = self;     cell.postlabel.attributedtext = attrstr;     cell.postlabel.text = [item post] ;    //configurehashtage ask ohattributedlabel make hashtag link     [cell configurehashtaglabel];       if([item hasimageurlstring]){           [cell.postimageview sethidden:no];         cgfloat yposition = cell.thumbnailview.frame.origin.y + cell.thumbnailview.frame.size.height+15;    nsdictionary *attributes = @{nsfontattributename: [uifont fontwithname:@"helvetica" size:14]};         cgrect framesize = [item.post boundingrectwithsize:cgsizemake(220, 2000) options:nsstringdrawinguseslinefragmentorigin attributes:attributes context:nil];            yposition = max(yposition,cell.postlabel.frame.origin.y+framesize.size.height+20);         [cell.postimageview setimagewithurl:[nsurl urlwithstring:[item postimageurlstring]] placeholderimage:[uiimage imagenamed:@"image_placeholder.png"] ];        cgrect imageframe = cgrectmake(10 ,yposition, 300, 200);         [cell.postimageview setframe:imageframe];         [cell.postimageview setclipstobounds:yes];         cell.postimageview.userinteractionenabled = yes;          [cell.postimageview setupimageviewerwithimageurl:[nsurl urlwithstring:[item postimageurlstring]]];       }     else {         [cell.postimageview sethidden:yes];     }         return cell;    }

i had huge performance impact on table scrolling performance on ios 7, , tracked down line of code:

[uisearchbar appearance].backgroundcolor = [uicolor whitecolor];

it turns out, line of code doesn't anyway - , put in mistake when customising of ios 7 app.

it must bug in sdk, removing line , re-running app, scroll performance resolved - scroll views in app. must have been doing on main run loop stealing cpu cycles... don't know if makes sense.

anyway... check , see if have appearance code, , comment out temporarily find killing performance.


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