ios - UITableViewCell with UIWebview that adjusts height to content size -
so pulling html string down api , trying load uiwebview in uitableviewcell , content scrolls in cell. need have webview's height adjust size of content , adjust cell accordingly. found post here in swift: uitableviewcell uiwebview dynamic height , tried doing same thing having trouble because using nsmutablearray store nsnumber float , trying load in cellforrowatindexpath , heightforrowatindexpath both execute before webview delegate method gets called index out of bounds error.
so far have this:
@interface fgcthreaddetailtableviewcontroller () @property (copy, nonatomic) nsarray<fgcthreadmodel*>* threads; @property (copy, nonatomic) nsmutablearray* contentheights; @end @implementation fgcthreaddetailtableviewcontroller - (void)viewdidload { [super viewdidload]; [self.tableview registerclass:[fgcthreaddetailcell class] forcellreuseidentifier:@"threaddetailcell"]; self.tableview.estimatedrowheight = 100; self.tableview.rowheight = uitableviewautomaticdimension; [svprogresshud show]; [[fgcthread postsbythreadid:_threadid] subscribenext:^(id x) { _threads = x; [svprogresshud dismiss]; [self.tableview reloaddata]; }]; _contentheights = [[nsmutablearray alloc] init]; } #pragma mark - table view data source - (nsinteger)numberofsectionsintableview:(uitableview *)tableview { return 1; } - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section { return _threads.count; } - (uitableviewcell*)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { fgcthreaddetailcell* cell = [tableview dequeuereusablecellwithidentifier:@"threaddetailcell" forindexpath:indexpath]; fgcthreadmodel* thread = _threads[indexpath.row]; cell.webview.delegate = self; cgfloat htmlheight; htmlheight = [_contentheights[indexpath.row] floatvalue]; cell.webview.tag = indexpath.row; [cell.webview loadhtmlstring:thread.postbodyhtmlstring baseurl:nil]; cell.webview.frame = cgrectmake(0, 0, cell.frame.size.width, htmlheight); return cell; } - (cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath { return [_contentheights[indexpath.row] floatvalue]; } - (void)webviewdidfinishload:(uiwebview *)webview { if (_contentheights[webview.tag]) { return; } _contentheights[webview.tag] = [nsnumber numberwithfloat:[[webview stringbyevaluatingjavascriptfromstring:@"document.body.offsetheight;"] floatvalue]]; [self.tableview reloaddata]; } @end thanks in advance!
the auto layout approach might tricky. easier approach set frame of corresponding cell in webviewdidfinishload. can use cellforrowatindexpath on table view displayed cell (it won't try cell uitableviewdatasource if it's displayed because it'll cached).
- (void)webviewdidfinishload:(uiwebview *)webview { if (_contentheights[webview.tag]) { return; } float height = [nsnumber numberwithfloat:[[webview stringbyevaluatingjavascriptfromstring:@"document.body.offsetheight;"] floatvalue]]; nsindexpath* indexofcell = [nsindexpath indexpathforrow:webview.tag insection:0]; uitableviewcell* cell = [self.tableview cellforrowatindexpath:indexofcell]; cell.frame = cgrectmake(0, 0, cell.frame.size.width, height); } 