Calculate UITableViewCell height with UIWebview in iOS - ios

Question

I am creating a table based application where need to display one UIWebView for each table cell. I have tried by keeping a NSMutableArray of height for each cell in my table, but it's not working.
here is my code :
- (void)webViewDidFinishLoad:(UIWebView *)aWebView
{
aWebView.scrollView.scrollEnabled = NO;
CGRect frame = aWebView.frame;
frame.size.height = 1;
aWebView.frame = frame;
CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
frame.size = fittingSize;
aWebView.frame = frame;
if (arrayRowHeights.count == 0 || arrayRowHeights == nil) {
arrayRowHeights = [[NSMutableArray alloc] init];
[arrayRowHeights addObject:[NSString stringWithFormat:#"%f", fittingSize.height]];
}
else{
[arrayRowHeights addObject:[NSString stringWithFormat:#"%f", fittingSize.height]];
if (arrayRowHeights.count == aWebView.tag) {
[tblEventInfo reloadData];
}
}
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [arrayEventInfo count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [[arrayRowHeights objectAtIndex:indexPath.section] floatValue];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
EventInfoDetail *event = [[EventInfoDetail alloc] init];
event = [arrayEventInfo objectAtIndex:indexPath.section];
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
webViewHTML = [[UIWebView alloc]init];
webViewHTML.delegate = self;
webViewHTML.tag = arrayEventInfo.count;
webViewHTML.backgroundColor = [UIColor clearColor];
webViewHTML.opaque = NO;
webViewHTML.userInteractionEnabled = NO;
if (event.d_description == (NSString *)[NSNull null]){
[webViewHTML loadHTMLString:#"" baseURL: nil];
}
else{
[webViewHTML loadHTMLString:event.d_description baseURL: nil];
}
webViewHTML.frame = CGRectMake(0, 0, cell.frame.size.width, cell.frame.size.height);
[cell.contentView addSubview:webViewHTML];
}
return cell;
}
My problem is I am not able to set the the height of the cell properly, can anyone please figure out where is my mistake on this given code. Thanks!

Answer 1

Your webViewDidFinishLoad for each cell will get called only after the tablecell is loaded i,e; So the sequence calls will be
heightForRowAtIndexPath -> cellForRowAtIndexPath -> webViewDidFinishLoad . So you will never be able to set the height before cell loads. After webView is loaded try calling
- (void)webViewDidFinishLoad:(UIWebView *)aWebView
{[tableView reloadRowsAtIndexPaths:[tableView indexPathsForVisibleRows]
withRowAnimation:UITableViewRowAnimationNone];}
which will call heightForRowAtIndexPath again and try to set it again.
But the height will increase at runtime .You should customize that event

Answer 2

Initialize your arrayRowHeights as NSMutableArray beforehand(in viewDidLoad method for instance) with the same capacity as arrayEventInfo.Change your webView delegate method to this one
- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
CGFloat height = aWebView.scrollView.contentSize.height;
if (height != [[arrayRowHeights objectAtIndex: aWebView.tag] floatValue]) {
[arrayRowHeights insertObject:[NSNumber numberWithFloat: height] atIndex: aWebView.tag];
[tblEventInfo reloadRowsAtIndexPaths:#[[NSIndexPath indexPathForItem:0 inSection:aWebView.tag]] withRowAnimation:UITableViewRowAnimationNone];
}
}
In method:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
Change line
webViewHTML.tag = arrayEventInfo.count;
with line
webViewHTML.tag = indexPath.section;