Create dynamic height for UITableViewCells in iOS

During my try creating a forum view with threads and posts for ios devices i figured out that there is no option to get an automatic height for table cells if the content is larger then the layout i created in the .xib file.

After not finding a proper and easy solution in several developer forum, it took me some days to figure out a way to get it done in a way that seems to work for me.
Calculating the size of the content seems to do the trick.

In my layout i have label for the username, a label for the date of the post and the message itself.
The message label is the only content, that could cause any issues, so this is the only part that needs to be calculated.

Here is the code that does it for me:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    NSObject *Thread = [_postArray objectAtIndex:indexPath.row];
    NSString *message =[Thread valueForKeyPath:@"Forum.message"];
    CGSize maximumLabelSize = CGSizeMake(296,9999);
    UIFont *font = [UIFont systemFontOfSize:17];
    CGSize expectedLabelSize = [message sizeWithFont:font constrainedToSize:maximumLabelSize lineBreakMode:NSLineBreakByWordWrapping];
    int a = expectedLabelSize.height + 55;
    return a;

– you can get systemFontSize also through a function, so it could be dynamic
– 55 is the fix height of the content above the message label

If there are other – maybe better or more comfortable – ways, please let me know. 🙂

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