如何动态计算桌子高度？

Question

I'm trying to calculate height for a UITableView dynamically. I thought I could do it doing the sum on func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell , the problem is that this method is only called for the first X cells and won't be called again for a new set until you scroll.

I'm using autolayout constraints, How can I calculate table view accuratelly?

Answer 1

You can call below method to get height of UILabel..

  - (CGFloat)heightForWidth:(float)width AndFont:(UIFont *)font ForString:(NSString *) yourTextValue
    {
        CGSize size = CGSizeZero;
        if (yourTextValue.length > 0) {
            CGRect frame = [yourTextValue boundingRectWithSize:CGSizeMake(width, 999999) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName: font } context:nil];
            size = CGSizeMake(frame.size.width, frame.size.height + 1);
        }
        return size.height;
    }

Another way to set dynamic height of a cell

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat 
{
    return UITableViewAutomaticDimension
}

Answer 2

I am not sure what you are trying to do but appending to your comment you can disable scroll view with:

self.tableView.scrollEnabled = true 

And you can get the hight of all the cells with:

self.tableView.contentSize.height