iOS Tableview在scrollview的高度

Question

I have a UITableView nested within a UIScrollView and am finding it hard to calculate the height of either.

The content of both is dynamic so I'd like the tableview to expand to fit the content of it, and in turn the scrollview to expand to fit the content of the tableview.

I have this for the scrollview:

CGFloat scrollViewHeight = 0.0f;
for (UIView* view in contentView.subviews)
    {
        scrollViewHeight += view.frame.size.height;
    }

But the resultant height is too long, too much scrolling.

The tableview I'm finding harder to get to dynamically resize, if I leave it without a defined size it is too small. So I added this:

self.tableView.contentSize = CGSizeMake(320.0f, [self.tableView contentSize].height);

And that's too big.

I think the size of the tableview is dictated by the number and height of the rows within it but can't find a clear answer here or on the net.

Any ideas?

Answer 1

Your UITableViewDelegate should implement:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

This will set the correct size for your cell.

Answer 2

I use the following code to set the height of UIScrollView :

for (UIView* view in scrollview_.subviews)
{
    if (!view.hidden)
    {
        CGFloat y = view.frame.origin.y;
        CGFloat h = view.frame.size.height;
        if (y + h > scrollViewHeight)
        {
            scrollViewHeight = h + y;
        }
    }
}

[scrollview_ setContentSize:(CGSizeMake(320, scrollViewHeight))];

To get the height of UITableView , maybe you can calculate like rowheight*rowcount