Dynamic UITableViewCell content does not expand ce

问题:

I have a storyboard with several different types of prototype cells with UILabels containing dynamic data. In my storyboard, the cell looks like this:

The UILabel's Lines property is set to zero to allow multiple lines of text. It is pinned to the top, left, right of the content view and to the nearest neighbor on the bottom (the blue line). The blue line is pinned to the left and right of the content view and to the UILabel at the top, and the UITextView at the bottom.The UITextView is pinned to the content view on the bottom, left and right, and to the blue line at the top.

When I run the app I get the following:

So the UILabel is forcing everything else down, as it should be, but the cell's height does not change as I want it to and thus the text view is being clipped off by the cell's fixed height. It was my assumption that if everything were pinned at the top and bottom, then the content view would be forced to expand. What am I missing here? Thanks!

回答1:

It seems you have set your constraints correctly, just make sure that delegates are as below:

-(CGFloat)tableView:(UITableView *)tableView
estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 44;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
   return UITableViewAutomaticDimension;
}

(If your constraints are set correctly from top to bottom)And that's it, you dont have to do anything else, auto layout will do its work smartly.

回答2:

In addition to Auto-Layout constraint
try
cell.contentView.LayoutIfNeeded statement in cellForRowIndexPath just before returning cell and HeightForRowAtIndexPath method

回答3:

If you're sure all your vertical constraints are set and correct top to bottom, try setting tableView.rowHeight = UITableViewAutomaticDimension explicitly.