滚动时自动布局问题

Question

I have .xib which has some auto-layout like so (might need to click to zoom):

Nothing special, I have 13pt spacing with the border of the superview. This xib is then loaded in the code into a tableViewCell.

I'm also setting the height in the viewDidLoad of the table like so:

[self.tableView setEstimatedRowHeight:40];
[self.tableView setRowHeight:UITableViewAutomaticDimension];

My cellForRowAtIndexPath is:

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseId forIndexPath:indexPath];

---OR--- (Both don't make a difference)

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseId];

Now the fun begins. The auto-layout works when it wants to, and sometimes I scroll a cell out of view, bring it back and it's not the same size. See image below:

Any ideas on what I am doing wrong?

PS: Not in the screengrab here, but I do have some cells with a lot of text that look like the same height of the big cell on left.

PPS: I've tried the following with no success (based on this article http://useyourloaf.com/blog/2014/08/07/self-sizing-table-view-cells.html ):

• Added [self.tableView reloadData]; in the viewDidLoad
• I removed the explicit and preferred width on the label

Answer 1

I had the same issue, it seems if you set the text of the label exclusively in - tableView:willDisplayCell:forRowAtIndexPath: instead of - tableView:cellForRowAtIndexPath: then you will observe the behaviour of random incorrectly sized cells.

I've created a test project to demonstrate this https://github.com/sja26/iOS-TestSelfSizingCellsWithUILabel

Answer 2

One reason you get this behaviour - you use

cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

Try to use

cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

instead. This will reuse your cell with the same size as needed

And, of course check heightForRowAtIndexPath method for properly setup value