Handle button click inside UITableViewCell

Question

I can't seem to handle a button click properly inside a custom UITableViewCell. It's a cell that contains a label and a button. I have the following code:

var cell = tableView.DequeueReusableCell (cellKey) as ApptHistoryCell;
if (cell == null)
{
    cell = _container.Cell;
    cell.SelectionStyle = UITableViewCellSelectionStyle.None;
}

if (InfoClicked != null)
{
    cell.ActionButton.TouchUpInside += InfoClicked;
}

InfoClicked is an event handler passed on in loop on cell creation. When the cell is re-used, this causes a null reference exception, because (I think) TouchUpInside is trying to call 2 handlers. Old one and the new one, which causes a crash. If I put the event handler inside cell == null if block, then the wrong action is shown.

How can I handle the click properly?

Thanks!

JP Hribovsek · Accepted Answer · 2012-11-26T07:54:04.243

5

The way I handle buttons inside custom cells:

I define an IBAction that I connect to a UIButton event inside the custom cell
I define a delegate and a delegate method for the cell to handle the button action
The IBAction calls that delegate method
When defining your cells in cellAtRow... I set the tableViewController to be the delegate. cell.delegate=self;
I do whatever action I would like to do inside that delegate method in the tableViewController

Makes sense?

edited Nov 26 '12 at 07:54

answered Nov 26 '12 at 07:43

JP Hribovsek

6,707
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1

Is there a way to get the indexPath of that cell through this delegate method as well? – Isuru Feb 07 '15 at 17:03
That's a great question Isuru, worthy of a separate post. That's what's stumping me right now. – rtcarlson Mar 12 '15 at 17:46

score 0 · Answer 2 · answered Nov 26 '12 at 07:41

0

you should create your cell from a xib file, which already connects the buttons to the owner's targets (the view controller).

answered Nov 26 '12 at 07:41

Sagi Mann

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That is what I'm doing. Now I want to handle the click action on the cell – Greg R Nov 26 '12 at 07:46

score -3 · Answer 3 · edited Jan 19 '15 at 18:13

In your custom cell just locate your button at IB and make connection with the property.

Now, in the controller at cellForRowAtIndexPath, what you need, just tag that button, say:

(MyCustomCell*)cell.myButton = indexPath.row;

Now, after that just set the click event like that:-

[(MyCustomCell*)cell.myButton addTarget:self action:@selector(NeedFunctionToCall:) forControlEvents:UIControlEventTouchUpInside];

Now, at same view controller, implement that required method, like that:

-(void)NeedFunctionToCall:(id)sender
{
 NSLog("Got the event :-> %d, from the cell/button",[sender tag]);
}

Handle button click inside UITableViewCell

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