Passing custom data in [UIButton addTarget]

Question

How do I add custom data while specifying a target in a UIButton?

id data = getSomeData(); [button addTarget:self             action:@selector(buyButtonTapped:event:)   forControlEvents:UIControlEventTouchUpInside]; 

I want the buyButtonTapped function to look like:

(void) buyButtonTapped: (UIButton *) button event: (id) event data: (id) data 

Answer 1

not possible. the action that is triggered by an UIControl can have 3 different signatures.

- (void)action - (void)action:(id)sender - (void)action:(id)sender forEvent:(UIEvent *)event 

None of them allows you to send custom data.

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Depending on what you want to do you can access the data in different ways.

For example if the button is in a UITableView you could use something like this:

- (IBAction)buttonPressed:(UIButton *)sender {     CGPoint buttonOriginInTableView = [sender convertPoint:CGPointZero toView:tableView];     NSIndexPath *indexPath = [tableView indexPathForRowAtPoint:buttonOriginInTableView];     NSData *customData = [myDataSource customDataForIndexPath:indexPath];     // do something } 

There is always a way to get the data without passing it to the button.