Adding actions to a button programmatically on iOS - ios

Question

I am trying to add an action to buttons which I am creating programmatically:
[btn addTarget:self
action:#selector(indexAction)
forControlEvents:UIControlEventTouchUpInside];
This works fine. However, I now want to pass a variable (int k) to the indexAction method. I couldn't get this to work:
[btn addTarget:self
action:#selector([self indexAction:k])
forControlEvents:UIControlEventTouchUpInside];
I am sure I'm doing something wrong. This is the context of the above code:
-(void) initIndexButtons {
float buttonPadding = -8;
float buttonWidth = 23;
float buttonHeight = 80;
CGRect frame = CGRectMake(0,0,0,0);
for (int k=0;k<5;k++)
{
UIButton* btn = [[UIButton alloc] initWithFrame:frame];; btn.tag = k;
btn.frame = CGRectMake(0, k*(buttonPadding+buttonHeight), buttonWidth, buttonHeight);
UIImage *newImage = [UIImage imageNamed:#"index.png"];
[btn setBackgroundImage:newImage forState:UIControlStateNormal];
[btn addTarget:self
action:#selector(self indexAction:k)
forControlEvents:UIControlEventTouchUpInside];
}
}
-(void)indexAction:(int *)buttonTag
{
NSLog(#"buttonTag: %i", buttonTag);
}
EDIT:
I changed my code to:
// ...
[btn addTarget:self
action:#selector(indexAction:)
forControlEvents:UIControlEventTouchUpInside];
//[self indexAction:k];
[indexView addSubview:btn];
[indexView sendSubviewToBack:btn];
}
}
-(void)indexAction:(id)sender
{
NSInteger *tid = ((UIControl *) sender).tag;
NSLog(#"buttonTag: %i", tid);
}
But now I get the warning message that "Initialisation makes pointer from integer without a cast for the line NSInteger *tid = ((UIControl *) sender).tag;
EDIT:
This is the right line of code:
NSInteger tid = ((UIControl*)sender).tag;

Answer 1

Normally the method that a button calls takes one parameter:
(id)sender
Take a look at the question - how to pass a variable to a UIButton action

Answer 2

tag is an NSInteger not NSInteger*
change to
NSInteger tid = ((UIControl*)sender).tag;

Answer 3

The way to do it is to set:
-(void)indexAction:(id)sender
{
NSLog(#"Tag=%#"[(UIButton*)sender tag]);
}
and the call:
[btn addTarget:self
action:#selector(self indexAction:)
forControlEvents:UIControlEventTouchUpInside];
}
not really sure about my casting, haven't tested that, but I think it should work!
Best of luck.