how do i know which button was pressed?

[peptides]

i am trying to make a peptide MW calculator.

i have 20 round rect buttons. each is owned by a single Controller NSObject. Each is linked to the Controller through the same IBAction "addAA".

I want:
addAA IBAction to know which button was pressed, read the label from that button, and then lookup the label in my dictionary to do a computation.

I don't know how to do this in an efficient manner. The tutorials I have been working with typically have ONE IBAction for EACH button. This would mean 20 different IBActions each performing the same exact function. Maybe I will have all 20 IBActions link to a third function while passing the button's label?

It'd be a lot of repeated code.

Is there anyway to ask the IBAction which button was pressed that caused it to activate??

[RickMaddy]

Simple. Declare your "addAA" method like this:

- (void)addAA:(id)sender {
    UIButton *btn = (UIButton *)sender;
    // Do stuff with 'btn'
}

[peptides]

Originally Posted by RickMaddy

Simple. Declare your "addAA" method like this:

- (void)addAA:(id)sender {
    UIButton *btn = (UIButton *)sender;
    // Do stuff with 'btn'
}

Thanks this worked perfectly!

- (IBAction)addAA:(id)sender {
    UIButton *btn = (UIButton *)sender;
    NSLog(@"The button title is: '%@'", [btn titleForState:UIControlStateNormal]);
}

[neurus]

You can give each button a tag and use it in a switch case block

- (IBAction) keyTyped:(id)sender{
	int tag = [(UIButton *)sender tag];

[peptides]

interesting, thanks!

[dietrichuhl]

Originally Posted by RickMaddy

Simple. Declare your "addAA" method like this:

- (void)addAA:(id)sender {
    UIButton *btn = (UIButton *)sender;
    // Do stuff with 'btn'
}

Thanks thats exactly my question. I'm really starting to love this group.
-D