CODEWITHSUNDEEP
iphoneobjective-cbutton
Ethan Mick
Ethan Mick

Reputation: 9567

Getting information from a button using (id)sender

So, this is pretty straight forward, but I'm not sure how to do it. To get a title from a button, you can use: 

NSString *title = [sender titleForState:UIControlStateNormal];

However, is there a way to get other information from the button such as the "Label" or "hint"?

And if there isn't, I want to be able to have different actions if a different button is pressed. So, there is an "add 1" button, an "add 2" button etc, I the same "action" to do slightly different things. This is solved by an "If" statement, but I'm not sure how to do the comparison. (Assuming the button title is "WIN"):

if (title == @"WIN")

Doesn't work, so how can I do the comparison?

(I also tried:

NSString *compare = [[NSString alloc] initWithFormat:@"WIN"];
if (title == compare)
{
do something
}

)

Upvotes: 0

Views: 1272

Answers (2)

Andrew Johnson
Andrew Johnson

Reputation: 13286

You should always compare strings using isEqualToString:

if ([title isEqualToString:@"WIN"])

Strings will compare correctly sometimes using the == operator, such as when you compare constant strings, but you shouldn't use == for string comparison in Objective-C (or Java either).

If you compare to strings using ==, then it compares their memory addresses. If you are comparing strings set to some constant, then == will be true. If they are the same string, but different memory addresses, then == will be false.

In a language like Python, == is overloaded, so you get the behavior you "expect."

Upvotes: 4

Kenny Winker
Kenny Winker

Reputation: 12107

Another option you can use in a pinch is to set the tag property of the button (in IB or in code) and then check

if (sender.tag == 69) {//one button code} else {other button code}

Upvotes: 1

Related Questions