CODEWITHSUNDEEP
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wwwuser
wwwuser

Reputation: 6362

Determine which UIButton fired event in Objective C

I have a handful of UIButtons that when pressed fire the method, (IBAction)buttonPressed:(id)sender. Right now I have a document label set for each (btnPlay, btnStop, btnPause), but I don't believe I can access this in Objective C. Is there something I can set in xcode that acts as a variable so when buttonPressed() is fired I know which button (btnPlay, btnStop, or btnPause) fired the event?

Upvotes: 2

Views: 244

Answers (4)

Wez
Wez

Reputation: 10712

You should change your IBAction to something like the below

-(IBAction)buttonPressed:(UIButton *)button {

    if([button.titleLabel.text isEqualToString:@"Start"]){
        //Do Stuff
    } 

}

In this way you can access the sender as a button directly with no issues or type casting required, you can then use the isEqualToString method to check the title of the button and run code inside the if statement.

You might also like to consider using the tag property which pretty much all Interface Objects have.

if(button.tag == 1){
    //Do Stuff
}

UIButton Tag

Switch statements are also a nice clean way of handling different events..

switch (button.tag) {
  case 1:
    // Do Something
    break;
  default:
    // Do Default Action
    break;
}

Upvotes: 2

user2211254
user2211254

Reputation: 31

you can define which method has to be called when the button pressed after @selector in this case playVideo method.

[videoButton setTitle:@"play video" forState:UIControlStateNormal];
[videoButton setBackgroundImage:nil forState:UIControlStateNormal];
[videoButton addTarget:self action:@selector(playVideo:)forControlEvents:UIControlEventTouchUpInside];

Upvotes: 1

FeifanZ
FeifanZ

Reputation: 16316

Every UIButton has a titleLabel property, which is a UILabel. Check sender.titleLabel.text and compare it against the three strings.

Alternatively, you can also assign each button a tag (generally an integer), either through the Attributes Inspector in Xcode, or using the tag property in code. Then check sender.tag in your action method.

Upvotes: 0

Tim
Tim

Reputation: 60110

That's what the sender argument is there for - you can compare it against each of your buttons in a chain of if statements to see which one sent that message.

Upvotes: 0

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