Question

I have this code:

UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:textField action:@selector(setText:)];

How do I send a piece of info with the setText action. For instance

setText:@"This is text"

Thank you.

Answer 1

Configured as an action setText: will be called with an (id)sender where sender will be your UIButton. If you were using a custom UIButton you could give it a property to hold the text you wanted to pass and then access that within your action method. Since you’re using UIBarButtonSystemItemDone you cannot.

Let me guess what you want to do: let the user enter some text and pass that back to a parent view controller when they click done.

If so, try this:

1. Give your view controller a property (and IBOutlet) for the text field.
2. Access that in setText:

So…

- (void)setText:(id)sender
{
    NSString *theText = self.textField.text;

    // now do what you wanted...
}

I hope that helps.