How to send an object as argument when a UIButton is tapped?

Question

I have the following code inside my UIViewController -

[flipButton addTarget:self.navigationController.delegate action:@selector(changeModeAction:) forControlEvents:UIControlEventTouchUpInside];

As you can see, it calls a method inside it's navigation controller delegate. How do I correctly pass along an object to this method?

Answer 1

You can use the layer property. Add the object you want to pass as the value in the layer dictionary.

[[btn layer] setValue:yourObj forKey:@"yourKey"];

This yourObj is accessible from the button action function:

-(void)btnClicked:(id)sender
{
    yourObj = [[sender layer] valueForKey:@"yourKey"];
}

With this method you can pass multiple values to the button function just by adding new objects in the dictionary with different keys.