Is there a way of doing an action locally on a UIButtton? - ios

Question

I am setting up a table with an I have this code:
UIButton *done = [[UIButton alloc]initWithFrame:CGRectMake(20, 25, 40, 40)];
[done setImage:[UIImage imageNamed:#"unchecked.png"] forState:UIControlStateNormal];
[done addTarget:self action:#selector(done:) forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:done];
return cell;
This doesn't work beacuse this button is only declared in this scope and I want to simply change its image on this click

Answer 1

Change the image in the done: method.
- (void)done:(id)sender
{
UIButton *button = (UIButton *)sender;
[button setImage:[UIImage imageNamed:#"yourImage.png"]
forState:UIControlStateNormal];
}

Answer 2

What does you done method look like?
I think that if you add a sender argument to the method, you can access the button.
- (void)done:(id)sender
{
UIButton *button = (UIButton*)sender;
[button doStuff];
}

Answer 3

You have to declare an ivar or a private/public property. So you can change its image from everywhere, for example:
#interface ViewController ()
#property UIButton *done;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.done = [[UIButton alloc]initWithFrame:CGRectMake(20, 25, 40, 40)];
[self.done setImage:[UIImage imageNamed:#"unchecked.png"] forState:UIControlStateNormal];
[self.done addTarget:self action:#selector(done:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.done];
}
- (void)done:(UIButton *)sender
{
//Do something.. like change image
[self.done setImage:[UIImage imageNamed:#"checked.png"] forState:UIControlStateNormal];
}
#end
Or you declare the sender as the UIButton, like this:
- (void)done:(id)sender
{
UIButton *done = (UIButton *)sender;
//Do something with the button
}