UIButton animation ontarget self - ios

Question

I am working on a app with two UIButtons which have to change size and color when they are pressed. My code is:
UIButton *Answer1Button = [UIButton buttonWithType:UIButtonTypeCustom];
UIButton *Answer2Button = [UIButton buttonWithType:UIButtonTypeCustom];
[Answer1Button addTarget:self action:#selector(Answer1Action) forControlEvents:UIControlEventTouchUpInside];
[Answer2Button addTarget:self action:#selector(Answer2Action) forControlEvents:UIControlEventTouchUpInside];
[Answer1Button setBackgroundColor:[UIColor redColor]];
[Answer2Button setBackgroundColor:[UIColor yellowColor]];
Answer1Button.frame = CGRectMake(0, 0, 320, 45);
Answer2Button.frame = CGRectMake(0, 50, 320, 45);
And the function I created for it:
-(void)Answer1Action{
[UIButton beginAnimations:nil context:nil];
[UIButton setAnimationDuration:0.5];
self.backgroundColor = [UIColor greenColor];
self.alpha = 0.5;
[UIButton commitAnimations];
}
The problem I encounter right now, is when I press the UIButton the function is called but the self.alpha affects the entire UIView in which the button is located in.
I'm still a rookie with Objective-C so I'm thinking it is probably something simple I forgot.

Answer 1

[Answer1Button setBackgroundColor:[UIColor greenColor]];
[Answer1Button setAlpha:0.5];
//Include QuartzCore framework and import it to your viewController.h,and write the below line along with the above code to change the size and to do many animations.
Answer1Button.layer.affineTransform=CGAffineTransformScale(Answer1Button.transform, 1.2, 1.2);

Answer 2

You are setting self.alpha = 0.5;, here self is not your button. You should set your button:
Answer1Button.backgroundColor = [UIColor greenColor];
Answer1Button.alpha = 0.5;
But this is not the best practice. You can send your button to the handler method as param:
(Variable and method names should not start with capital letter in ObjC.)
[answer1Button addTarget:self action:#selector(answer1Action:) forControlEvents:UIControlEventTouchUpInside];
And use the sender button as parameter in your handler method:
-(void)answer1Action:(id)sender{
UIButton* myButton = (UIButton*)sender;
[UIButton beginAnimations:nil context:nil];
[UIButton setAnimationDuration:0.5];
myButton.backgroundColor = [UIColor greenColor];
myButton.alpha = 0.5;
[UIButton commitAnimations];
}

Answer 3

Set button alpha instead of self.alpha=0.5;
-(void)Answer1Action{
[UIButton beginAnimations:nil context:nil];
[UIButton setAnimationDuration:0.5];
self.backgroundColor = [UIColor greenColor];
Answer1Button.alpha = 0.5;
[UIButton commitAnimations];
}