iOS >> Why isn't it Possible to Set UIControls Properties Directly in Code When Approaching Them via "sender"?

iOS >> Why isn't it Possible to Set UIControls Properties Directly in Code
When Approaching Them via "sender"?

Let's say that I wish to approach a certain UIControl in a certain method
that it triggers - I can send the method a pointer to the UIControl using
"sender". but then, for some reason, I cannot approach sender's properties
directly and have to use the setX:forState: methods. If I approach the
properties directly, I get no error or warning; it simply does nothing...
Here's an example:
h. file...
@interface MYViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIButton *dButton; //connected to a
UIButton in IB
-(IBAction)dButtonClick:(UIButton*)sender; //connected to the same
UIButton in IB
@end
then...
m. file...
- (void)viewDidLoad
{
[super viewDidLoad];
self.dButton.titleLabel.textColor = [UIColor greenColor]; //this is
working...
}
-(IBAction)dButtonClick:(UIButton*)sender
{
sender.titleLabel.textColor = [UIColor redColor]; //this is not
working...
self.dButton.titleLabel.textColor = [UIColor redColor]; //this is also
not working...
[sender setTitleColor:[UIColor redColor]
forState:UIControlStateNormal]; //only this is working.
//But why?!?!?
}
I tried to search for some info about the way these items work, but
couldn't find anything that explains the logic behind it clear enough.
Any help would be... well... helpful...