Bar Button Item Fade In/Out? - xcode

Question

Is there any way to fade a bar button item, as there is no .alpha attribute to set. I'm interested in fading a button out and fading another button in to take its place on the navigation bar. Is there any way to do this?
EDIT: I am trying to fade the top right Bar Button Item
I understand fading is usually accomplished with the .alpha as I stated before.
My issue is for a Bar Button Item there is NO alpha attribute.
As seen here:
As opposed to a normal button where there is an .alpha attribute:
How can I fade a Bar Button Item?

Answer 1

Easy. You would have to create an outlet for them both then create if statements or whatever method you want to initiate the fade in/ fade out animations:
- (void) animateButton {
button1.alpha = 0;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:.5];
button1.alpha = 1;
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
[UIView commitAnimations];
}
- (void) animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:.5];
button1.alpha = 0;
[UIView commitAnimations];
}
swift
viewDidLoad {
self.button1.alpha = 1
self.button2.alpha = 0
}
When you call Animation Code:
UIView.animateWithDuration(1.0, animations: {
self.button1.alpha = 0
})
// Changing buttons based on UIControlState: You can also do this in storyboard by dragging a bar button item to your view controller and ctrl+drag to your .h file to create an outlet and then commit your animations or code based on what you want.
UIImage *backButtonImage = [[UIImage imageNamed:#"button_back"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 13, 0, 6)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];