Here's my Swift solution. In your subclass of UIViewController, override the navigationShouldPopOnBackButton method.
extension UIViewController {
func navigationShouldPopOnBackButton() -> Bool {
return true
}
}
extension UINavigationController {
func navigationBar(navigationBar: UINavigationBar, shouldPopItem item: UINavigationItem) -> Bool {
if let vc = self.topViewController {
if vc.navigationShouldPopOnBackButton() {
self.popViewControllerAnimated(true)
} else {
for it in navigationBar.subviews {
let view = it as! UIView
if view.alpha < 1.0 {
[UIView .animateWithDuration(0.25, animations: { () -> Void in
view.alpha = 1.0
})]
}
}
return false
}
}
return true
}
}