Hiding UINavigationItem's bar button

Question

I have added a BarButton item to the left of the nav.bar through Interface Builder and in the code I want this only to show in my table view\'s edi

Answer 1

func showOrHideButton() {
        isEnabled ? showButton() : hideButton()
    }

 func showButton() {
        navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: #selector(action))
    }

    func hideButton() {
        navigationItem.leftBarButtonItem = nil
    }

Answer 2

I have a easy function to make this. I have a navigation like this. It comes form Interface Builder, it has a background image.

@IBOutlet weak var memberBtn: UIBarButtonItem!

you can hide/show it by:

func hideMemberBtn() {
    memberBtn.isEnabled = false
    memberBtn.tintColor = UIColor.clear
}
func showMemberBtn() {
    memberBtn.isEnabled = true
    memberBtn.tintColor = UIColor.white
}

It's easy but it work for me. You can change tintColor as you needed. Hope for help :]

Answer 3

There's nothing in the documentation to suggest bar items have a hidden property.

Why not set

self.navigationItem.leftBarButtonItem = nil; 

when the user isn't editing, then set

self.navigationItem.leftBarButtonItem = whateverBarButtonItem; 

when the user is editing? This requires either re-creating the button each time or storing it for the duration of the view's lifecycle. Neither is terribly painful, but no, not nearly as easy as a .hidden property.

Answer 4

This solution work for me

UIView *myView = [[UIView alloc] initWithFrame: CGRectMake(0, 0, 300, 30)];
UIBarButtonItem *btnL = [[UIBarButtonItem alloc]initWithCustomView:myView];
self.navigationItem.leftBarButtonItem = btnL;

Answer 5

To hide/disable

[self.navigationItem.leftBarButtonItem setEnabled:FALSE];

To show/enable

[self.navigationItem.leftBarButtonItem setEnabled:TRUE];