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Question

When setting the right navigation bar button to disabled, it does not change its color to signal its disabled state to the user.

It remains "highlighted", non-greyed-out.

I have set up the button in Storyboard as follows:

self.navigationController.navigationItem.rightBarButtonItem.enabled = NO;

What do I need to do to change the button`s state visually too?

Thank you!

Answer 1

Credit to Vijay-Apple-Dev.blogspo for this answer.

self.navigationItem.leftBarButtonItem.enabled = NO;
self.navigationItem.rightBarButtonItem.enabled = NO;

This automatically seems to grey out the buttons and also disables them.

NOTE: The assumption in the question that self.navigationController.navigationItem.rightBarButtonItem.enabled = NO; works seems to be wrong, after trialling it in my code I found it had no effect.

Again thanks to Vijay noting that it might be better to use:

self.navigationItem.hidesBackButton = YES;

As Apple doesn't like disabling the back button.

Personally I am going to disable the top right button and hide the back button to stop the user from pressing them, then enable them again when I choose.

A link to the question is here

This answer is posted for completeness and so future users don't need to continue searching past this page.

Answer 2

None of the relevant answers were able to produce the result I was looking for - but I was able to solve this by setting the text attributes on my navigation buttons:

[navButton setTitleTextAttributes:@{NSForegroundColorAttributeName:enabledColor} forState:UIControlStateNormal];
[navButton setTitleTextAttributes:@{NSForegroundColorAttributeName:disabledColor} forState:UIControlStateDisabled];

Then, all I need to do is the following and the user interactability and color changes automatically:

navButton.enabled = YES; // or NO

Answer 3

尝试这样的事情：

[[self.navigationItem.rightBarButtonItems objectAtIndex:0] setEnabled:NO];

Answer 4

You can try to manually change the tint colour like this:

    self.navigationItem.rightBarButtonItem.tintColor = [UIColor grayColor];

This is untested code, but it should work. Also, don't forget to change it back when it's enabled again.

Answer 5

将其更新为：

self.navigationItem.leftBarButtonItem?.isEnabled = true