forum

Home / DeveloperSection / Forums / How to Toggle UIBarButtonItem on KeyboardDidShow

Ask Question

How to Toggle UIBarButtonItem on KeyboardDidShow

Anonymous User217613-Oct-2014

Purpose: I am attempting to toggle the "Save" UIBarButtonItem with the "Hide Keyboard" UIBarButtonItem whenever the Keyboard appears (and then do the opposite when the "Hide Keyboard" button is clicked).

So far I have created two UIBarButtonItems and connected them both to Interface Builder.

@property (weak, nonatomic) IBOutlet UIBarButtonItem *saveButton;

@property (weak, nonatomic) IBOutlet UIBarButtonItem *hideKeyButton;

This is the code I have setup so far in my main:

- (void)keyboardDidShow:(NSNotification *)aNotification {
            // Show HideKey Button
            // Hide Save Button
        }
 
        - (void)keyboardWillHide:(NSNotification *)aNotification {
            // Show Save Button
            // Hide HideKey Button
        }

On Interface Builder, the Save button is present by default. Programmatically, how do I show the HideKey button and Hide the Save button? Thanks.

iphoneiphone mobile development 
Updated on 13-Oct-2014
Anonymous User

Anonymous User

Follow
I am a content writter !

Can you answer this question?

Answer

2 Answers

Anonymous User

Anonymous User

13-Oct-2014

Instead of using IB for this task, I would do it programmatically.

Something like this:

UIBarButtonItem *saveButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave
                                                                             target:self
                                                                             action:@selector(saveButtonPressed:)];
[self.navigationItem setRightBarButtonItem:saveButton];

And in a similar fashion to create and set the HideKey button.

Then, of course you may want to cache the UIBarButtonItems, setting lazy @properties for them.

Anonymous User

Anonymous User

13-Oct-2014

There are two parts to make this work.

First, you need to register for the notifications, what you can do is, in your viewDidLoad, add the following:

[[NSNotificationCenter defaultCenter] addObserver:self

                                         selector:@selector(keyboardDidShow:)

                                             name:UIKeyboardDidShowNotification

                                           object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self

                                         selector:@selector(keyboardWillHide:)

                                             name:UIKeyboardWillHideNotification

                                           object:nil];

Secondly, in your event handlers, simply set the buttons:

            - (void)keyboardDidShow:(NSNotification *)aNotification {

    self.navigationItem.rightBarButtonItem = hideKeyButton;

}

 

- (void)keyboardWillHide:(NSNotification *)aNotification {

    self.navigationItem.rightBarButtonItem = saveButton;

}

Liked By