Xcode/iOS5: Move UIView up, when keyboard appears

Question

I'd like to move up my view, when the keyboard is shown. The keyboard (height: 216) should push up my view with it's height. Is this possible with a simple code?

Answer 1

Sample project Based on Apple Reference Keyboard Documentation

H File: (Don't Forget the UITextFieldDelegate)

@property (weak, nonatomic) IBOutlet UIScrollView *scrollview;

@property (weak, nonatomic) IBOutlet UIView *myView;


    //items on view
@property (weak, nonatomic) IBOutlet UISwitch *partySwitch;
@property (weak, nonatomic) IBOutlet UILabel *partyLabel;
@property (weak, nonatomic) IBOutlet UITextField *partyNameTextfield;

M file:

    //MARK: View Loading
- (void)viewDidLoad
{
    [super viewDidLoad];
        // Do any additional setup after loading the view.
}//eom

-(void)viewDidAppear:(BOOL)animated
{
    [self registerForKeyboardNotifications];
}//eom

    //MARK: textfield delegates
-(bool)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return true;
}//eom

    //MARK: - Keyboard Observers
    // Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillBeHidden:)
                                                 name:UIKeyboardWillHideNotification object:nil];

}


- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info      = [aNotification userInfo];
    CGSize kbSize           = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    CGRect bkgndRect        = myView.superview.frame;
    bkgndRect.size.height += kbSize.height;

    [myView.superview setFrame:bkgndRect];
    [scrollview setContentOffset:CGPointMake(0.0, myView.frame.origin.y-kbSize.height) animated:YES];
}//eom

    // Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets          = UIEdgeInsetsZero;
    scrollview.contentInset             = contentInsets;
    scrollview.scrollIndicatorInsets    = contentInsets;
}//eom

Answer 2

mark, apple document: Managing the keyboard - Moving Content That Is Located Under the Keyboard

Answer 3

I did this in a similar fashion to djromero except that I adjusted the frame origin of the view rather than its centre.

The view that i'm moving is a UIScrollView, and I want it to move relative to a UITextField element, so that the text field always shows. The position of this text field can vary depending on the offset of the scroll view.

So my code looks like this:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.2];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        self.scrollView.frame = CGRectMake(0,0,self.scrollView.frame.size.width,self.scrollView.frame.size.height);
        [UIView commitAnimations];
    });
    return YES;
}

- (NSInteger)getKeyBoardHeight:(NSNotification *)notification
{
    NSDictionary* keyboardInfo = [notification userInfo];
    NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
    CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
    NSInteger keyboardHeight = keyboardFrameBeginRect.size.height;
    return keyboardHeight;
}

-(void) keyboardDidShow:(NSNotification*) notification
{
    NSInteger keyboardHeight;
    keyboardHeight = [self getKeyBoardHeight:notification];
    NSInteger scrollViewFrameHeight = self.scrollView.frame.size.height;
    NSInteger textFieldRelativePosition = self.tableView.frame.origin.y - self.scrollView.contentOffset.y;
    NSInteger textFieldFrameOffset = scrollViewFrameHeight - textFieldRelativePosition;
    NSInteger movement = MAX(0,keyboardHeight-textFieldFrameOffset); // Offset from where the keyboard will appear.
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.2];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        self.scrollView.frame = CGRectMake(0,-movement,
                                           self.scrollView.frame.size.width,
                                           self.scrollView.frame.size.height);
        [UIView commitAnimations];
    });
}

The view controller is a UITextFieldDelegate and also subscribes to UIKeyboardDidShowNotification so that we are able to access the size of the keyboard.

When the keyboard shows, we calculate the relative offset of the UITextField (adjusted for scroll offset) and the keyboard and them change the origin of the UIScrollView so that it moves just enough for the UITextField still to be showing.

If the UITextField will still show even if the keyboard appears, then the origin does not change.