Set UIView bottom space constraint to keyboard height

Question

I'm a big fan of autolayout, but have always implemented it in Storyboard.

I have a UIView that I want the bottom space constraint to be where the keyboard ends.

I have defined all my constraints, can someone show me how to implement this constraint in code for just the bottom space? And also how to get the value of the keyboard height depending on the specific iDevice and match that to the constraint.

Thanks

Is duplicated here. http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present — Long Pham, Aug 05 '15 at 17:54

Mahesh Agrawal · Accepted Answer · 2015-08-05T17:50:41.313

Take an outlet of the bottom constraint of the view like this

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *constraintContainerBottom;

and use this

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self setupKeyboard:YES];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self setupKeyboard:NO];
}

- (void)setupKeyboard:(BOOL)appearing
{
    if (appearing) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    }else{
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
    }
}

- (void)keyboardWillShow:(NSNotification*)notification
{
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    double duration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    int curve = [[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];
    [UIView beginAnimations:@"keyboardShown" context:nil];
    [UIView setAnimationDuration:duration];
    [UIView setAnimationCurve:curve];

    self.constraintContainerBottom.constant = keyboardSize.height;
    [self.view layoutIfNeeded];

    [UIView setAnimationDelegate:self];
    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification*)notification
{
    double duration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    int curve = [[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];
    [UIView beginAnimations:@"keyboardHidden" context:nil];
    [UIView setAnimationDuration:duration];
    [UIView setAnimationCurve:curve];

    self.constraintContainerBottom.constant = 0;
    [self.view layoutIfNeeded];

    [UIView setAnimationDelegate:self];
    [UIView commitAnimations];
}

"constraint" isn't a property of the NSLayoutConstraint IBOutlet...? — nickjf89, Aug 05 '15 at 17:47
@nickjf89 It's depend the way your handle. It's solution is good. :) I think it's work. — Long Pham, Aug 05 '15 at 17:50
Sorry if I'm being dumb...How do I set the IBOutlet for a constraint to my UIView? — nickjf89, Aug 05 '15 at 17:57
just double click on the constraint and then on the left pane a constraint will be selected. just drag that to your required class file and set a name. — Mahesh Agrawal, Aug 05 '15 at 17:59

Set UIView bottom space constraint to keyboard height

1 Answers1