How to avoid collision between UITextField and Keyboard using auto layout?

Question

1.I don't like to use any third party framework to do it,only constraint is there any possibility ?

Ok what i was tried :)

use the constraints IBOutlet i need to update it..

-(void)keyboardDidShow:(NSNotification*)aNotification{
    NSDictionary* info = [aNotification userInfo];

    double animationduration =[info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardEndFrame =[info[UIKeyboardFrameEndUserInfoKey] CGRectValue];

    NSLog(@"this is user info notification keyboard did show==%@",info);
}

guide me friends to achieve this :)

update bottom constraint of the view in keyboardDidShow: method — techloverr, Mar 03 '16 at 09:43
this might be helpful http://stackoverflow.com/questions/31356293/uitableview-and-uiview-with-keyboardwillshow/31356527#31356527 — Bhavin Bhadani, Mar 03 '16 at 09:48

iAnurag · Accepted Answer · 2016-03-03T09:48:48.720

Follow these steps:

Whenever keyboard appears just change the constant of outlet of constraint as per your need.
Then update the constraint by calling [self updateConstraintIfNeeded]
Then update layout of view by calling [self layoutIfNeeded]
Whenever keyboard comes down change your constant back to the original one
follow 3 & 4 again

TIP:
calling layout update call in UIView animation block will help you with smooth transition.

If you want to get keyboard size:

- (void)keyboardWillShow:(NSNotification*)notification {
   NSDictionary *info = [notification userInfo];
   CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
   CGFloat deltaHeight = kbSize.height - _currentKeyboardHeight; 
   // Write code to adjust views accordingly using deltaHeight
   _currentKeyboardHeight = kbSize.height;

}

Thats all.

can you tell me to get the keyboard size ? – Kishore Kumar Mar 03 '16 at 09:48 — Kishore Kumar, Mar 03 '16 at 09:48

torcelly · Answer 2 · 2016-03-03T10:02:34.700

You have to change the constant property in your NSLayoutConstraint. Then you have to refresh the layout.

If your IBOutlet is:

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

and the initial constant value in that NSLayoutConstraint is bottomInitialValue

The code should be:

- (void) keyboardDidShow:(NSNotification*) aNotification
{
    NSDictionary* info = [aNotification userInfo];

    double animationduration =[info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardEndFrame =[info[UIKeyboardFrameEndUserInfoKey] CGRectValue];

    bottomConstraint.constant = keyboardEndFrame.size.height + bottomInitialValue;
    [self.view layoutIfNeeded];
}

When the keyboard dissapear, you have to set the constant property to initial value:

bottomConstraint.constant = bottomInitialValue;
[self.view layoutIfNeeded];

Shrikant Tanwade · Answer 3 · 2016-03-03T10:25:48.000

Get imageView Top constraints IBOutlet

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

Up

- (void)keyboardWillShow:(NSNotification*)notification
 {
    NSDictionary *info = [notification userInfo];
    CGSize kbHeight = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    constraintImageViewTop.constant = constraintImageViewTop.constant - kbSize.height;
 }

Down

- (void)keyboardWillHide:(NSNotification *)notification
 {
    NSDictionary *info = [notification userInfo];
    CGSize kbHeight = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    constraintImageViewTop.constant = constraintImageViewTop.constant + kbSize.height;
 }

Make PhoneNumber(textfield) bottom constraints priority low

How to avoid collision between UITextField and Keyboard using auto layout?

3 Answers3