Fix Keyboard Related issue in iOS 11 using objective C

Fix Keyboard Related issue in iOS 11

In iOS 11 there is some predefined function is not working like get the Keyboard Height “UIKeyboardFrameBeginUserInfoKey” sometimes it returns 0 or sometimes works so it is not compatible with iOS 11 . so for solving this, we have used the compatible function which will work in iOS 11 as well as less iOS version devices.

for this follow this steps:

1: In viewdidload

write this method:

[self registerForKeyboardNotifications];

1	[self registerForKeyboardNotifications];

2: Now define this function:

- (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)registerForKeyboardNotifications {

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];

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

}

3: Now write the two methods when the keyboard will show or hide.

- (void)keyboardWasShown:(NSNotification *)notification {

    if([addToCartMoved isEqualToString:@"0"]){
        addToCartMoved = @"1";
        CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
        CGRect newFrame = addToCartBlock.frame;
        _mainViewHeightConstraint.constant += keyboardSize.height + 50;
        
    }
}

- (void)keyboardWillBeHidden:(NSNotification *)notification {
    if([addToCartMoved isEqualToString:@"1"] ){
        addToCartMoved = @"0";
         CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
        CGRect newFrame = addToCartBlock.frame;
        _mainViewHeightConstraint.constant -= keyboardSize.height - 50;
        
        
    }
    
}

- (void)keyboardWasShown:(NSNotification *)notification {

if([addToCartMoved isEqualToString:@"0"]){

addToCartMoved = @"1";

CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

CGRect newFrame = addToCartBlock.frame;

_mainViewHeightConstraint.constant += keyboardSize.height + 50;

}

- (void)keyboardWillBeHidden:(NSNotification *)notification {

if([addToCartMoved isEqualToString:@"1"] ){

addToCartMoved = @"0";

CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

CGRect newFrame = addToCartBlock.frame;

_mainViewHeightConstraint.constant -= keyboardSize.height - 50;

}

4: Now keyboard Height will always return the correct value and now you can use according to their need.

kunal prasad 25 October 2021

. . .

1 comments

kevin van Dec 28, 2018 at 8:29 pm

Hi, I use the exact same methods as you did. However, I find that when I test my app in iPad4，I touch the textfield and hide my keyboard and touch the same textfield again, “keyboardSize.height” is wrong.

Fix Keyboard Related issue in iOS 11 using objective C

Fix Keyboard Related issue in iOS 11

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