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UIScrollView do not scroll down to its original position when keyboard disappear


UIScrollView do not scroll down to its original position when keyboard disappear

By : Bill Spitler
Date : November 19 2020, 03:01 PM
like below fixes the issue I have found the solution. Actually the concept behind scrollview was not clear to me. But now it is clear and change in one line only made the trick.
code :
- (void)keyboardWillHide:(NSNotification *)notification {
    NSDictionary* info = [notification userInfo];
    kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    CGRect commentViewFrame = self.detailCommentView.frame;
    commentViewFrame.origin.y += kbSize.height;

    [UIView animateWithDuration:0.3 animations:^{
        [self.detailCommentView setFrame:commentViewFrame];
        self.scrollView.contentOffset = CGPointMake(0, 0);
    } completion:^(BOOL finished) {
    }];
}


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How do I scroll the UIScrollView when the keyboard appears?

How do I scroll the UIScrollView when the keyboard appears?


By : Sabreen.S
Date : March 29 2020, 07:55 AM
hop of those help? The recommended way from Apple is to change the contentInset of the UIScrollView. It is a very elegant solution, because you do not have to mess with the contentSize. Following code is copied from the Keyboard Programming Guide, where the handling of this issue is explained. You should have a look into it.
code :
// 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];
}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your application might not need or want this behavior.
    CGRect aRect = self.view.frame;
    aRect.size.height -= kbSize.height;
    if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {
        CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y-kbSize.height);
        [scrollView setContentOffset:scrollPoint animated:YES];
    }
}

// Called when the UIKeyboardWillHideNotification is sent    
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;
}
func registerForKeyboardNotifications() {
    NotificationCenter.default.addObserver(self, selector: #selector(onKeyboardAppear(_:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(onKeyboardDisappear(_:)), name: NSNotification.Name.UIKeyboardDidHide, object: nil)
}

// Don't forget to unregister when done
deinit {
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardDidShow, object: nil)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardDidHide, object: nil)
}

@objc func onKeyboardAppear(_ notification: NSNotification) {
    let info = notification.userInfo!
    let rect: CGRect = info[UIKeyboardFrameBeginUserInfoKey] as! CGRect
    let kbSize = rect.size

    let insets = UIEdgeInsetsMake(0, 0, kbSize.height, 0)
    scrollView.contentInset = insets
    scrollView.scrollIndicatorInsets = insets

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your application might not need or want this behavior.
    var aRect = self.view.frame;
    aRect.size.height -= kbSize.height;

    let activeField: UITextField? = [addressTextView, servicePathTextView, usernameTextView, passwordTextView].first { $0.isFirstResponder }
    if let activeField = activeField {
        if !aRect.contains(activeField.frame.origin) {
            let scrollPoint = CGPoint(x: 0, y: activeField.frame.origin.y-kbSize.height)
            scrollView.setContentOffset(scrollPoint, animated: true)
        }
    }
}

@objc func onKeyboardDisappear(_ notification: NSNotification) {
    scrollView.contentInset = UIEdgeInsets.zero
    scrollView.scrollIndicatorInsets = UIEdgeInsets.zero
}
UIScrollView scroll up on Keyboard

UIScrollView scroll up on Keyboard


By : Majeed Kocher Duhok
Date : March 29 2020, 07:55 AM
With these it helps Problem Statement : I have Nib file of UIView contains UIScrollview, In scrollview I have several TextFields and a TextView at the Bottom. What I want is to scroll upward when textfield or Textview starts editing. , Replace keyboardWasShown function with the below function :
code :
 func keyboardWasShown(notification: NSNotification)
{
    var userInfo = notification.userInfo!
    var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
    keyboardFrame = self.convert(keyboardFrame, from: nil)
    self.mainScroll.contentOffset = CGPoint(x: 0, y: keyboardFrame.size.height - Any number that fits your need.)
}
self.mainScroll.contentOffset = CGPoint(x: 0, y: 0)
UIScrollView scroll to button when keyboard is visible

UIScrollView scroll to button when keyboard is visible


By : Bosko M.
Date : March 29 2020, 07:55 AM
this will help I got a pretty basic login form in my iOS application. The typical behavior I normally implement ist registering for the keyboard notifications and handling the scroll behavior of the UIScrollView in order to show the currently focused UITextField. However this time I need a slightly different behavior. , Did you try it the following way?
code :
func keyboardWillShow(notification: Notification) {
    self.scrollView.isScrollEnabled = true
    let contentInsets = UIEdgeInsetsMake(0.0, 0.0, self.keyboardSize.height, 0.0)
    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    var rect = self.view.frame
    rect.size.height -= self.keyboardSize.height
    if !rect.contains(self.loginButton.frame.origin) {
        self.scrollView.scrollRectToVisible(self.loginButton.frame, animated: true)
    }
}
How to decide which UIScrollView to scroll when showing keyboard

How to decide which UIScrollView to scroll when showing keyboard


By : denisse og
Date : March 29 2020, 07:55 AM
I wish this helpful for you You should register for keyboard notification, I don't know if it would fix the problem but take a look here:Apple doc about keyboard.
I this way you will be able to scroll the scrollview with the keyboard on screen, but I guess that the webview will respond too, since it's already registered for keyboard notification, maybe you could also rescroll it listening to this kind of notification.
Why UIScrollView doesn't scroll when keyboard is shown?

Why UIScrollView doesn't scroll when keyboard is shown?


By : user5118305
Date : March 29 2020, 07:55 AM
it fixes the issue i had this problem when i had a scroll view in storyboard with AutoLayout , the problem is that UIScrollView with AutoLayout doesn't know its content size even if you set its content size programmatically , its content size is inferred from the constraints applied to its content views , and it can be quite messy if you have many subviews in the scroll view content , so i solved the problem by adding all subviews in the scrollview to a root view and add this root view as the content of my scroll view , and of course pin top , left , bottom , right , width and height of this root view to the scrollview , this way the scrollview knows its content view's size exactly , here is a technical note issued by apple about this problem https://developer.apple.com/library/ios/technotes/tn2154/_index.html
hope this helps !
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