How do I get UITextView to scroll properly when the keyboard is visible

Question

I have a UITextView sitting on top of a UIView, and if I tap on it to open it for editing, then the keyboard is blocking the bottom of the view and I can not see it even though I can write in this area. Can I tell the UITextView to have a different scroll area or what is the solution?

Answer 1

A better solution, specially for iOS 7, would be to adjust the content inset property of the textview instead of its frame, this way, the keyboard will blur the text that falls behinds it like in any other iOS 7 app. You'll also have to adjust the scroll indicators to match.

Expanding Lindemann's answer,

- (void)keyboardWasShown:(NSNotification*)notification {
    NSDictionary* info = [notification userInfo];
    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

    self.textView.contentInset = UIEdgeInsetsMake(0, 0, keyboardSize.height, 0);
    self.textView.scrollIndicatorInsets = self.textView.contentInset;
}

- (void)keyboardWillBeHidden:(NSNotification*)notification {
    self.textView.contentInset = UIEdgeInsetsZero;
    self.textView.scrollIndicatorInsets = UIEdgeInsetsZero;
}

Answer 2

An easy solution is to implement the UITextViewDelegate Methods

- (void)textViewDidBeginEditing:(UITextView *)textView

and

- (void)textViewDidEndEditing:(UITextView *)textView

You can make the UITextView Frame smaller when the keyboard appears and make it full size again when the keyboard disappears...like this:

- (void)textViewDidBeginEditing:(UITextView *)textView {
    self.textView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height/1.8);
}

- (void)textViewDidEndEditing:(UITextView *)textView {
    self.textView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}

EDIT

The solution above is bad...don't use it!!!

Now I think it's a better idea to resize the UITextView in proportion to the keyboard size and not with a fixed value...because the size of the keyboard can change when an other language become chosen or the device become rotated...of course -.-

At first you must register your UIViewController which displays your UITextView for receiving Keyboard Notifications:

- (void)viewDidLoad {
    [super viewDidLoad];

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

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

Then you have to implement the two methods -keyboardWasShown: and -keyboardWillBeHidden:.

The size of the actual keyboard is contained in the NSNotification object.

- (void)keyboardWasShown:(NSNotification*)notification {
    NSDictionary* info = [notification userInfo];
    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    self.textView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - keyboardSize.height);
}

- (void)keyboardWillBeHidden:(NSNotification*)notification {
    self.textView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}