There are some techniques to resize UITextView with respect to the keyboard.
Add a UITextView inside a UITableViewCell and adjust the cell’s size, so that UITextView will also be resized
Add a UITextView to the UIViewController (or a subclass of it) and resize the UITextView itself
But I’ve used non of the above in my upcoming app. I’ve found a tweaked version of the second technique.
Don’t resize the UITextView
Instead adjust its contentInset property. So that, you can have a UITextView that seems like adjusting its size.
This technique also comes with a very useful benefit that I was thinking ways to solve it. Assume that you are resizing UITextView every time keyboard is shown or hidden. When you assign a pattern image or color to UITextView as background color, keyboard animation causes UITextView to adjust its size improperly during its animation. And this lets the super view of UITextView to say ‘Hello!’ between UITextView and the keyboard. (At the second thought, I figured out that we can fix this animation stuff with providing a UIViewAnimationCurve to UIView's animate methods.)
But by adjusting only contentInset of UITextView, you no longer need to think about it!
Talk is cheap, show me the code
Firstly, as you know, we need to add our lovely UIViewController (or probably a subclass of it) as observer of keyboard notifications:
// Register for keyboard notifications [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
Then our keyboard notification handler methods:
#pragma mark - Notifications - (void)keyboardWillShow:(NSNotification *)note { CGRect keyboardFrame = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue]; UIEdgeInsets contentInset = self.textView.contentInset; contentInset.bottom = CGRectGetHeight(keyboardFrame); self.textView.contentInset = contentInset; self.textView.scrollIndicatorInsets = contentInset; } - (void)keyboardWillHide:(NSNotification *)note { UIEdgeInsets contentInset = self.textView.contentInset; contentInset.bottom = 0.0; self.textView.contentInset = contentInset; self.textView.scrollIndicatorInsets = contentInset; }
Alternatively, you can add this piece of code to - keyboardWillShow: method to make text view auto scroll to current cursor location:
NSTimeInterval animationDuration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; CGRect caretFrame = [self.textView caretRectForPosition:self.textView.selectedTextRange.start]; [UIView animateWithDuration:animationDuration animations:^{ [self.textView scrollRectToVisible:caretFrame animated:NO]; }];
There is a problem with UIScrollView’s (and its subviews’) - scrollRectToVisible:animated: method. If you pass YES to animate the scrolling, it won’t scroll a pixel at all. So, I found a workaround to force it to animate with UIView’s animate method.
If you find some bugs, have suggestions, or any other stuff, feel free to drop a line!
Credit: http://stackoverflow.com/a/21794968/1931781
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