UITextView with scroll dynamically set resizes to default - ios

Question

I've implemented a ViewController that has a bottom UIView containing UITextView with scroll disabled that resizes as you type inside.
When the height of the text contained reaches 90 pixels, I enable scroll ->
scrollEnabled = YES;
What's supposed to happen: The UITextView and its superview should stay as the height that they were limited to (over the 90 pixel limit).
What happens: The UITextView resizes back to its default value.
More Info:
I'm using the code of Multiline UITextField as my bottom view.
I'm using iOS7.
Any help is appreciated, thank you.
EDIT: my code:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
self.textBox.scrollEnabled = NO;
self.textBox.font = [UIFont fontWithName:#"Helvetica" size:14];
[self registerForKeyboardNotifications];
}
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWasShown:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector: #selector(keyPressed:)
name: UITextViewTextDidChangeNotification
object: nil];
}
- (void)keyboardWasShown:(NSNotification *)notification
{
NSDictionary *info = [notification userInfo];
CGSize kbSize = [info[UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
[self setViewMovedUp:YES byHeight:kbSize.height];
}
- (void)keyboardWillHide:(NSNotification *)notification
{
NSDictionary *info = [notification userInfo];
CGSize kbSize = [info[UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
[self setViewMovedUp:NO byHeight:kbSize.height];
}
- (void)keyPressed:(id)sender
{
CGRect textRect = [self.textBox.text boundingRectWithSize:CGSizeMake(255,MAXFLOAT)
options:(NSStringDrawingUsesLineFragmentOrigin)
attributes:#{NSFontAttributeName : [UIFont fontWithName:#"Helvetica" size:14]}
context:nil];
NSInteger newSizeH = textRect.size.height;
if (self.textBox.hasText) {
// if the height of our new chatbox is
// below 90 we can set the height
if (newSizeH <= 90) {
self.textBox.scrollEnabled = NO;
[self.textBox scrollRectToVisible:CGRectMake(0,0,1,1)
animated:NO];
// chatbox
CGRect chatBoxFrame = self.textBox.frame;
chatBoxFrame.size.height = newSizeH + 12;
self.textBox.frame = chatBoxFrame;
// form view
CGRect formFrame = self.commentBox.frame;
formFrame.size.height = 30 + newSizeH;
self.commentBox.frame = formFrame;
}
// if our new height is greater than 90
// sets not set the height or move things
// around and enable scrolling
if (newSizeH > 90) {
self.textBox.scrollEnabled = YES;
CGRect frame = self.textBox.frame;
frame.size.height = 102;
self.textBox.frame = frame;
CGRect formFrame = self.commentBox.frame;
formFrame.size.height = 30 + 90;
self.commentBox.frame = formFrame;
}
}
}
- (void)setViewMovedUp:(BOOL)movedUp byHeight:(CGFloat)height
{
int movement = movedUp ? -height : height;
[UIView animateWithDuration:0.3
animations:^{
self.dataView.frame = CGRectOffset(self.dataView.frame, 0.0, movement);
}];
}

Answer 1

Although I am a little late, but just incase.
I faced the same problem myself. The text view came back to the original size on scroll. The way I resolved it was to update the height constraint on the UITextView.
That is each time you update the size of the UITextView, you also need to update the corresponding constraints.

Answer 2

Here is code that I use in iOS 6 and 7.
#pragma mark - UITextViewDelegate
- (void)textViewDidChange:(UITextView *)textView {
// I set _maxTextViewHeight based on device, but you can harcode it to 90
CGSize size = [textView sizeThatFits:CGSizeMake(textView.frame.size.width, _maxTextViewHeight)];
float desiredTextViewHeight = size.height - 7.5;
float desiredInputViewHeight = MIN(desiredTextViewHeight + 16.0f, _maxInputViewHeight);
textView.scrollEnabled = (desiredInputViewHeight == _maxInputViewHeight);
NSRange bottom = NSMakeRange([textView.text length] - 1, 1);
[textView scrollRangeToVisible:bottom];
CGRect inputViewFrame = _inputView.frame;
float heightDelta = desiredInputViewHeight - inputViewFrame.size.height;
inputViewFrame.size.height = desiredInputViewHeight;
inputViewFrame.origin.y -= heightDelta;
if (heightDelta != 0) {
[UIView animateWithDuration:0.1 animations:^{
_inputView.frame = inputViewFrame;
} completion:nil];
}
}
Also you can take a look onto this project https://github.com/jessesquires/MessagesTableViewController