When the number of text lines excels the maxNumberOfLines， the text view will scroll the top then bottom quickly, just like a flash

[shayanbo]

When the number of text lines excels the maxNumberOfLines， the text view will scroll the top then bottom quickly, just like a flash

[rajatk]

i'm seeing this issue. It's especially prominent when using in tableviewcell. on reload, the textview shows top part for a quick second then jumps to bottom.

[HaloZero]

If you want a quick fix, you can turn off animation.

[Shahar2k5]

@HaloZero , i turned the animation off like that:
messageField.animateHeightChange = NO; //turns off animation
but still....
anything else i need to do?

Tx.

[HaloZero]

I don't believe so, are you still getting the bug?

[Shahar2k5]

Yeah, still the same.
On the simulator, work OK.
On the iPad the bug exist.

[tsaisean]

I found this issue on iPhone6/6+, too.
The HPTextViewInternal.contentSize.height behaves strangely.

[truculent]

fix this method with :

   - (CGFloat)measureHeight
   {
      if ([self respondsToSelector:@selector(snapshotViewAfterScreenUpdates:)])
      {
        // This is the code for iOS 7. contentSize no longer returns the correct value, so
        // we have to calculate it.
        //
        // This is partly borrowed from HPGrowingTextView, but I've replaced the
        // magic fudge factors with the calculated values (having worked out where
        // they came from)

        CGRect frame = self.internalTextView.bounds;

        // Take account of the padding added around the text.

        UIEdgeInsets textContainerInsets = self.internalTextView.textContainerInset;
        UIEdgeInsets contentInsets = self.internalTextView.contentInset;

        CGFloat leftRightPadding = textContainerInsets.left + textContainerInsets.right + self.internalTextView.textContainer.lineFragmentPadding * 2 + contentInsets.left + contentInsets.right;
        CGFloat topBottomPadding = textContainerInsets.top + textContainerInsets.bottom + contentInsets.top + contentInsets.bottom;

        frame.size.width -= leftRightPadding;
        frame.size.height -= topBottomPadding;

        NSString *textToMeasure = self.internalTextView.text;
        if ([textToMeasure hasSuffix:@"\n"])
        {
            textToMeasure = [NSString stringWithFormat:@"%@-", self.internalTextView.text];
        }

        // NSString class method: boundingRectWithSize:options:attributes:context is
        // available only on ios7.0 sdk.

        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineBreakMode:NSLineBreakByWordWrapping];

        NSDictionary *attributes = @{ NSFontAttributeName: self.font, NSParagraphStyleAttributeName : paragraphStyle };

        CGRect size = [textToMeasure boundingRectWithSize:CGSizeMake(CGRectGetWidth(frame), MAXFLOAT)
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                               attributes:attributes
                                                  context:nil];

        CGFloat measuredHeight = ceilf(CGRectGetHeight(size) + topBottomPadding);
        return measuredHeight;
       }
       else
       {
           return self.internalTextView.contentSize.height;
       }
   }

[ghost]

thx truculent! Great fix.