Scrolling Issue in UITextview in iOS - Glitch and Auto-Scroll Behavior

Question

Problem Description

I am currently working on an iOS project (for iPad) using Objective-C, and I've encountered a vexing issue with a UITextview. I'm hoping someone can help me troubleshoot this issue.

Reproduction Steps

To replicate the problem, follow these steps:

1. Load a UITextview with a significant amount of content, more than 2000 lines.
2. Begin scrolling from the bottom to the top, doing so slowly.
3. After scrolling through 300-400 lines, a glitch occurs in the scroll behavior.
4. The view automatically scrolls all the way to the bottom, leaving extra space at the bottom.

Actual Behavior

• The issue I'm facing is described in the reproduction steps. This behavior is inconsistent and problematic for my users.
• When scrolling from top to bottom, there are no issues; the behavior is as expected.
• Scrolling with medium and high speed also works as intended.
• Despite the auto-scroll, the scroll indicator remains at the initial position (for few seconds) where I left it.

UI Implementation

• I added a UITextview to a ViewController’s UIView.
• I've set the constraints for the UITextview to pin it to all four sides (leading, trailing, top, and bottom) of its parent UIView.

The UI layout itself appears to be correctly configured, but I'm experiencing unexpected scroll behavior as described in the "Actual Behavior" section.

Expected Behavior

I expected the UITextview to smoothly scroll from bottom to top, allowing me to read and interact with the content without any glitches or auto-scrolling behavior.

Additional Information

• iOS version: Tested in iPad device (iOS 17), iPad Simulator (iOS 15, iOS 16, iOS 17)
• Xcode version: 15.0

I would greatly appreciate any guidance or assistance in troubleshooting and resolving this scrolling issue in the UITextview. Thanks in advance for your help!