Scroll to bottom of UITextView erratic in iOS 7

Question

The following code will work fine in iOS < 7.0. In iOS 7 the scrolling will be choppy and erratic while the UITextView is updating. I\'m not sure if this is a bug in iO

Answer 1

Try this:

// Don't forget to set textView's delegate 
-(void)textViewDidChangeSelection:(UITextView *)textView {
    [textView scrollRangeToVisible:NSMakeRange([textView.text length], 0)];
}

Answer 2

please try this solution

-(void) scrollToBottom {
    [textView setContentOffset:CGPointMake(0.0, textView.contentSize.height) animated:YES];
}

Answer 3

There are two problems in iOS 7 that could explain your problem:

• The contentOffset is not always up to date in iOS 7.
• scrollRangeToVisible: will not scroll to an empty line at the end of the text view.

The solution could be:

-(void)scrollOutputToBottom {
    CGRect caretRect = [textView caretRectForPosition:textView.endOfDocument];
    [textView scrollRectToVisible:caretRect animated:NO];
}

Answer 4

This is obviously an iOS 7 bug. Here is a workaround until apple fixes it. The workaround is basically instantiates a UITextView by creating an NSTextStorage and NSLayoutManager from scratch. Apple must have forgotten to initialize something in UITextView initialization method. I filed a bug report and I hope you do too.

// ios7 bug fix
// check if the device is running iOS 7.0 or later
NSString *reqSysVer = @"7.0";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
BOOL osVersionSupported = ([currSysVer compare:reqSysVer  options:NSNumericSearch] != NSOrderedAscending);

if (osVersionSupported) {
    NSTextStorage* textStorage = [[NSTextStorage alloc] init];
    NSLayoutManager* layoutManager = [NSLayoutManager new];
    [textStorage addLayoutManager:layoutManager];
    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:self.view.bounds.size];
    [layoutManager addTextContainer:textContainer];
    yourTextView = [[UITextView alloc] initWithFrame:someFrameForYourTextView
                                       textContainer:textContainer];
    // if using ARC, remove these 3 lines
    [textContainer release];
    [layoutManager release];
    [textStorage release];
}
else {
    yourTextView = [[UITextView alloc] initWithFrame:someFrameForYourTextView];
}

Answer 5

This works for me in iOS7.

-(void) scrollToBottom {
  [textView scrollRangeToVisible:NSMakeRange([textView.text length], 0)];
  [textView setScrollEnabled:NO];
  [textView setScrollEnabled:YES];
}

Answer 6

That works for me. Reference: UITextView setText should not jump to top in ios8

self.textView.layoutManager.allowsNonContiguousLayout = NO;
self.textView.text = fileContent;
if(fileContent.length > 1)
{
    NSRange range = NSMakeRange(self.textView.text.length - 1, 1);
    [self.textView scrollRangeToVisible:range];
}