Scroll UITextView To Bottom

Question

I am making a an app that has a UITextView and a button.

When I click the button some text will add in the UITextView.

But when clicking the button, I wan't to scroll down to the bottom of the text field so the user can see the last text added.

How to make the UITextView to scroll down to the bottom?

I tried:

int numLines = LogTextView.contentSize.height / LogTextView.font.lineHeight+1;
NSLog(@"%d",numLines);

NSUInteger length = self.LogTextView.text.length;
self.LogTextView.selectedRange = NSMakeRange(0, length);

but it will not work...

I also tried:

self.LogTextView.contentSize=CGSizeMake(length,0);

First of all is text view because a UITextView, because the text field doesn't have a scroll. ;) And maybe you could use scrollRangeToVisible method :) — danypata
– danypata, Commented May 22, 2013 at 18:02
as @danypata questioned, is this a uitextview, or a uitextfield in a uiscrollview? you referenced both text field and text view in the question. — user712376
– user712376, Commented May 22, 2013 at 18:08
@andrewlattis the question is about UITextView which is a sub of UIScrollView which has contentSize as a property. — Dan Rosenstark
– Dan Rosenstark, Commented Apr 19, 2016 at 19:36

andym · Accepted Answer · 2018-05-19 22:47:32Z

87

You can use the following code if you are talking about UITextView:

-(void)scrollTextViewToBottom:(UITextView *)textView {
     if(textView.text.length > 0 ) {
        NSRange bottom = NSMakeRange(textView.text.length -1, 1);
        [textView scrollRangeToVisible:bottom];
     }

}

SWIFT 4:

func scrollTextViewToBottom(textView: UITextView) {
    if textView.text.count > 0 {
        let location = textView.text.count - 1
        let bottom = NSMakeRange(location, 1)
        textView.scrollRangeToVisible(bottom)
    }
}

edited May 19, 2018 at 22:47

andym

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answered May 22, 2013 at 18:09

danypata

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4 Comments

Ofir Malachi Over a year ago

DON'T FORGET TO ADD [textView setScrollEnabled:NO]; [textView setScrollEnabled:YES];

stuckj Over a year ago

@ofirmalachi, did you mean to write conflicting statements in your comment above?

Bawenang Rukmoko Pardian Putra Over a year ago

@stuckj I think what he meant what disable scrolling when it is still scrolling down and the enable it again after it is finished. CMIIW.

schmidt9 Over a year ago

Note using scrollRangeToVisible with large texts may make UITextView freeze because of animation. Better use contentOffset as shown here stackoverflow.com/a/42478029/3004003, but set animated to false

Community · Accepted Answer · 2017-05-23 12:17:54Z

19

Try this if you have problem on iOS 7 or above. See this SO answer.

- (void)scrollTextViewToBottom:(UITextView *)textView {
    NSRange range = NSMakeRange(textView.text.length, 0);
    [textView scrollRangeToVisible:range];
    // an iOS bug, see https://stackoverflow.com/a/20989956/971070
    [textView setScrollEnabled:NO];
    [textView setScrollEnabled:YES];
}

edited May 23, 2017 at 12:17

CommunityBot

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answered Oct 18, 2015 at 5:09

Hong Duan

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1 Comment

Mohamed Salah Over a year ago

IOS 13 and the bug is still here!

zeeawan · Accepted Answer · 2017-02-27 04:51:51Z

12

With Swift 3

let bottom = self.textView.contentSize.height - self.textView.bounds.size.height
self.textView.setContentOffset(CGPoint(x: 0, y: bottom), animated: true)

answered Feb 27, 2017 at 4:51

zeeawan

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5 Comments

zeeawan Over a year ago

It should work. Where are you using this code? Make sure you're using it after textView has been loaded.

xaphod Over a year ago

It's after viewDidAppear, and textview is fully loaded, with content. Might be related to the fact that the textview's content is larger than the screen's bounds by a large margin

zeeawan Over a year ago

I've just re-verified and it's working just fine. I've created a new single view project, drag and drop a textView with default size and default text, connected outlet, put this code inside viewDidAppear. And it correctly scrolled to bottom.

Ruslan Mansurov Over a year ago

It's better to add check if bottom positive or not, because if it is negative then there is no need to change contentOffset.

neoneye Over a year ago

Doesn't work for me (iOS11). My text spans many lines and uses a custom font.

neoneye · Accepted Answer · 2020-07-18 05:17:53Z

7

Swift 5

extension UITextView {
    func simple_scrollToBottom() {
        let textCount: Int = text.count
        guard textCount >= 1 else { return }
        scrollRangeToVisible(NSRange(location: textCount - 1, length: 1))
    }
}

// Usage
textView.simple_scrollToBottom()

edited Jul 18, 2020 at 5:17

answered Feb 27, 2018 at 10:22

neoneye

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4 Comments

David_2877 Over a year ago

Excellent recommendation! Works really well. Placed the extension at bottom of code after class } and then used the //Usage. code in the button Action.

AMAN77 Over a year ago

change this for swift 5 scrollRangeToVisible(NSRange(location: textCount - 1, length: 1))

neoneye Over a year ago

Thanks @AMAN77 I have inserted your changes.

Fa.Shapouri Over a year ago

It is need to be called by delay after set text

Chris Amelinckx · Accepted Answer · 2021-03-17 03:53:12Z

5

Make a range, specifying encoding, to the last character, then scroll to that range Something other than utf8 might be appropriate depending on your content

let range = NSMakeRange(self.textView.text.lengthOfBytes(using: .utf8), 0);
self.textView.scrollRangeToVisible(range);

edited Mar 17, 2021 at 3:53

answered Jun 21, 2017 at 2:28

Chris Amelinckx

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2 Comments

Daniele Ceglia Over a year ago

The best solution of all with the minimum lag!

Radu Ursache Over a year ago

this works on iOS 14.4 as well. smooth and no issues at all

thesquaregroot · Accepted Answer · 2018-01-17 01:46:11Z

4

You have to implement a delegate method. The code below checks whether a newline has been entered and, if so, scrolls to the bottom of the textView:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{

    if ([text isEqualToString:@"\n"]) {
        textView.contentOffset = CGPointMake(0.0, textView.contentSize.height);
    }
    return YES;
}

edited Jan 17, 2018 at 1:46

thesquaregroot

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answered Feb 4, 2014 at 12:33

wolffan

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Comments

Kevin Chen · Accepted Answer · 2014-08-11 17:15:58Z

3

This works for me! :D

CGPoint bottomOffset = CGPointMake(0, self.textView.contentSize.height - self.textView.bounds.size.height);
[self.description1 setContentOffset:bottomOffset animated:YES];

edited Aug 11, 2014 at 17:15

Kevin Chen

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answered Jan 19, 2014 at 19:50

Brandon Boynton

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1 Comment

David Lawson Over a year ago

This works well for when you need to do this without animation (with animated:NO of course). Note that you might want to add in a max(0, ... to scroll down only when necessary.

Pablo Sanchez Gomez · Accepted Answer · 2020-02-13 19:23:35Z

3

As a generic approach for scrolling to bottom, it can be done on a UIScrollView.

extension UIScrollView {
    func scrollToBottom() {
        let contentHeight = contentSize.height - frame.size.height
        let contentoffsetY = max(contentHeight, 0)
        setContentOffset(CGPoint(x: 0, y: contentoffsetY), animated: true)
    }
}

This will work on all descendants of UIScrollView like UITextView, UITableView etc..

edited Feb 13, 2020 at 19:23

Pablo Sanchez Gomez

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answered Jan 28, 2018 at 17:34

ArunGJ

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Comments

Nathan Hosselton · Accepted Answer · 2020-03-12 18:15:54Z

3

textView.scrollRangeToVisible(NSRange(..<textView.text.endIndex, in: textView.text))

This solution does a couple of notable things slightly different:

Utilizes the String.Index interface (likely more performant than e.g. .count)
Uses a PartialRangeUpTo which avoids an explicit range start position, reducing the code to a clean one-liner

edited Mar 12, 2020 at 18:15

answered Jan 10, 2020 at 20:28

Nathan Hosselton

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Comments

yoAlex5 · Accepted Answer · 2019-09-19 14:01:42Z

1

The Swift version of @Hong Duan answer

func scrollTextViewToBottom(textView: UITextView) {
    if textView.text.count > 0 {
        let location = textView.text.count - 1
        let bottom = NSMakeRange(location, 1)
        textView.scrollRangeToVisible(bottom)

        // an iOS bug, see https://stackoverflow.com/a/20989956/971070
        textView.isScrollEnabled = false
        textView.isScrollEnabled = true
    }
}

answered Sep 19, 2019 at 14:01

yoAlex5

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