Scroll to Bottom of Uitextview Erratic in iOS 7

Scroll to bottom of UITextView erratic in iOS 7

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];
}

Scroll UITextView To Bottom

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)
    }
}

UITextView setText should not jump to top in ios8

Try just to add text to UITextView (without scrollRangeToVisible/scrollEnabled). It seams that hack with scroll enabled/disabled is no more needed in iOS8 SDK. UITextView scrolls automatically.

iOS 7 - UITextView size font to fit all text into view (no scroll)

Solution 1

Your problem can be solved by simply replacing sizeWithFont: constrainedToSize: with :

boundingRectWithSize:CGSizeMake(newView.frame.size.width, FLT_MAX)
                options:NSStringDrawingUsesLineFragmentOrigin
             attributes:@{NSFontAttributeName:[UIFont fontWithName:@"Interstate" size:fontSize]}
                context:nil];

Solution 2

The sizeThatFits method can be used to address this problem like this:

while (fontSize > minSize &&  [newView sizeThatFits:(CGSizeMake(newView.frame.size.width, FLT_MAX))].height >= newView.frame.size.height ) {
    fontSize -= 1.0;
    newView.font = [tv.font fontWithSize:fontSize];
}

I hope one of these solutions solve your problem. Cheers!

UITextView cursor not positioning properly when editing in iOS 7. Why?

this bug is in iOS 7.0 you can solve this by modifying textView delegate method.

try below code

- (void)textViewDidChange:(UITextView *)textView {
    CGRect line = [textView caretRectForPosition:
        textView.selectedTextRange.start];
    CGFloat overflow = line.origin.y + line.size.height
        - ( textView.contentOffset.y + textView.bounds.size.height
        - textView.contentInset.bottom - textView.contentInset.top );
    if ( overflow > 0 ) {
    // We are at the bottom of the visible text and introduced a line feed, scroll down (iOS 7 does not do it)
    // Scroll caret to visible area
        CGPoint offset = textView.contentOffset;
        offset.y += overflow + 7; // leave 7 pixels margin
    // Cannot animate with setContentOffset:animated: or caret will not appear
        [UIView animateWithDuration:.2 animations:^{
            [textView setContentOffset:offset];
        }];
    }
}

your problem will solved.

How to make a UITextView scroll while typing/editing

Problems with other answers:

• when only scanning for "\n", if you type a line of text that exceeds the width of the text view, then scrolling will not occur.
• when always setting contentOffset in textViewDidChange:, if you edit the middle of the text you do not want to scroll to the bottom.

The solution is to add this to the text view delegate:

- (void)textViewDidChange:(UITextView *)textView {
    CGRect line = [textView caretRectForPosition:
        textView.selectedTextRange.start];
    CGFloat overflow = line.origin.y + line.size.height
        - ( textView.contentOffset.y + textView.bounds.size.height
        - textView.contentInset.bottom - textView.contentInset.top );
    if ( overflow > 0 ) {
        // We are at the bottom of the visible text and introduced a line feed, scroll down (iOS 7 does not do it)
        // Scroll caret to visible area
        CGPoint offset = textView.contentOffset;
        offset.y += overflow + 7; // leave 7 pixels margin
        // Cannot animate with setContentOffset:animated: or caret will not appear
        [UIView animateWithDuration:.2 animations:^{
            [textView setContentOffset:offset];
        }];
    }
}

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