Clash Royale CLAN TAG#URR8PPP

Wrong bounding rect for right aligned text in UILabel

- (CGRect)boundingRectForGlyphRange:(NSRange)glyphRange inTextContainer:(NSTextContainer *)container;


returns wrong rect for glyph range when attributed text is right aligned in UILabel. How to fix this please ?

Code to calculate the bounding rect of attributed text when tapped on UILabel (textAlignment set to right in UILabel)

- (void)tap:(UITapGestureRecognizer *)recognizer
UILabel *label = (UILabel *)recognizer.view;
CGSize labelSize = recognizer.view.bounds.size;

NSTextContainer *container = [[NSTextContainer alloc] initWithSize:labelSize];
container.lineFragmentPadding = 0.0;
container.lineBreakMode = label.lineBreakMode;
container.maximumNumberOfLines = label.numberOfLines;

NSLayoutManager *manager = [NSLayoutManager new];
[manager addTextContainer:container];

NSTextStorage *storage = [[NSTextStorage alloc] initWithAttributedString:label.attributedText];
[storage addLayoutManager:manager];

CGPoint touchPoint = [recognizer locationInView:label];
NSInteger indexOfCharacter = [manager characterIndexForPoint:touchPoint
inTextContainer:container
fractionOfDistanceBetweenInsertionPoints:nil];

NSRange range = NSMakeRange(indexOfCharacter, 1);
NSRange glyphRange;
[manager characterRangeForGlyphRange:range actualGlyphRange:&glyphRange];
CGRect rect = [manager boundingRectForGlyphRange:glyphRange inTextContainer:container];



label.attributedText

2 Answers
2

The problem is that you are setting the label's text and textAlignment, and then pulling out the label's attributedText and handing it to the text kit stack, in the belief that it magically translates your label configuration into an attributed string. It doesn't!

text

textAlignment

attributedText

If you want right-aligned text that the text kit stack can see as right-aligned, set your label's attributedText only, endowing it with features such as a right-aligned paragraph style.

attributedText

Solved this!!

The problem was the label was made to be right aligned using textAlignment property of UILabel. As mentioned in comments label.attributedText doesn't know anything about it.

textAlignment

label.attributedText

Instead add text alignment using NSParagraphStyleAttributeName as :

NSParagraphStyleAttributeName

NSMutableAttributedString *mutableString = [NSMutableAttributedString new];
//Add to your string
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setAlignment:NSTextAlignmentRight];
[mutableString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, mutableString.length)];
label.attributedText = mutableString;


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.