ios - NSAttributedString 删除线使我的属性文本消失

Question

我正在尝试制作带有删除线的属性字符串。我可以设置其他属性，例如前景色和字体大小，但是当我尝试在部分文本中设置删除线时，该部分文本消失了。知道是什么原因造成的吗？

下面是代码。感谢您的关注!

// ...    
    //Price
    NSLog(@"RESULT NUMBER %d", cell.result.resultId);
    priceString = (priceString == nil) ? @"$150.00\n$100.00" : priceString;
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:priceString];
    NSRange linebreak = [priceString rangeOfString:@"\n"];



    if (linebreak.location != NSNotFound) {
        [attributedString beginEditing];
        // RegPrice
        NSRange firstLine = NSMakeRange(0, linebreak.location);
//        [attributedString addAttribute:NSFontAttributeName
//                                 value:[UIFont boldSystemFontOfSize:11]
//                                 range:firstLine];
        [attributedString addAttribute:NSForegroundColorAttributeName
                                 value:[UIColor colorWithRed:0.7 green:0.7 blue:0.7 alpha:1]
                                 range:firstLine];
        @try {
            [attributedString addAttribute:NSStrikethroughStyleAttributeName
                                     value:@(NSUnderlineStyleSingle)
                                     range:firstLine];
        } @catch (NSException *e) {
            NSLog(@"ATTRIBUTE EXCEPTION: %@", e);
        }

        // Sale Price
        [attributedString addAttribute:NSFontAttributeName
                                 value:[UIFont boldSystemFontOfSize:14]
                                 range:NSMakeRange(linebreak.location + 1, priceString.length - (linebreak.location + 1))];
        [attributedString endEditing];
    }
    cell.lblPrice.attributedText = attributedString;

    return cell;
}

Answer 1

我遇到了同样的字符串消失问题，直到我意识到 NSStrikethroughStyleAttributeName 的值应该是一个 NSNumber。

因此上面的代码应该是这样的:

objective-c

[attributedString addAttribute:NSStrikethroughStyleAttributeName 
                         value: [NSNumber numberWithInt: NSUnderlineStyleSingle] 
                         range:firstLine];

在 Swift 4 中，属性是使用 [NSAttributedStringKey: Any] 类型的字典传递的，strike trough style 属性看起来像这样:

[NSAttributedStringKey.strikethroughStyle: NSNumber(value: NSUnderlineStyle.styleSingle.rawValue)]