Question

UILabel中的行间距存在问题，我使用自定义字体，当我使用表情符号时，两行之间没有空格。这显然看起来不太好。所以我使用这个代码行间距，但app崩溃给出了错误

由于未捕获的异常终止应用程序＆＃39; NSInternalInconsistencyException＆＃39;，原因：＆＃39; NSAttributedString对于自动调整大小无效，它必须具有单个跨越段落样式（或无）以及非换行lineBreakMode。＆＃ 39;

if ([cell.label2 respondsToSelector:@selector(setAttributedText:)])
    {
        UIFont *font =btMyriadProRegularWithSize14Pt;

        NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
        [paragraphStyle setLineSpacing: 22];

        NSDictionary *attributes = @{ NSFontAttributeName: font, NSParagraphStyleAttributeName: paragraphStyle };
        NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:chatMessage.msgString attributes:attributes];

        [cell.label2 setAttributedText: attributedString];
    }
    else
    {
        NSString * msg = [NSString stringWithFormat:@"%@: %@",chatMessage.from,chatMessage.msgString];
        cell.label2.text = msg;
    }

Answer 1

试试这个

    [cell.label2 setAdjustsFontSizeToFitWidth:NO];

甚至可能仅适用于iOS 6

if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) { //*
       [cell.label2 setAdjustsFontSizeToFitWidth:NO];
}

按照此处所述检测iOS 6：https://developer.apple.com/library/ios/documentation/userexperience/conceptual/transitionguide/SupportingEarlieriOS.html

Answer 2

设置Attributable String

  NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
  [paragraph setLineBreakMode:NSLineBreakByWordWrapping];
  [paragraph setLineBreakMode:NSLineBreakByTruncatingTail];
  self.attrText = [[NSMutableAttributedString alloc] initWithString:text];
  [self.attrText addAttribute:NSParagraphStyleAttributeName value:paragraph range:NSMakeRange(0, text.length)];
  self.Text = text;

iOS 6多线标签行间距

2 个答案: