使用到NSAttributedString
通过它就可以设置加载HTML。iOS7之后才可以使用：

- (nullableinstancetype)initWithData:(NSData *)dataoptions:(NSDictionary<NSString *, id> *)options
  documentAttributes:(NSDictionary<NSString *, id> * __nullable* __nullable)dict
  error:(NSError **)errorNS_AVAILABLE(10_0, 7_0);

其中，options中的指定key为:

UIKIT_EXTERN NSString * const NSDocumentTypeDocumentAttribute NS_AVAILABLE(10_0, 7_0);  

时，它可以选择的值有：

UIKIT_EXTERN NSString * const NSPlainTextDocumentType NS_AVAILABLE(10_0, 7_0);
UIKIT_EXTERN NSString * const NSRTFTextDocumentType NS_AVAILABLE(10_0, 7_0);
UIKIT_EXTERN NSString * const NSRTFDTextDocumentType NS_AVAILABLE(10_0, 7_0);
UIKIT_EXTERN NSString * const NSHTMLTextDocumentType NS_AVAILABLE(10_0, 7_0);

其中，NSHTMLTextDocumentType就是设置要加载HTML了。

NSData *data = [htmlString dataUsingEncoding:NSUnicodeStringEncoding];
NSDictionary *options = @{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType};
NSAttributedString *html = [[NSAttributedString alloc]initWithData:data
                                                            options:options
                                                 documentAttributes:nil
                                                              error:nil];
self.htmlLabel.attributedText = html;

其中会有一个小问题,就是填充到label中超出字符串后面"..."不显示了,查看富文本属性会看到,转化过程中自动填充了段落属性

PittWong长得帅！{
    NSColor = "kCGColorSpaceModelRGB 0 0 0 1 ";
    NSFont = "<UICTFont: 0x7f90d56a49b0> font-family: \"Times New Roman\"; font-weight: normal; font-style: normal; font-size: 12.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 15/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "kCGColorSpaceModelRGB 0 0 0 1 ";
    NSStrokeWidth = 0;
}他啦啦啦啦{
    NSColor = "kCGColorSpaceModelRGB 1 0 0 1 ";
    NSFont = "<UICTFont: 0x7f90d56a49b0> font-family: \"Times New Roman\"; font-weight: normal; font-style: normal; font-size: 12.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 15/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "kCGColorSpaceModelRGB 1 0 0 1 ";
    NSStrokeWidth = 0;
}

移除段落属性...就能正常显示了

NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithAttributedString: html];

[string removeAttribute:NSParagraphStyleAttributeName range: NSMakeRange(0, string.length)];