UILabel上面展示html格式文本

搜集的一些小方法
html格式 转富文本，已测过

NSAttributedString *attString =  [[NSAttributedString alloc] initWithData:[string dataUsingEncoding:NSUnicodeStringEncoding]      options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType}  documentAttributes:nil  error:nil];

此时在需要计算文字自适应高度的话

CGSize size = [attString boundingRectWithSize:CGSizeMake(SCREEN_WIDTH-24, 30) options:NSStringDrawingUsesLineFragmentOrigin  context:nil].size;

富文本转字符串,未亲测

NSDictionary *tempDic = @{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute:[NSNumber numberWithInt:NSUTF8StringEncoding]}; NSData *htmlData = [attri dataFromRange:NSMakeRange(0, attri.length) documentAttributes:tempDic error:nil];
NSString *string = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];