计算富文本的高度

1.设置富文本

- (CGFloat)textHeight :(NSString *)content{
    NSString *text = [CustomMethod transformString:content emojiDic:emojiDic];
    
    text = [NSString stringWithFormat:@"<font color='black' strokeColor='gray' face='Palatino-Roman'>%@",text];
    MarkupParser *wk_markupParser = [[MarkupParser alloc] init];
    NSMutableAttributedString* attString = [wk_markupParser attrStringFromMarkup: text];
    [attString setFont:[UIFont systemFontOfSize:16]];
    
　　//设置文本的行高
    CGFloat lineSpacing = 7.0;
    CTParagraphStyleSetting paragraphStyles[9] = {
        {.spec = kCTParagraphStyleSpecifierLineSpacing, .valueSize = sizeof(CGFloat), .value = (const void *)&lineSpacing}
    };
    CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(paragraphStyles, 9);
    NSMutableDictionary * mutableAttributes = [NSMutableDictionary dictionary];
    [mutableAttributes setObject:(id)paragraphStyle forKey:(NSString *)kCTParagraphStyleAttributeName];
    CFRelease(paragraphStyle);
    NSDictionary* attDic = [NSDictionary dictionaryWithDictionary:mutableAttributes];
    [attString addAttributes: attDic range:NSMakeRange(0, [content length])];
    
    CGSize size=[CommonCore adjustSizeWithAttributedString:attString maxWidth:WIDTHWITH(200)];
    return  size.height;
    
}

2、计算高度

//计算富文本大小
+ (CGSize)adjustSizeWithAttributedString:(NSAttributedString *)attributedString maxWidth:(CGFloat)width {
    CTFramesetterRef framesetter =
    CTFramesetterCreateWithAttributedString((__bridge CFMutableAttributedStringRef)attributedString);
    
    CGSize maxSize = CGSizeMake(width, CGFLOAT_MAX);
    CGSize size = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, 0), NULL, maxSize, NULL);
    
    CFRelease(framesetter);
    
    return CGSizeMake(floor(size.width) + 1, floor(size.height) + 1);
}